Which microcontroller to choose?

Hi all, I need to use a microcontroller for my project and am thinking of getting the arduino UNO R3 development board which composes of the ATmega328 microcontroller. I have to connect a small motor, a 16x2 LCD display and a miniature heating element to the arduino. I would like to know if the UNO R3 is suitable for my project. PS: I am very new and noob regarding microcontrollers

Topic by kurtselva   |  last reply

Motorized tablet

Hi I want to put my nexus 7 into my car but i need to access to my factory radio behind my tablet. So i think about making motorized panel like this : http://www.youtube.com/watch?v=cfOm4K8EeHM http://www.youtube.com/watch?v=DL6PxvwuIyM But i don't understand how make that ? What kind of motors  ? Actuator ? Thank !

Topic by Hydr0   |  last reply

Finding proper charger for old rechargeable batteries?

I have a couple of old rechargeable batteries from random broken gadgets and was wondering how I could go about charging them? I have a bunch of old chargers too laying around. Thanks!

Topic by niiick 

555 timer cicuit

Hello guys I have a minor problem, I built a 555 timer circuit and it runs off of 6v. My plan is to use a 9v battery. Will the project be OK or will I need to drop the voltage and how would I go about that? Would I connect a resistor to the positive of the battery then to my project's input? Thanks, 

Topic by HavocRC   |  last reply

Back that Arduino Up

Hello instructables, I am a student at High Tech High North County and we are working with arduinos in our Engineering class. Our project is to create a reverse sensor for a motor vehicle, we are having trouble finding a way to set up the sensor with the arduino. The sensor we are using is HC-SR04 Ultrasonic Ping range sensor. If you have any idea on how to do this, please reply. Thanks.

Topic by hthnc-student   |  last reply

Arduino Pulse Sensor (Best Type of Arduino to Use?)

I am making a pulse sensor using an arduino, and I was wondering what type of arduino would be the best for this project. Here is a link to the tutorial I am basing my design off of: https://docs.google.com/a/hightechhigh.org/document/d/1FVFffuKD9OnkTOwxs3dVaxp5LYb4S1aj65MS6lvIZbA/edit?hl=en_US My goal is to make the pulse sensor as compact as possible while still able to be powered by an external power source (so it does not need to be connected to a computer to function), and as of now I have access to a traditional arduino and a lilypad arduino...which could be used to make the pulse sensor compact, while still allowing it to be powered through an external power source? Thank you!

Topic by hthnc-student 

Water gun alarm clock: where to connect it?

I'm making a water gun alarm clock where I'm connecting a wire from the sound box in the clock to the button on the water gun. Would it be easier/more effective if I connected it to the motor in the water gun instead of the button? The tutorial that I'm following says to connect it to the button but it didn't work the way I had hoped when I did that.

Topic by hthnc-student 

How do I make an arduino into a personal alarm clock?

Dose anyone know how to build a super easy to use alarm clock using an arduino? I am prototyping different types alarm systems and trying to solve one person's specific problem with managing bed time. I welcome any: ideas, suggestions, hunches, guesses, or building plans. Just a few things: the clock has to use an arduino and it has to be portable. The reason why I'm building it myself instead of buying an alarm clock is that it needs to be utterly simple and have personal meaning to the user. I am open to it not having to use an arduino. It should be easy enough for a child 6 years old to use. They should be able to set the time and the alarm on their own.

Topic by hthnc-student   |  last reply

How to cut down the Voltage???

Hello guys it's electricnewbie again, I have another newbie question that I think you can help me out with. OK so go easy with me since I'm a beginner. . . So, I have a laser/light (from walmart) that takes three 1.5 volt batteries that gives it a total of 4.5 volts. So, I want to hook it up to USB cable. Now, a USB cable supplies about 5.1 volts. How do I drop the current from 5.1 volts down the 4.5? How could I use the same principle in my other projects? Say I have a 9v battery and a 3.4v buzzer. I know how to use resistors with an LED. [R=V1-V2/mAH] Since I know the mAH of the LED, then I know what resistor to use. But how use that equation if at all on other things?? Thanks guys,

Topic by HavocRC   |  last reply

Which DSLR camera would you suggest, Nikon or Canon?

I'm thinking of purchasing a new camera so I just would like some input which one's better and what's the special features.

Topic by DianneB   |  last reply

Wondering What Kind of aTransistor I Need

I'm looking for a transistor that can control 12V from arduino which I believe is a 5V signal? If I'm wrong, I need what it gives off but I'm looking for one to control motors that are 12V. Thanks!

