How to merge 2 images together without using photoshop?

I want to know how people merge 2 images together, but most people tell me to use photoshop, which I'd rather not shell money out for.  Is there any other way to merge 2 images together? EDIT- so apparently people are thinking I want to merge 2 images together into some mumbo jumbo sh*t.  No.  THIS IS WHAT I WANT:

Asked by DJ Radio 7 years ago


How to merge two partitions?

Hi Right now I have 20GB for in drive C and 80GB in drive D, the space on drive C became low and I try to add some free space from D into it. But I heard that the it requires to delete drive D first. I just don't want to lose my data on drive D, all my applications and games installed in it!! How am I supposed to do?  Any suggestion would be much appreciated!  

Posted by Eden Derek 4 years ago


Can 2 accounts be merged together?

I recently realized that i have 2 seperate accounts that both have saved instructables that i dont want to lose. This was done by accident as i used F.B. to sign up on my phone and apparently my new email/gmail acct for my laptop...again, unintentionally.  Is there any way i can merge the 2 accounts into the 1 gmail acct. i wish to use..... SOMEONE SAVE ME!!!!!

Asked by jmissavage83 2 years ago


Merge?

Why are there two groups for musical instruments?

Posted by endolith 11 years ago


Merge?

Why are there two groups for musical instruments?

Posted by endolith 11 years ago


Digital pictures merged to holographic - like image?

A souvenir vendor took two digital pictures of me and my husband, merged them on a computer, printed the interleaved (?) image, then adhered a piece of acrylic with vertical lines (scratches?) to it.  The result is like a hologram in that you see the two different images as you tilt the (acrylic overlaid) photo. How can I make those?

Asked by abbychia 8 years ago


Can I merge the"arduino bluetooth robot" project with a " sound responding robot " project?

I would like to make a robot that follows the sound of a clap but when it finds an obstacle it stop and it waits for a commant from the phone.

Asked by ΜαρίναΤ 1 day ago





Rotary dialer in modern cell phone

I want to merge rotary dialer with a modern cell phone. Can anyone help me with this, please? Actually I have to convert rotary dialer's analog signals to cell phone's way of dialing -- key closing...

Posted by Blinchik 11 years ago


DIY DVD changer ?

 Anyone try merging mechanical parts from an old 200 disk cd changer with the electronics from a dvd player to make a 200 disk dvd changer?  I hate to throw out an obsolete cd changer w/o trying.

Asked by bizydad 8 years ago


instructables facebook account integration?

Hi folks! I have this account long before the facebook integration. Problem is that at somepoint, I created a second one with my integrated with my facebook account. Is there anyway I can merge both or at least delet the other one and integrate this one with facebook?

Asked by Yemerich 2 years ago


which hydroponic medium wicks the best?

out of the main hydro grow mediums which one wicks the best COCONUT COIR LECA PERLITE vermiculite I'm planning on making something similar to this type of pot merged/ hacked / frankenstined / macgivered with a wick system

Asked by furby 7 years ago


Fractal Snowflake Cupcakes

Evil Mad Scientist goes to the kitchen and again merges math with food. Their new sugary fractal creations are made with either fondant or marzipan. Check out their site for the full details on how to make one of these on your own. Fractal Snowflake Cupcakes

Posted by fungus amungus 9 years ago



Magic Wheel

The quest for the most ridiculous personal transportation continues with this bizarre merging of a rollerblade, a bicycle, and a penny farthing. If you want one you'll have to get it shipped from Singapore for $580 so if you really want to try it out I'd guess that you could make it for less than $50 worth of spare parts. Anyone interested? Link

Posted by fungus amungus 9 years ago


Unexpected icon?

Hey folks, I didn't see a topic on this (if there is one feel free to merge it with the appropriate thread). At any rate, this morning I logged on to instructables and found this icon of what appears to be a forearm hiding up by my name on my user page. I'm not entirely sure what it's for, but it seems a number of other members have the same thing. Attached is a picture of the image, so if somebody could please let me know what this is for that would be great. --Purduecer

Posted by purduecer 8 years ago


How to mix stereo & mono inputs for XBox headsets

Does anyone know the best way to merge/mix a stereo input and a mono input so that the stereo remains stereo, but the mono input can be heard across both ear pieces? I've got a project in mind to create a box which will do this for using normal headphones for my Xbox 360 in-game chat. I'm just not sure if I need to isolate the mono input with a diode so that it doesn't turn the stereo input into mono.

Posted by WildBlueRhino 7 years ago


Free video editing software that doesn't use much memory?

Hello guys! I am looking for a couple of days for a free video editing software that doesn't use much space, since I have a mid-range Laptop.  I am not looking for the best of performance, just some simple software where I can cut and merge videos together, and simple things like this.  Also, Can anyone tell me what would be a good laptop to get for a lot of video editing? Or a desktop computer maybe..

Asked by dsirotic 3 years ago


Any video game ideas?

Hello, I am making a game and I have ran out of ideas. I has hoping that maybe some people might have ideas they would want in a game. It has a building aspect to it like minecraft, or terraria. The game Is about a merge of time lines, like Medieval knights and gulf war soldiers. I don't really want a whole new plot, but small ideas like enemies or other little parts.           Also If I use your idea, I will tell you and if its implemented in the game i might even pay you.Thanks you!

Posted by theodore665 5 years ago


Why hasn't the steam engine been reborn for modern cars?

With present gas/pollution concerns and green tech merging with cars left and right... Why hasn't the steam engine been reborn? I mean what takes MORE power, Electricity to move a 1000lb car or heat up a heating element to heat water and make steam? With tanks strong enough to hold Hydrogen for cars why cant the same tech be used for a steam engine? All the fuel you would need would be water (solar panels/batteries to power heating) but just water for fuel. Thoughts?

Asked by Green_Primus 9 years ago


How do womens brains and minds work ? Help....can any man work out this "only women know the answer to this" question.? Answered

I am a simple genious of a man, How do i ever stand a chance alone. But by the power of " Male Merging" ( The collection of many fine male minds) we must work out the answer to this age old question for the preservation of the future male generations. Forget trying to work out Pi to the zilionth decimal. That is childs play THIS is the real puzzle, So calling male brainpower accross the W.W.W Your gender needs YOU !!!

Asked by mickcaulton 9 years ago


How can I combine stereo audio from a 3.5mm connector to an RJ11 phone jack?