Topic by MackeFeet   |  last reply

Laser Alarm System

Hello guys, I need some help building a circuit. I'm new to electronics, so go easy with me. Is there a way to build and laser alarm circuit but instead of the alarm going on just when the beam is broken the alarm stays on until I turn it off? Circuits like Kipkay's only go off when the beam is broken. How can I make the alarm stay on once the beam is broken? Thanks

Topic by HavocRC   |  last reply

Non-Arduino Solar Charger

Do you think there is a great alternative to the current solar charger? Today, there are many DIY Solar Chargers that are alternatives to the current commercial products. Do you think there is a better design for a solar charger that is not run by an arduino?

Topic by hthnc-student   |  last reply

Tips / Tricks Section

It would be good to have a TIPS/TRICKS category.  Sometimes i have some good info somebody else might be able to use. Not enough for a full Instructable. Its a tip/trick that doesn't take a lot of explanation.  Example ible.  I was forced to add more pictures just to get the ible to publish. I suppose those additional pictures help, but not really needed for this particular tip to be valid. So i suggest a TIP/TRICK section or something along those lines      

Topic by WWC   |  last reply

Revolver pictures

Hey everybody!  I going to make a revolver replica...thing.  I need pictures.  If anyone has pictures of a .357 magnum next to a ruler along with the cylinder,handgrip,barrel? I need the dimensions of everything,and length of barrel,cylinder,gun overall I need mesurements that you would give a gunsmith. Thx                     -J Ps:its for a half life project ;)

Topic by builderkidj   |  last reply

Arduino based Alarm Clock that uses 5-Senses!

Hi.   We want to make an alarm clock that uses all five senses to help wake you up.  However, at the moment we are just focusing on three of the five for our prototype; sight, smell, & sound.   Does anyone know of similar project that use an time-activated scent release system?  This is the part of the alarm clock that is giving us the most trouble.  Or even better--has anyone heard of a project similar to this where all five senses were used?   We really need some advice on the process and the technical portion of the prototype.  Any ideas, links, tutorials, pictures, diagram, blogs, articles--they could really help!   Thanks.

Topic by hthnc-student 

Arduino motion sensor camera

How do you connect the camera to the arduino at all? & how do you connect the camera to the motion sensor & make the sensor trigger the camera's on/off settings?

Topic by hthnc-student 

DIY mini heating element

I have a container (8cm by 8cm by cm) to store powdery food. But the food gets clumped together to the container walls. As such, I am thinking of coming up with a mini heating device to keep the container warm to prevent the clumping of the powder food. Am quite noob to this and would like to hear suggestions and ideas to come up with a simple diy device.

Topic by kurtselva   |  last reply

Print data to thermal printer using arduino

How can i print or display data on the thermal paper using thermal printer and arduino? what command should i use bec. the serial.print and serial.write doesn't work, nothing happens.. here is my sample code in arduino. void setup() {   Serial.begin(9600);   delay(1000);   Serial.print("Hello"); } void loop() { }

Topic by poohspongebob   |  last reply

Detect a touch to the threads

Hello. I have a lot of threads stretched vertically. I want to detect the touch them. So that you can then play them like a guitar for example). What is the easiest way to do it (detect touch, not to make a guitar)? What kind of sensors could you recommend for that?

Topic by oleinv   |  last reply

Twitter powered toy grabber

Hi I work for a social media agency in the UK and am working on a project with a client that need some help on.  The idea is to create a toy grabber that is powered by tweets. Probably using a traditional fairground grabbing claw and hacking it some way using Arduino to take commands from Tweets. Does anyone think this is feasible and if so how it could work.  Also if anyone fancies taking up the challenge for a fee or just for kudos ;-) Look forward to hearing from you D

Topic by Dunkndisorderly   |  last reply

Where can I get a cheap AVR programmer

Hi, I'm working on a project and am wondering: Where can I get a cheap AVR programmer compatible with Atmega chips? Specifically the ATmega32U4. It does not need to have a socket for the chip, I'll be doing in circuit programming. Please help.

Topic by gimmelotsarobots   |  last reply

LED board ideas?

So first and foremost, I'm new to DIY electronics and the forum, so apologies in advance, i was linked to this forum through google.(if this isnt the correct forum to ask or against TOS apologies in advance.) What im looking to do is make some sort of LED controller, that allows me to program strobe on/off delay (set how long the lights on, as well as how much time between each strobe)  Not too sure where I would need to begin im assuming, and arduino board would be the best start. I laready own a bunch of these (http://www.emazinglights.com/rave-microlights/elite/elite-multi-mode/elite-matrix-chip.html)  I'm just wanting to tinker around and make my own larger scale ones to incorporate into household items, and still have some of the same functionality.  I am not too concerned with size or anything like that either.

Topic by gallandof 

How to make a timed LED

Hello I need help. So I want to make like a bomb timer where there is a count down and then it triggers something. It doesn't have to have a display of the numbers just like I can set it for however many seconds, then push a button.  Thanks

Topic by HavocRC   |  last reply

model Bi-Plane, wing span 1.5M,

Hi All, About 5 years ago my wife started to buy me a weekly magazine which had instructions plus parts to assemble a bi-plane (1930's). It cost appox €600 by the time, about a year, until we had collected the complete set !  I never started the project, every issue is as new, ie;  complete set unopened.  The wingspan is appox 1.5M. Ya its a big plane! If you are interested please make me an offer, say €200 ono. lorcanlive

Topic by lorcanlive   |  last reply


Avengers Assemble! if you liked, hated,(or if your like me) downright loved the movie please fell free to post a comment

Topic by Yami Yugi   |  last reply

Simple embedded point-of sale system

Hi, I am currently thinking about making an embedded point-of-sale system, with a fixed price, i.e. no computer, just a microcontroller that subtracts a specific amount from the card being used as payment. The money would be stored on the card itself i.e. no centralized database. Currently, I do not have a preference regarding the type of card to use i.e. whether to use an rfid card, a contact smartcard or a magnetic card. The magnetic card seems the cheapest, but most examples seem to favor the contactless card. Therefore, I have two questions I was hoping you could help me with: ·         Which media offers the best security against duplication (as the money is on the card itself, I would prefer if the card was hard to copy)? Do some cards have, for example a unique, read-only-identifier, that would prevent any copying (assuming the microcontroller is pre-programmed with those unique ids) ·         Do you know of any example source code that would talk with the card reader, read the amount on the card, subtract a fixed amount and rewrite the new total on the card? For security purposes, some encryption in the driver would be helpful. For the embedded controller, I was considering the arduino, because it seems to be the most popular option (I am a newbie, I will have to learn whatever the microcontroller is). Please let me know if you have any suggestions. Thanks.

Topic by MorrisVian 

Wiring stripboard tracks to common ground

I'm planning a stripboard POV kit to solder with learners over about 3 hours or so, and I have a problem designing the wiring for the LEDs. It's straightforward to use the required series resistors to wire the output pins of an ATMEGA like http://www.arduino.cc/en/Hacking/PinMapping to the anodes of 8 5mmx2mm rectangular leds like http://www.rapidonline.com/Electronic-Components/Kingbright-L-383IDT-5x2-5mm-H-i-Red-LED-Rectangular-56-0398 packed side by side onto 0.1 inch stripboard. However, I'm facing a puzzle when trying to wire the LEDs' cathodes together to ground. It's fairly easy for me myself to do this, just by free-soldering a couple of spare legs directly over the cathode tracks, or chaining loads of wires. However, I can't see myself guiding 45 people through this in a workshop without hassle and errors. Does anyone have a simple way to wire 8 'odd' stripboard tracks together to a ground track (the 'even' tracks have the anodes in them). To give a flavour of the solutions I'm considering, I'm looking into 0Ohm bussed resistor networks like http://www.interfacebus.com/resistor-network-schematic-bused-resistors-sip.html to wire theparallel tracks into a single ground track using a standard through-hole component with legs clipped off. However I'm having trouble sourcing anything like this, and I'm sure others have better ideas.

Topic by cefn 

Arduino 1.01 vs anti virus

So I downloaded Arduino 1.01 from the link provided at the Arduino website and then my anti virus software ate it... I mean, said it was unsafe, malicious and removed it from my computer. Anyone else have this issue?  Is the software safe and my anti virus software (norton 360 2012) just stupid or is it actually malicious?

Topic by AlexHrn   |  last reply

Parallella a new tech

Hey everyone I know this is new technology that could be very promising but it needs help. http://www.kickstarter.com/projects/adapteva/parallella-a-supercomputer-for-everyone I am not affiliated with this project but I do believe in it. If I had any more money I would increase my pledge but that is beyond my means at this time. So, I'm coming to the community. Just check this product out and spread the word however you can. I personally believe that this could be useful for many applications where an arduino doesn't have enough processing power. Plus this device only requires 5 Watts under full load according to elementary test. And best of all it is set to release at less than $100. With the support of the community we can bring this product to market.