So I can listen to music while I am on a call. I am using a binaural cordless headset that has a base with an RJ11 jack for the phone headset connect from the phone line. There has to be an easy way to merge the phone line input with my audio input; like a reverse 'Y' connector, one RJ11 connector the other a 3.5mm male connector, to combine to an RJ11 Male connector. I know there is a trick to doing this. That's where the Instructables community can help! Thanks!

Asked by spytech128 8 years ago


Making a [4-Pole TRRS to 3.5mm Stereo & Mic Adapter (Male to 2x Female)] from an iphone headphone splitter jack?

I want an adapter that merges the microphone and earphone 3.5 mm jacks into a single 3.5 mm jack ( basically I want to build the blue adapter thingy). The problem is how do I connect the  microphone pins from the 3.5mm jack? That is how do I connect the two leads marked "?" (see the third picture for what I want to achieve.) PS: I am not sure whether the microphone jack pinout is the same as drawn. Anybody can confirm whether this is right?

Asked by rammstein2 2 years ago


Is it possible to generate and display waves using the same arduino due board in real time???

OK!So I intend to design an Arduino Waveform Generator interfaced with the Nokia LCD 5110 with Keypad support.I have successfully incorporated the Keypad interfacing part but have stumbled upon waveform display on the Lcd. My program generates waves on DAC1 which i then give as input on the Analog(A0) pin of Arduino Due just like an oscilloscope takes an input externally.i tried merging it with another program which takes an analog input from the function generator and displays it on the LCD.More importantly,the programs work fine individually! So,is it possible to do this on the same board????Where could i possible be going wrong? Reply asap !!

Asked by Lakshya1503 1 year ago


How can I use the parts from a broken Nintendo DS to upgrade my DS?

My friend gave me his broken DS, and since I didn't have any other way of taking it apart, I ripped it apart by the hinges. So now I want to know how I can do these things to my DS to make it better: Add a second battery socket to increase battery life x2 Add new speakers for double sound Add one screen to each side of the Touch Screen Put more buttons to enhance gameplay Add more LEDs for more signals Merge the two DS outer shells together to make a multi-colored DS Anything is appreciated. Thanks.

Asked by crabsintrees 8 years ago


Illustrator Question? Answered

So, I have a tricky illustrator question. I'm trying to make a more traditional jigsaw pattern for my peices. My plan was to download an image of a jigsaw template, image trace, expand to make a series of paths. Things work out pretty well, except my puzzle shape all have complete outlines. This creates a lot of overlapping paths which would have the laser pass overvthe same sections repeatedly. I'' trying to avoid this, but can't seem to find a way over merging overlapping paths. I could always deal with this manually, but I'd love to know if there is a fancier/more elegant solution. Also, with regards to cut paths. Is it ok to have many separate? Or is it better to have them all connected into one? If the former is acceptable, how does the printing softwarr determine the sequencing of cuts for the tool pathing?

Asked by Taolin 1 year ago


how do i add an extra output to my r/c reciever circut board and remote control?

Hi, i was wondering, how do you add an extra output to a r/c reciever circut? what i have is a reciever from a small r/c truck, and im planning on turning it into a tank that requires 3 out puts , not 2 that the reciever has. curently, my controller has 2 levers for making either side of the truck move, both and the truck moves forward 1 and it spins, what i need is a third lever to operate a relay to set off a cannon. what i have currently is a second reciever that opperates on a different frequency to the truck, could i possibly merge the two without using a second controller?

Asked by oldmanbeefjerky 7 years ago


Joining carpet pieces

I'm looking for ideas on how carpet pieces might be joined together into a whole (e.g. rugs made from carpet samples). The gaffer tape solution which is posted all over the web in tutorials isn't strong, only lasts a few months and doesn't work well with small carpet pieces.  I've successfully sewn carpet piece in the past with fishing line (so the stitches are strong and invisible) however this technique only works well with larger pieces due to the time it takes and amount of work.  Has anyone here tried any other techniques and been successful with both large and small carpet pieces?  My other idea was to use wood glue to glue the pieces to a hessian sheet.  I haven't tested this but the hessian base on most carpet pieces should merge well with the hessian sheet. thoughts or ideas appreciated.

Posted by garrettlynch 11 months ago


How can I use a portable scanner with a tablet PC?

Hello, I'm trying something new: I want to completely eliminate paper (and all the messes and lost handouts that go along with it) from my high school career by using a tablet PC and a portable scanner to instantly digitize everything and keep it in one neat, organized spot. However, I'm not sure what the best way to do this is. Basically, I'm looking for a tablet that has - 6 to 8 hours of battery life to last through a day - as large of a screen as possible - the ability to view and search through PDF files - the ability to view and edit text documents (preferably with handwriting recognition) - the ability to effectively sort and organize large numbers of PDF and image files into folders that I can easily access - support for Java and Flash - WiFi - and the ability to connect with a portable scanner that can scan several pages, convert them to PDF files with text recognition, and merge them into one large document Unfortunately, there are so many tablets available on the market that I haven't been able to process everything that I'm seeing! One of the problems, however, seems to be that the new Android tablets are really nothing more than large cell phones and will not be able to interface with a portable scanner in the capacity that I want them to (using an SD card to transfer image files to my tablet from my scanner would not be enough - is there any app for text recognition, PDF conversion, and PDF merging?) while Windows 7 tablets suffer from bulkiness and short battery life. Also, from what I've read, while Windows 7 is optimized for tablet use, with multitouch compatibility and handwriting recognition, many standard Windows programs are not, making them difficult to use without a keyboard and mouse. Do any of you have advice? Thanks! Xellers

Asked by Xellers 6 years ago


Aduino Bluetooth code problem!

I am building a Morse Code machine with bluetooth functuonality.  It is in the early stages at the moment but I have hit a problem. My code uses a button to input Morse code which is displayed on an LCD and flashes an LED on pin 5, but also incorporates a bluetooth HC05 which controls an LED on pin 13. Seperately, they work fine but I wanted to merge the two sketches. I have succeeded but for one small problem. When pressing the LED 'ON' button on my android app, the LED only comes on after the Morse code button has been pressed. And it works the same way for the LED 'OFF' function on the app. Press it, then press the Morse code button and the LED switches off again. This repeats. I cannot figure out why this button is controlling the Bluetooth LED command signal. I have changed baud rates of the bluetooth but to no joy. I have attached my code. Can anyone help me solve this problem?!?

Posted by Satans Thong 2 years ago


Help: Connecting in-built laptop speakers (spare) to a headphone jack.

Hello, I had an hp laptop which had altec lansing speakers. The laptop broke and it took out the parts within it. The speaker type is exactly this one- http://mcccomputers.com/shop/6350-14879-thickbox/hp-dv2000-left-and-right-speakers-speaker-set-417089-001.jpg Now I tried to connect them to normal headphone jack but it appears I am doing something wrong. Also, there are 2 pairs (4 wires- red,black and white, green for each speaker) which all go separately for this speaker. But I notice in case of our simple headphones the wires seem to merge together. I hope I am able to convey what I am trying to say. Is there any way I can make these speakers work via a headphone jack? I also have a mic obtained in the same fashion and it also has the same issue. Any help would be greatly appreciated. Cheers!

Asked by simplyrohit21 6 years ago



Pixlr Trouble Blending 2 Exposures for Real Estate

Hello, I am testing out the pixlr.com editor version... Opening 2 photos of exact same shot... one with blown out windows in a house and one with the outside view showing in the windows.  Each time I try to use the brush mode, click black and drop the opacity... nothing happens. Here are the exact steps.. 1. Open both photos at once 2. copy and paste the bright photo over the top of the dark photo 3. delete original photo 4. unlock box for darker photo and check the box 5. click add mask layer (I get a red box next to the white box on that layer) 6. Merge visible 7. Click brush select black and lower opacity... Nothing happens Sometimes opacity is already at zero.. other times I can get it at 100% and drop it all the way to zero and nothing changes. Anything I am missing or doing wrong? Here's 2 photos for an example

Posted by BrettB57 1 year ago


Input on building a TARDIS Console bar would be appreciated

My boyfriend and I want to have a Who-themed room party at a sci-fi/linux convention in our area.  We've bounced around the idea of having a TARDIS console bar set up in a corner of the room, so I'd really appreciate ideas for the console that could easily be set up and broken down, as this is  going in a room we only have for a weekend. Ideas for random gadgets and doo-hickeys, places to have alcohol and the like would be greatly appreciated as well.  So far we know we want to have a quarter or half keg in the center of the console, located behind us. Leaning towards 10th's design, but might be willing to go for the 11th's more steam punk look. Also, decorating tips for the room as a whole would be good.  So for we want to make roundels out of foam and stick them to the wall with tack to imitate the 10ths 'desktop theme' and to print a door sized TARDIS door to tack to the door to the hotel room. The idea behind the party is that the hotel room and the TARDIS have merged, ala Time Crash.

Posted by greenpixi 7 years ago


Looking for input on a TARDIS console bar

My boyfriend and I want to have a Who-themed room party at a sci-fi/linux convention in our area.  We've bounced around the idea of having a TARDIS console bar set up in a corner of the room, so I'd really appreciate ideas for the console that could easily be set up and broken down, as this is  going in a room we only have for a weekend. Ideas for random gadgets and doo-hickeys, places to have alcohol and the like would be greatly appreciated as well.  So far we know we want to have a quarter or half keg in the center of the console, located behind us. Leaning towards 10th's design, but might be willing to go for the 11th's more steam punk look. Also, decorating tips for the room as a whole would be good.  So for we want to make roundels out of foam and stick them to the wall with tack to imitate the 10ths 'desktop theme' and to print a door sized TARDIS door to tack to the door to the hotel room. The idea behind the party is that the hotel room and the TARDIS have merged, ala Time Crash.

Posted by greenpixi 7 years ago


Tour of the Largest Private Collection of Military Vehicles

Through the MIT Club of Northern California, Christy and I got the chance to tour the Military Vehicle Technology Foundation's collection in Portola Valley. Seeing 100 tanks from different time periods lined up and seemingly ready to roll was pretty amazing. I've always had a thing for half-track vehicles, and was especially pleased to see a half-track motorcycle (SdKfz 2 Kleines Kettenkrad). In all honesty, this is probably one of the most impractical vehicles ever created, but it just looks so cool. My other favorites to see in-person were a SCUD missile launcher (SS-1b Scud A) and an M48A5 AVLB (armored vehicle-launched bridge).They also have a large shop where they repair, rebuild, and often re-engineer parts to restore the various tanks. While I was there, they were in the middle of repairing a World War II-era German tank found in a river. The collection is the hobby of Jacques Littlefield, whose father, Edmund Littlefield, amassed a $1.7 billion fortune by running the family construction and mining company, Utah International, and merging it with GE (more here at Forbes).The Instructables forums aren't exactly the best place to few 57 pictures, so here's my Flickr set, and here's the Flickr set of the person who organized the tour.

Posted by ewilhelm 10 years ago


Warrior Dash Costume

Www.warriordash.com This event is coming to Florida and I am going to participate in it with a few of my friends. Before this competition takes place I would like to have a costume made for me to wear during the race. So my challenge to any DIY'ers who would like to engage is to make a costume I could wear to Warrior Dash. The creator who makes the best costume will be rewarded by me wearing it to this event. Usually the people in costumes are the ones the film crews capture video of at all the Warrior Dash Events so there's a strong possibility your costume could show up. I will pay shipping and handling if required. Tomorrow I will post up my measurements. I would need this costume made & shipped to me before the 22nd of January 2011. Costume requirements: Can be any design relative to Warrior Dash or vikings, knights, animals, any tribes/clans/kingdoms, video game characters, etc. Whole costume not required could be anything from just a mask, gloves, body armor, signs, leggings, gloves, accessories Creators are encouraged to collaborate in order to be more efficient and merge ideas together Best of Luck Thanks, to anyone's intrigue I may have peaked

Posted by apeworld 7 years ago


Graphical User Interface Library for Physical Computing in Processing

Visit our blog:    http://blog.butterflui.org/?paged=3 The subject of physical computing, especially in the field of robotics, is a fascinating area that has already begun its triumphant in universities, schools and hobby applications and is developing with impressive speed. It is highly interesting that Pyhsical Computing and Robotics, more than any other area, can merge many different areas (engineering, design, psychology, biology and many other areas). Our target groups are mainly users with robotic and physical computing affinity: engineering, programmers, mechatronics engineers, product designers, interaction designers, communication designers, robotics, interface designers, developers, electronic engineers and artists. There are people who want to monitor and control the input and output of their system without major effort in which they rely on an interface library. Robot experiment sets are increasingly being used in short-term projects in schools and universities to provide basic knowledge on physical computing. Our analysis of current sets shows us that existing features don’t cover all aspects of robotics. The aspect that has been neglected so far according to our research, is the controlling and monitoring of experimental physical computing projects through a graphical interface. Visit our blog:    http://blog.butterflui.org/?paged=3