Topic by m9365428   |  last reply

My kid broke his arm, is getting a cast tomorrow, should I try to add some LED's?

My 6 year old broke his arm on friday night, they can't do a fiberglass cast until tomorrow. I was thinking what if I prewired an ultra bright LED and ask them to wrap it into the cast with just the led poking out. I was thinking I could decorate his cast to look like Buzz Lightyear's arm with a "laser". The wire could come out the top that I could connect a battery pack to so he can turn it on and off. Is this a good idea or not too smart? I'm trying to think of ways to make my son feel a little better about having a cast for 8 weeks.

Topic by tonythemediaguy   |  last reply

Interested in building a 'remote finder.' Some questions regarding what I would need.

Greetings, fellow Instructable subscribers. My name is Ron, and I am interested in building a 'remote finder.' A little background about myself: I have little to no technical experience with building and/or programming. I am a complete novice. However, I am very eager to learn how to make my own nifty little gadgets. My first project idea is as follows: I would like to make a tiny device that I could adhere to any small electronic device which could easily go missing. Ideally, it would make a high-pitched noise and emit a bright light which would be seen assuming that it was, say, under the couch. It would also be paired with a remote control which could be put on a key chain. I've read through a few different tutorials here involving Arduino and 555, but I'm still not wholly sure where I should begin this endeavor, or how to make the device as small as possible. So, good people of Instructables, how would you recommend I go about creating this device?

Topic by rswar2214   |  last reply

Help needed to install small remote listening device in to a child's battery operated toy

Hi I'm new to this site, I need help in installing a small remote listening device (simcard type) into my child's toy, I already have the device and the toy which I'm going to use, the toy is battery operated, I just want to know how I would connect both items so listening device receives power from toy batteries. Listening device dose have its own power supply but it runs out of power after a few hours. can any one help

Topic by Alik112   |  last reply

Arduino Guitar Tuner

Hi everybody, I'm creating a simple guitar tuner for a project at university. The purpose is just to create a step-by-step guide to it's creation to demonstrate some processes in how they work. Obviously it's going to be more expensive to make than to buy one (unless you happen to own a Taiwanese factory) but it's more about demonstrating some basic electronic principles and providing a basic design and seeing if it evolves with user input. So this is just a general enquiry into community interest. Comments and ideas welcomed. Cheers

Topic by Remulos   |  last reply

wirless router

I really bad wireless and i was wondering can a apple wireless router work on a ps3?

Topic by crazybanana   |  last reply

Is it possible to wire two LEDs to a dimmer switch?

Hey guys, Just wondering if anyone know if it is possible to wire two LEDs to some form of dimmer switch. I had one knocking about the shed, but it's house hold with a minimum of 40W ... which is way more than what I need, plus I'd like my setup to be battery powered. I was wondering to kind of, hobby style dimmer switches exist? I quick look on Ebay showed that most LED dimmer switches are wall mountable, and really more for LED bulbs or large strips. Anyone have any ideas? Cheers!  Clare

Topic by codename-3c   |  last reply

Reversed Bias Diodes?

I really want  some clarity on "reversed bias diodes" whats the point of having a reversed bias diode? when would a person want to apply it to a circuit? if current can't flow through it, wouldnt it just mess up the circuit? Please shed some clarity on this subject for me, it would be greatly appreciated! -Grizzly

Topic by Grizzly_Bear   |  last reply

AM Radio Reception

Any one know how to build a super antenna for pulling in AM signals from far distances i live in the boondocks and AM radio reception is lousy at best i've tried rigging up standard wire antenna and wound my own various contraptions nothing seems to pull the signal in stronger it comes in fair during the day but at night almost nothing but skipping and noise ... Any Suggestions  Thanks

Topic by fretted   |  last reply

Making HDD Player Circuit

Hi, I have my 80GB Old Hard Disk, which i need to use as HDD Player to connect to tv using AV Jack. Is there any Simple circuit to build this ? Thankyou

Topic by harismvec   |  last reply

how to make a adapterter from vga to s-video

How to make a adapterter from vga to s-video

Topic by tazmanaz   |  last reply

searching for a pump that can handle pudding

I dug through a few forums, trying to decide which this was best suited for. I settled on tech since its a physical computing project. I'm looking for a resource for a water pump that can handle something like pudding. the initial thought was use an air pump and a bag or maybe have the bag be squeezed closed but i need it to cycle through.  Like a water fountain of pudding! The pudding spurts out, then there is also an intake which is recycling the goop. Does anyone have a resource on pumps which could handle something so thick?  (and since its a small scale project, cheaply and small!)