Posted by faydemir 4 years ago


Science Fair idea: Bouncing Liquids

Here's an idea for the science fair: Bouncing liquids. Explain how it works and do something cool with it!http://www.nature.com/news/2007/070716/full/070716-17.htmlLiquids bounce againJumping jets move from the bathroom to the kitchen.After bouncing shampoo, physicists now bring you bouncing cooking oil. A team in Texas has found that the trampolining of a liquid jet falling onto a bath of the same liquid is more common than expected.Last year, a group in the Netherlands studied this bouncing effect for a jet of shampoo (see 'Puzzle of leaping liquid solved'). The bounce, which was first reported more than 40 years ago, happens because of the peculiar nature of shampoo, which gets thinner (less viscous) as it flows. A jet of it hitting a liquid surface is therefore lubricated by a thin layer at the interface, enabling it to bounce off rather than merge.But the liquids now studied by Matthew Thrasher and his colleagues at the University of Texas in Austin don't have this property. The silicone oils in their experiment are viscous but have 'normal' flow behaviour, like water.The researchers directed a jet of oil vertically onto the surface of a tank of the same oil. They found that the jet could undergo both a 'leaping' rebound and a bizarre 'flat' bounce in which it sprang horizontally across the liquid surface.The bounce here is due to a thin layer of air that separates the two liquid surfaces, the researchers say in an article submitted to Physical Review E.They point out that the effect can easily be recreated in a kitchen experiment with cooking oil. Just fill a glass pie dish with about 4 centimetres of oil and pour onto it a thin stream from a cup about 3 to 6 centimetres above the surface. While pouring, move the stream in a circle about once every 2 seconds (or perhaps less messily rotate the dish on a Lazy Susan). The bounce can be encouraged by passing a chopstick or some other small rod through the stream every now and then.

Posted by ewilhelm 10 years ago


Idea for Social Electronic Art

Hi everyone, I have been working on an idea for a new type of electronic creative art form. Social media has increasingly become cloud and computer-based, enabling people to network and share ideas and concepts online with others from around the world; this community is an excellent example of the power of electronics in fostering shared creativity. Art has always been an important aspect of society, bringing people together through the power of self-expression. In recent years, graffiti parks have become a popular method for communities to express themselves in a constructive way. In the area of electronics, circuitry and robotics have become increasingly accessible through open-source programs such as Arduino, enabling anyone to build complex and beautiful projects in their own garages (or anywhere!). This idea focuses on blending the social aspect of conventional art mediums with the untapped potential of electronic technology. One new technology in particular that has taken the first step towards merging the different fields of creativity is conductive ink and paint, created by Bare Conductive. This graphene-based material enables users to paint circuits and electrical systems onto most surfaces, opening up the entire world as a building area. Essentially, this is the focus of the idea- creative communities making the world their canvas through the power of conductive ink and open-source electronics tools. Imagine the possibilites! Walls covered with lights that can be activated by touching a drawn image, buildings covered with playable arcade games and interactive media, and childrens' parks with community-sourced learning tools on the play area! Of course, there's another aspect here; the social possibilities. See a circuit that someone didn't ever finish, or a piece of electronic art that you wanted to expand? Whip out your Arduino kit and ink bottle, and draw it in! Every wall would tell a story, and it would never stop growing. Our imaginations would be the only limit... What does everyone think of this idea? Let me know any thoughts or input you might have!

Posted by Chikpeas Brother 3 years ago


Cool Crafty CREATIONS (for little & big peeps of all ages)

As a new mom (of six months) to a beautiful baby girl, Madeline Ann, I LOVE how I can merge my passion of creating and parenting together! Right now, I create big girl things for myself still mostly & cute things for my tiny tot. I love checking other creative momma's ideas out. (or creative people's creations', period) I started a blog www.kreativekatiekonnect.blogspot.com and I've learned that blogging as a new mom is HARD! I just can't find the time to be as consistent as I like and haven't really gotten the knack of documenting all of my projects, photographing each step, editing, writing, posting & then SHARING hoping for followers. Maybe, folks in this group who have a little blogging experience can help me out with this.  This group is made by Me for You creative folks who love to make/create almost anything & everything. (From drawing potraits, photography, any cool crafting, sewing, mod podging, refurbishing & the list could keep going to infinity, really!) I have been refurbishing old furniture lately, painting & personalizing mailboxes, creating really cool stuff for my little one & TRYING to sew a few things here and there for her (and would love to for myself). I am hoping I can share some of my ideas with you and vice versa!  I love new ideas & I really hope you will join up with me and share yours along with enjoying one's that I share with you! Please excuse my POOR grammatical errors and lack of good writing/typing.  It's difficult to type while holding a baby, rocking, ect. LOL So, bare with me & excuse my writing, but appreciate my creativity because I CAN'T WAIT to see your creations. (or anything you share) Xoxo Katie Let's link up EVERYWHERE: Yay =-) : *Follow me on twitter @TheKatiePett  *Like me on Facebook  www.facebook.com/KreativeKatieKonnect *Check my blog out and pls share your thoughts: www.kreativekatiekonnect.blogspot.com Also, if you have a blog, twitter, or facebook page- please share w/ me and I will totally follow you and keep up with you! I'm a devoted fan once I meet ya! :) #FanOFcreativity

Posted by thekatiepett 4 years ago


Integrating Highschool Sciences

Irene Duke, Kate Hoff, Lyndsay Carlisle and myself are participating in the MIT course 11.124, _Introduction to Teaching and Learning Science and Mathematics_. We have a variety of teaching interests: Irene hopes to teach chemistry, Kate to teach Physics, myself Physics or Mathematics and Lyndsay hopes to teach social justice / political history. Provided Make magazines as inspiration, we were tasked to design a joint activity, merging four high school classes of these topics for a period of weeks or months. We developed the ideas described in this first entry over the course of a class period. Hopefully, we'll take the time to expand each step into an instructable, possibly including trials by fire teaching 8th-11th graders. The material is structured by conservation of energy and resources, inspired by the articles of Tim Andersen. The final demonstration we envision motivates the particular material we wanted from each field. A bicycle wheel is drives an alternator transforming mechanical energy into electrical. The electrical energy is used to run a electrolysis process, rendering separate measurable quantities of Hydrogen and Oxygen. The Hydrogen and Oxygen are then combusted for the students. The amount of mechanical energy can be measured, as can the electrical. The binding energy of H_2O can be used to determine the chemical potential energy rendered. Finally, the combustion both demonstrates the energy's new form, and the difficulties in storing energy. The difference between power and energy underlies all of these experiments. Conservation of linear momentumn should be a familiar topic with the students. Conservation of angular momentumn can easily be introduced at this point, demonstrated with the bicycle and a fly wheel. Chaning the orientation of the wheel can be exteremely difficult. For the chemical portion of the experiment, stoicheometry should be familiar to establish the link between the amount of gas generated and the energy invested. The most appropriate mathemetical tools are statistical. Sampling, linear regression and averaging would prove useful throughout the experiments. Global economic relationships leading up from the colonial period would perhaps be the most applicable topic form history or the social sciences. Though not a technical detail, an important aspect of executing such an idea involves the actual deployment of resources. Students could, for example be broken up by their topic of interest, whether it be the physical, chemical or social aspects of the project. Next, new groups would be formed with one or two members from each subject area. These groups could then attempt to execute the design from the first slide, or one which is similar. Throughout, the students will present their thoughts or understanding to the teacher. This design project should perhaps be phrased as simply turning mechanical energy into hydrogen. Students with social scientific background might be responsible for estimating the costs of the implementation in different settings, and that would be used to drive a larger scale version. So, before getting started on building and documenting this project, do people have suggestions? What worked to combine the physical sciences for you? What might have worked?

Posted by mmt 11 years ago


Automatic Irrigation using d1 mini

Hi Everyone, I reviewed different automatic irrigation system projects here in instructables and other sites as well and i decided to gather parts to do a simple small project myself. One thing that comes hard is the programming part as I don't know any programming language. I'm looking for some help with code merging, explanation and some general guidance. Could you please let me know, point me to right direction and tell me what you think and if requirements are actually achievable? What I would like to achieve: Intention of this project is to have manual and auto irrigation system which will: 1. Measure soil moisture and dependently on the value activate the usb pump which will water the plant (preferably analog output that will show the measurements in %) 2. Manual activating the pump via hardware button and via mobile phone with internet connection 3. Distance sensor which should measure how much water is left in the tank 4. Email notification with info when to water the plants and soil sensor data regardless of the automatic process that has already started 5. Email notification with info about the water in the tank when it’s near empty 6. Dashboard preferably inside the network (not using third party like blynk or others) with access from the internet (I have QNAP that I think can be used). 7. If possible – have amazon echo (Alexa) read the sensor data to tell me the values and comment if the plant should or shouldn’t be watered or the tank should be refiled or not as well as ability to ask Alexa to start or stop the irrigation Hardware: D1 mini: https://wiki.wemos.cc/products:d1:d1_mini Wemos V2 Relay shield: http://hobbycomponents.com/shields/865-wemos-v2-relay-shield My relay is slightly modified: 2 small wires soldered to the vcc and ground so that when it receives the signal on d1 pin it opens and current flows to female usb connector supposedly activating the usb water pump. All this can be stacked together even with soldered wires YL-69 sensor: http://www.oddwires.com/yl-69-soil-hygrometer-humidity-soil-moisture-detection-sensor/ Ultrasonic Distance Sensor (HC-SR04): https://thepihut.com/products/ultrasonic-distance-sensor-hcsr04 USB mini water pump: www.goo.gl/yUABDd Button x4 if needed: Board x4 if needed: sample codes used in other projects: https://randomnerdtutorials.com/guide-for-soil-moisture-sensor-yl-69-or-hl-69-with-the-arduino/ https://create.arduino.cc/projecthub/nekhbet/using-the-yl-39-yl-69-soil-humidity-sensor-with-arduino-968268 https://community.blynk.cc/t/irrigation-relay-with-timer-esp8266-wip/700 Alexa enabled homemade cat feeder example: https://www.hackster.io/darian-johnson/alexa-powered-automated-cat-feeder-9416d4 Thank you very much in advance for your help and support.

Posted by wube 9 months ago


How can I wire a recorder cut-in box?

So, a little background: I'm a reporter, and I do a lot of telephone interviewing. There's currently not an app that works reliably for my phone to record both sides of a call, and given that I already have a very nice standalone voice recorder (sony ICD820) that has line in/line out functionality, I'd like to have a way to run the signal from my phone into the recorder, record it, and then pass it on to a headset with a mic on it. The problem is that the recorder only has 3.5 mm stereo in/out (TRS), with no separate mic channel, so if I connect the (TRRS - mic/l/r/ground) cable from my phone directly into the recorder, then connect my headset to the 'line out' port, it ends up distorting badly, and not recording the mic channel. As a temporary solution I A) use two "Y" cables (one connected to the phone, and one to my headset) to split the mic from the audio channels, then B) feed the audio channels into and back out of the line in/out ports on the recorder, and then C) use a coupler to mate the two mic channels. This puts the recorder in-line on the audio channel(s) only, and routes the mic channel directly from my phone to my headset (picture attached). This works great, but it's bulky and delicate, and obviously only records the incoming side of the conversation.  THE QUESTION: How can I wire a box that will give me the ability to "cut in" a recorder on a TRRS source, which is delivering (potentially) stereo audio channels along with a mic channel - ie, up to three channels - so that the recorder is recording all three channells? (note: it does not matter if some/all of the channels are merged). WOULD IT WORK TO wire a box that A) summed the Left and Right channels from the phone using resistors on each channel (see the picture in the link), and B) fed the summed audio and the mic lines into the Left and Right pins of a TRS plug, respectively, to give the recorder a stereo source? I have put together a crude diagram of what I think this could look like (note that the diagram includes a DPDT switch to 'cut in' the recorder, but I would likely omit this in the final design for simplicity). Additional question: I have seen wildly varying info on what size resistors to use on the summing circuit, and also conflicting information as to whether I need a third on the ground (???). The simplest I have seen is just using a 1K resistor on each of the incoming channels. Given that these are just standard headphone/passive mic voltages, what size resistors would I need, and where in the circuit? Link to the simplest 'summing box' diagram I hve found for this type of application (top image): http://techtalk.parts-express.com/forum/tech-talk-forum/60443-stereo-to-mono-summing-circuit