Topic by gjclimer   |  last reply

Laser rangefinder

Hi, I would like to put together a laser rangefinder, with LCD display, that can measure distance to the objects out to about 600y, with accuracy of +/- 1 y. I know absolutely nothing about electronics. Can somebody tell me what components would I need? regards, dejan

Topic by COROVICD   |  last reply

Camera Battery hack : Need some Battery expert advise

Hi All, I have a Underwater camera (which is now going to become the backup) However the battery is only 710 mAh. This works out to 20 mins of video or about 2 dives of photos. Original battery : http://www.adorama.com/SSNP40.html Battery  Lithium-ion Charge Time  1.5 to 2 hours Output Voltage  3.7v Capacity  710 mAh But as the battery is so small and useless, i want to open the camera and soldier 3 wires to the battery connectors and add a 3 pin connector. As course there is space within the house to place a new battery, IF the right size and shape can be found. However, i dont understand batteries... Is it safe to add a bigger capacity batter as long as the output stays the same(volts... as i cant find the Amp output) I found this battery, looks like it might fit in the house http://uk.farnell.com/panasonic/pa-l2/battery-li-ion-1s1p-3-7v-1-95ah/dp/1900165 But i am just not sure if this will work??? Any ideas, tip or advise welcome. Thanks

Topic by rwishart 

Walkie talkie mic and headphone 3.5 mm sockets

Iam wondering if I could get two walkie talkies (2 way radios but I prefer calling it walkie talkie) and add two 3.5mm jacks one for ear phones and one for a mic.  Using a splitter 3.5mm for the sockets, a 3.5mm mic and a 1m extension  for the mic so I can put the walkie talkie in a pocket. Can someone tell me if this will work please and any suggestions for improvements to my plan 

Topic by Ojsmudge   |  last reply

Can someone convert this schematic to bradboard???

Hi everybody this is my first post. I am getting into electronics and I am no good at reading schematics. I was wondering if anyone could convert this schematic to an eagle eye breadboard view. Any help would be really appreciated. Thanks :) LINK TO SCHEMATIC: http://img63.imageshack.us/img63/9819/djmixerappended.jpg

Topic by graphitepanther   |  last reply

Wireless in house works fine on laptops but not on phones?

Up until maybe a month everything was fine, then all of a sudden when people connect their phones (iphones/samsungs) to the network in the house it just doesn't work. The connection for laptops/ps3/xbox are fine but it just won't work on phones.  No settings have been changed.  We're using a Netgear N600 wireless dual band router.  Anyone have any ideas on how to fix it? 

Topic by MadMardegan 

Looking for a cheap and easy project for a beginner

Hi :) Next year, I'm planning on starting a Mechanical Engineering degree. I want to get some hands on experience with making stuff just as preparation, but I've never done anything like this. What's a good place to start? And something that won't cost a lot as I don't have much money? Any help is appreciated :D thanks

Topic by mheywood   |  last reply

Newtons Cradle

Is there anyway anyone knows how to build like a robot kind of thing that with a push of a button moves your newtons cradle and if possible can you make it do a range of tricks?? It would be awesome if i could Looking Forward to responses Thanks!

Topic by unknownusername2702   |  last reply

wireless electronic device

I am looking to build a device that can communicate with a phone and through that phone you could turn on or off a light or a siren with fairly long range 20 to 30 meters (60 to 90 feet). Would anyone be able to help regarding this device. I am looking for it be as small as possible. also i wanted this device to run with fairly low voltage dc power source. please help with this  thanks

Topic by sam501   |  last reply

How to wire a reverse polarity switch

I have an old Rascal 600 scooter that has a seat actuator that will go up but not down. I have tried to find the problem but can't.  It will operate up and down early in the morning when it is cool but later after it warms up it will only go up. I want to wire a reverse polarity switch directly from the 23VDC system(2-12 volt batteries)to the actuator motor. The actuator motor is 24VDC 12.5 AMP. It has a compression load of 600LBS. The motor has a black and red lead. Please include the size or sizes of wire I will need.  Also please be as specific and simple as possible. A drawing would be especially helpful. Thanks a million and God Bless!

Topic by themanpan68   |  last reply