Asked by ThomasJ126 1 year ago


Your War Stories

Everyone who has played war simulation games probably has a story to tell, I know I have a few. I would like to hear about your past experiences. This being the internet, anybody can claim to have done anything. Please try to be honest in your stories. Paintball:I was pinned down behind a tree that was barely the width of my body. Three enemies were bunkered up behind a felled tree in front of me, all of them shooting. I could hear their bullets whizzing inches from my head, and I was getting covered in splatter from the paintballs breaking across the tree. If I moved even an inch, I would be exposed. I was completely helpless. One of my buddies ran up to help, taking cover on my right. He was gunned down in less than a minute. I was trapped behind that tree for what seemed like an eternity. Luckily, one of my teammates (we call him Rambo) flanked the bunker, ran up from behind, and shot all of them in the back. When I looked at the cover I was behind, the tree and surrounding area was completely painted. I was on a speedball course behind cover, exchanging fire with (of all people) my brother. I look up, and he is charging up the field directly at me. Panicked, I take some shots at him and nailed him in a very sensitive area. He immediately went down and stayed down for several minutes, rolling around in pain. I captured it on my Gun-cam, you can see the paintball hit it's mark.(I've got plenty of good paintball stories, but I want to keep this short.)Airsoft:We were playing Ambush: VIP, and I was the VIP (No gun. I die, we loose). The course consisted of trails in the woods which lead to an open field. I had to go through the woods and across the field to a designated endpoint. The first leg was uneventful, we saw no action through the trails. When we reached the tree line, we decided it was best to book it across the field. We ran to the tree line, my bodyguard about ten feet ahead of me. He was the first to break the tree line. As soon as he did, he was shot up the leg and chest from near point blank range by a full auto MP5 and toppled over. As soon as I saw this I tried to do three things at once (thinking Oh Spit!): come to a sudden stop from a full on sprint, change direction, and book it in the opposite direction. Let's just say I face-planted and got shot up on the ground. I was stalking a guy who was facing me, staying just inside his peripherals (at least ten feet away). I shot him and, knowing the noise would attract others, immediately went prone in my ghillie suit. I was right, his teammate showed up to investigate. I took him out easily. This attracted a third teammate. I waited a good five minutes and, thinking he had gone, stood up to flank him. Turns out I stood up right in front of him and was subsequently lit up like a Christmas tree. (All these stories may make it sound like I suck at paintball/airsoft, but the most memorable events are often your worst.)Edit.I actually ended up writing an English paper on one of these stories. The Clearing A ski mask pulled over his face, Robert steadied his AK-47. The surrounding shadows merged with his dark sweatshirt and jeans. Shifting his weight, he anxiously scanned the path ahead. Both of us were sitting ducks here, he knew it. We had come to a fork in the road, providing us with two options. We could continue down the well-worn dirt path, or divert to a small, overgrown trail. "Come on." Robert whispered, eying the smaller trail, "Let's go."The objective was simple; navigate a maze of trails through the woods, cross an open field, and reach an endpoint on the other side. There was just one small problem; I must make it to the endpoint alive. I was the designated V.I.P., forbidden to carry a firearm and it was game over if I died. It was Robert's duty to escort me to the endpoint in one piece. Robert disappeared into the overgrown trail. Waiting ten seconds, I continued after him. Pushing aside ferns and thorn bushes, Robert and I slowly advanced. We knew it would be safe, they wouldn't expect us to follow this trail. Nonetheless, we kept a wary eye on the trees and bushes ahead. It was unusually hot, and I was beginning to sweat under my stuffy ghillie suit. The surrounding woods were eerily silent, a calm before the storm. As if on cue, there was a rustle off to our right. Immediately, Robert raised and lowered his palm, swinging his rifle in the direction of the sound. Catching his signal, I crouched low to the ground, adrenaline seeping through my veins. Tense, we waited for the seemingly inevitable. More rustling, this time accompanied by flapping. Robert's finger tightened against the trigger. A form shot out of the bushes, rapidly ascending to the branches above. It is just a bird. Sighing with relief, we rose and continued down the trail.We arrived at the edge of the woods, beyond which lay a small clearing. A mere one hundred feet separated us from the awaiting endpoint on the other side. One hundred feet of open field, it might as well have been a thousand. Robert and I came to the decision that we run across as fast as possible. We would be completely exposed, our fate placed at the mercy of the clearing. Drawing a deep breath, Robert sprinted toward the tree line. I followed, maintaining a distance of ten feet. Approaching a full sprint, Robert burst into the clearing. He managed to complete five strides before a sharp rat-tat-tat shattered the silence. Time slowed, Robert cried out in pain and toppled into the tall grass. He had taken several hits up the chest and legs at point blank range. A dark figure rose from the bushes directly ahead, looming above the surrounding flora. I was sprinting, full speed, to my doom. My mind went blank, overridden by three instincts: stop, turn around, and run. I attempted to complete all of these tasks simultaneously: come to a dead stop from a full sprint, turn one hundred and eighty degrees, and run. Momentum sternly disagreed, sending me in an awkward flying flop to the ground. Stunned, I lay on the forest floor at the edge of the woods. Regaining my senses, I felt several bee stings crawl up my back. I was hit, game over.

Posted by Spl1nt3rC3ll 9 years ago


The low-down: Where have I been?

It may be a bit narcissistic for me to think anyone missed me or even noticed I was gone, but for those of you that did notice heres the low-down.Without a doubt, the time I spent working at Instructables last summer was the most fun I have ever had in my life. It was the perfect combination of working among smart creative individuals ( Eric, Christy, Tim, Paul, and Noah), having such an open ended job where I was actually paid to do what I love, and being in bright sunny free thinking northern California. The cherry on top of this summer of awesomeness was going to Burning Man (see pic below). It was something I had wanted to do ever since I had read about it online many years ago, and, as fate would have it, I ended up going the first year I was actually old enough to.I don't think I am ever going to forget driving Tim's manual truck (I don't know how to drive stick) on a deserted road in Nevada, at 3:30 am Sunday morning, the energy drinks wearing off and Tim sleeping peacefully in the passenger seat, while it rained intermittently, with only a vague idea where I was going, and doing this all with just a NY state learners permit. Nor will I forget getting my first sight of the playa, just as the sun was coming up, with all the massive metallic sculptures glistening on the horizion. The week that followed was just pure surreal amazingness. Anything I wrote about my first Burning Man experience wouldn't give it justice, but Tim describes it nicely in his Burning Man instructable.The most surprising thing about the summer though, was that by the end of it I actually looked forward to going back to school. I wanted to learn circuit building and other cool electrical engineering skills that I could incorporate into my future Instructables projects. I wanted to be able to post impressive electronic projects, instead of just minor circuit hacks like the tazer glove and capacitor charger. I wanted to master the movement of the electron.One plane trip from SFO to JFK later, I'm back home. The contrast between Frisco and NY was staggering. If there was one word to describe how NY looked to me at that time it would be "gray". The experience was like watching the Wizard of Oz in reverse, going from the bright, colorful, surreal land of Oz back to black and white Kansas. Don't get me wrong, I love my hometown. I am of the opinion that NYC is the single greatest city in the world (California wins as a state, but in terms of a single city nothing can compare to NY). If you don't agree with me, stand in the center of the Brooklyn Bridge and turn around to get a full 360 degree perspective. Your opinion will be swayed if not changed. Still, September 07 was a very gray month for me. It took me a few weeks to wade through the bureaucratic bullshit of Brooklyn Poly and finally get registered for classes. The classes I did get registered for were all prerequisites and nowhere near my area of interest. I know I am going to have to suck it up and complete them eventually (especially now that my school has merged with NYU, so I get to graduate with a much more impressive degree then the school I was originally accepted into), but at the time I was just too miserable and distracted to pay attention in class. It was even hard for me to respond to e-mails from summertime coworkers because hearing about the activities at the tower brought back memories of a happier time. I was in a state of near-complete mental shutdown, my creativity was shot, and I was depressed. I decided that I needed to take a break from school, so I took a leave of absence for the Spring semester. That leave of absence bought me a time period of 8 months to do whatever I wanted. I figure why not live out my weaboo fantasy, and travel to Japan. I can not say exactly when my obsession with Japanese culture began. Maybe it was subconsciously planted in my brain with the cherry tree in front of my childhood home, cultivated with anime, and brought to fruition when I actually started reading about their history and culture. Whatever the reason, it has been something I've always wanted to do, and what better time to "find myself" then while on a break from college (Its stereotypical-tastic!). There was only one obstacle standing between me and the romantic imagery I had of bathing in hot-springs and meditating in front of Shinto shrines ... money, at least a few thousand dollars of it. Japan aint cheap, and even if I was going to get a job to support me while I was there, I would still need a butt-load of money for the initial travel and living investment. (On that note if any of you Instructablites knows someone in Japan who you could get me in touch with regarding job opportunities or living quarters, or has some advice for living cheaply while there, I'm all ears) I spent most of January half-assedly looking for a job. I did not devote my whole ass to the task because, no matter how much I wanted to go to Japan, I wasn't too excited about the prospect of getting a minimum wage job which utilized none of my skills (I have very unique skills, so finding a job that used them would be next to impossible). It was looking as though my next few months would be filled with minimum wage menial labor. That is until I thought of throwing myself on the mercy of Eric and Christy, and asking for my old job back. I lacked the testicular fortitude to ask them directly, and so reverting to grade school mentality (the one that figures rejection will hurt less through proxy), I asked Tim to test the waters and see if my old job was still available (grade school version: Psst Tim, I've got a crush on Eric & Christy ::school girl giggles:: can you ask if they like me). Tim was kind enough to oblige. A few e-mails later I found out I could come back as long as I promised to return to school in September. (This was no problem because I had already made the same promise to my parents, and myself because I didn't want to loose my 20k a year scholarship).One plane trip at the end of February from JFK to OAK later, I'm back in California. My longterm goal for the next few months is to live as cheaply as possible, learn Japanese, and try to acquire some work that I can do while in Japan. Living cheaply has been easier then expected. I quit smoking (something I thought would be much harder then it was, but after two months of lukewarm-turkey I was able to eliminate my nicotine cravings entirely). I am able to feed myself almost entirely off the excess of others, with the occasional purchased produce being the exception. I bike for transportation (that same yellow road bike in the picture below). I'd say that overall, it took more effort to stop being a consumer-whore then it did to quit smoking, but it feels equally good to be free of both of those bad habits. Well thats my story. I should probably get back to work.New instructables coming soon ...

Posted by Tetranitrate 10 years ago


sys/time.h missing when compiling in MS VC++

I am trying to use opencv for my arduino robot. Here's the problem: when I try to compile?rebuild in VC++, it says that /* * The program used in the YouTube video http://www.youtube.com/watch?v=Gg6zqjDq1ho * * This program allow to rotate a webcam to track an object. This is * done by using Arduino to control a servo motor. The communication * is done using a serial connection (through USB or native). * * To compile it under Linux (assuming OpenCV was previously installed): * *   g++ -O2 -W -Wall -lhighgui tracking.cc -o tracking * * See the documentation to get the Arduino program. * * Author: Frédéric Jolliton * Date: january 22, 2011 * Documentation: http://doc.tuxee.net/tracking */ #include #include #include #include #include //-------- PID parameters -------- // See http://en.wikipedia.org/wiki/PID_controller // These values must be chosen CAREFULLY. The strategy to find good // values is to set `ci' and `cd' to 0.0, then try to find a value of // `cp' that works the best (without too much oscillation) then, from // that, lower `cp' and increase `cd' until the system is able to // stalibilize more quickly. Increase `ci' if the system take time to // move to the target position. There are more complexes method to // find the "right" values. static double cp = 0.2; static double ci = 0.0; static double cd = 0.02; /* * Get the current time in seconds */ static double gettime() {   struct timeval tv;   gettimeofday(&tv, 0);   return tv.tv_sec + tv.tv_usec / 1e6; } int main() {   CvCapture*          capture = cvCreateCameraCapture(0);   if (capture == 0) {     std::cerr     return 1;   }   /*    * Window to display the input image.    */   cvNamedWindow("RGB", CV_WINDOW_AUTOSIZE);   cvMoveWindow("RGB", 0, 0);   /*    * Window to display the mask (the selected part of the input image)    */   cvNamedWindow("Mask", CV_WINDOW_AUTOSIZE);   cvMoveWindow("Mask", 0, 505);   /*    * The settings window    */   cvNamedWindow("Settings", 0);   cvMoveWindow("Settings", 652, 505);   // The hue range to select.   int                 hue_level_start = 0;   int                 hue_level_stop = 12;   cvCreateTrackbar("Hue level (start)", "Settings", &hue_level_start, 255, 0);   cvCreateTrackbar("Hue level (stop)", "Settings", &hue_level_stop, 255, 0);   // The minimum saturation level.   int                 sat_level = 100;   cvCreateTrackbar("Saturation level", "Settings", &sat_level, 255, 0);   // Target position.   int                 target = 320;   cvCreateTrackbar("Target", "Settings", &target, 640, 0);   /*    * Window to display the tracking state    */   cvNamedWindow("Track", CV_WINDOW_AUTOSIZE);   cvMoveWindow("Track", 646, 0);   FILE*               serial = fopen("/dev/ttyACM0", "w");   if (serial == 0) {     printf("Failed to open serial port\n");   }   sleep(1);   IplImage*           chan1 = 0;   IplImage*           chan2 = 0;   IplImage*           chan3 = 0;   IplImage*           hsv = 0;   IplImage*           monitor = 0;   IplImage*           result = 0;   double              angle = 1500.0; // the position of the camera   int                 tcolor = 0; // target color - Used to switch to predefined hue levels.   double              last_time = 0.0; // last time we updated PID   int                 last_known_x = 320; // last known position of the target.   double              last_error = 0.0;   double              i = 0.0; // integral term (here because it is accumulating)   int                 last_sent_value = -1;   for (int n = 0;; ++n) {     //-------- Get the input image --------     IplImage*           frame = cvQueryFrame(capture);     if (frame == 0) break;     cvShowImage("RGB", frame);     //-------- Allocate images --------     if (hsv == 0) {       // Allocate images if it is the first iteration.       hsv     = cvCreateImage(cvGetSize(frame), 8, 3); // 8 bits, 3 channels       chan1   = cvCreateImage(cvGetSize(frame), 8, 1); // 8 bits, 1 channels       chan2   = cvCreateImage(cvGetSize(frame), 8, 1);       chan3   = cvCreateImage(cvGetSize(frame), 8, 1);       monitor = cvCreateImage(cvGetSize(frame), 8, 3);       result  = cvCreateImage(cvGetSize(frame), 8, 3);     }     //-------- Process the input image --------     cvCvtColor(frame, hsv, CV_BGR2HSV); // convert to HSV (Hue-Saturation-Value)     cvSplit(hsv, chan1, chan2, 0, 0); // extract Hue & Saturation     // Create a mask matching only the selected range of hue values.     if (hue_level_start       cvInRangeS(chan1, cvScalar(hue_level_start), cvScalar(hue_level_stop), chan1);     } else {       cvInRangeS(chan1, cvScalar(hue_level_stop), cvScalar(hue_level_start), chan1);       cvSubRS(chan1, cvScalar(255), chan1);     }     // Create a mask matching only the selected saturation levels.     cvCmpS(chan2, sat_level, chan2, CV_CMP_GT); // Test Saturation     cvAnd(chan1, chan2, chan3); // Merge masks     cvErode(chan3, chan3, 0, 2); // Suppress noise     // Find the position (moment) of the selected regions.     CvMoments           moments;     cvMoments(chan3, &moments, 1);     int                 r = sqrt(moments.m00);     int                 x = moments.m10/moments.m00;     int                 y = moments.m01/moments.m00;     //-------- Mask window --------     // blue = hue selection, green = saturation selection, red = selected regions     cvConvertScale(frame, monitor, .3, 0); // faded out input     cvSet(monitor, cvScalar(255, 0, 0), chan1); // blue overlay     cvSet(monitor, cvScalar(0, 255, 0), chan2); // green overlay     cvSet(monitor, cvScalar(0, 0, 255), chan3); // red overlay     if (x > 0 && y > 0) {       cvCircle(monitor, cvPoint(x, y), r, cvScalar(0, 0, 0), 4, CV_AA, 0);       cvCircle(monitor, cvPoint(x, y), r, cvScalar(255, 255, 255), 2, CV_AA, 0);     }     cvShowImage("Mask", monitor);     //-------- Tracking state --------     cvCopy(frame, result, 0); // input image     cvLine(result, cvPoint(target - 60, 0), cvPoint(target - 60, 480), cvScalar(0, 0, 0), 2);     cvLine(result, cvPoint(target, 0), cvPoint(target, 480), cvScalar(0, 0, 255), 3);     cvLine(result, cvPoint(target + 60, 0), cvPoint(target + 60, 480), cvScalar(0, 0, 0), 2);     if (x > 0 && y > 0) {       cvCircle(result, cvPoint(x, y), 10, cvScalar(0, 0, 0), 6, CV_AA, 0);       cvCircle(result, cvPoint(x, y), 10, cvScalar(0, 255, 255), 4, CV_AA, 0);     }     cvShowImage("Track", result);     //-------- Handle keyboard events --------     int key = cvWaitKey(33);     if (key == 27) break;     switch (key) {     case 'r':       // Reset the current position. This is used to check how fast       // the system can return to the correct position.       angle = 1500;       break;     case 't':       // Quickly switch to a different tracking color (red or blue)       tcolor = 1 - tcolor;       if (tcolor == 0) {         cvSetTrackbarPos("Hue level (start)", "Settings", 0);         cvSetTrackbarPos("Hue level (stop)", "Settings", 12);       } else {         cvSetTrackbarPos("Hue level (start)", "Settings", 109);         cvSetTrackbarPos("Hue level (stop)", "Settings", 116);       }       break;     default:       // ignore other keys.       break;     }     //-------- PID processing --------     // If the object is out of the window, use last known position to     // find it.     if (x 640) {       x = 2.5 * (last_known_x - 320) + 320;     } else {       last_known_x = x;     }     double              time = gettime();     double              dt = time - last_time;     if (last_time == 0.0)       dt = 1.0;     last_time = time;     // the error we want to correct     double              error = x - target;     // the proportional term     double              p = error * cp;     // update the integral term     i += error * dt * ci;     // Clamp integral term     if (i > 30.0)       i = 30.0;     else if (i       i = -30.0;     // the derivative term     double              d = (error - last_error) / dt * cd;     last_error = error;     // the PID value     double              pid = p + i + d;     // Clamp PID     if (pid       pid = -100;     else if (pid > 100)       pid = 100;     // Update the position from the PID value.     angle += pid;     // Clamp angle     if (angle       angle = 0;     else if (angle > 2000)       angle = 2000;     printf("pos = %d, P = %f, I = %f, D = %f, angle = %f, dt = %f\n", x, p, i, d, angle, dt);     //-------- Send the position to Arduino --------     if (serial != 0) {       int                 current_value = angle;       // Send the new position if it changed since the last time.       if (current_value != last_sent_value) {         fprintf(serial, "%d\n", current_value);         printf("SENT %d\n", current_value);         last_sent_value = current_value;       }     }   }   cvReleaseCapture(&capture); } Here's the problem, when i try to compile/rebuild, it says that 

Asked by GraffikeL 5 years ago