Need a partner for Peltier type project to chill liquid. Medical Device. Cash Compensation

Need a partner for Peltier type project to chill liquid. Possible prototype for a Medical Device. Cash Compensation. I am in Toronto. Not a scam.

Topic by dnicol1   |  last reply


How to convert 120VAC to 90VDC @ .5amps?

Hello, I'm looking for a circuit the will convert 120VAC to about 90 VDC at .5 amps. If anyone could suggest a schematic or point me in the right direction of one that would much appreciated!

Topic by bigjohn412   |  last reply


Chinese laser cutter repair

Anyone in Boston area able to provide or know of a source for service for these chinese made machines. We are a public high school, with an 8 thousand dollar 80 watt co2 paper weight.

Topic by GeorgeF83   |  last reply


How to harness the energy in snow

I found a thread that asked this question previously on instructables but the author wanted to harness the kinetic energy of falling snow, and many of the criticisms involved the unpredictability of when snow will fall.I am specifically curious if it is possible to create a machine to remove snow that uses the energy of the snow itself. Ideally, it would melt the snow and use the water or steam to power itself.The things Canadian winters do to the mind...

Topic by shareefhadid   |  last reply


Old Tv Speakers and Subwoofers

I have an old sansui tv, but ijust want to use its 2 speakers and 2 subwoofers, i means to convert it to only sound system, please help

Topic by dpokharna   |  last reply


Hp or Gateway Laptop?

I want a laptop but there are about 2 that are neck-and-neck in my decision.There's this HP which i really like its design and appearance and also the hardware inside it.http://www.walmart.com/catalog/product.do?product_id=9720310#And Then there's this Gateway which has a tiny bit of more parts like a different graphics card, larger hard drive, built in webcam, and lightscribe (not really concerned about these parts).http://www.bestbuy.com/site/olspage.jsp?skuId=8771297&type;=product&id;=1203815723402And I'm pretty sure i want the HP (more trusted brand in my opinion), but i just want a second opinion.

Topic by Caveman477   |  last reply


Getting help for an instructable

How do I get help if I am trying to build what the instructable is explaining and the creator of it is not answering?https://www.instructables.com/id/Easy-Project-Benc...Could someone else answer my questions?

Topic by fletch2770   |  last reply


Arduino

Looking for someone to write an arduino sketch for a stepper motor driven XY table Only looking for a basic, simple code Willing to pay but willing to accept volunteers also :)  Thanks!

Topic by PhillipF9   |  last reply


Cleaning the oil for a vacuum pump

Was too lazy to do an Instructable about it and think a lot of pics or even videos won't help much if you know what I mean ;) Some of us use rotary vane pumps not for the purpose of evacuating refrigeration systems but for all sorts of fun and experiments. This means quite soon or often we face the problem of the oil taking in a lot of water or even worse particles and solvent fumes. I don't know about you but I was getting sick and tired of replacing the expensive oil every few weeks or sometimes even days if something got too wrong. There are many different blends of compressor oil out there that will work very well in our rotary vane pumps. The main difference is whyt the oil is designed for. Some are perfect for aircon systems, others for the work with solvent fumes and there are even those special oils that bind moisture. Unless you really need to evacuted special gases or solvents basically any low viscosity oil will do us just fine! So instead of paying 20 bucks for special compressor or even vacuum pump oil we can select the cheap everyday oil. Well, not exactly... We also want to be able to recycle our oil to save even more money. That means we don't want an oil that binds to water to keep it out of harms way. We also don't want any oil that has special coating abilities for example these oils claiming to reduce wear and tear on your engine. But any other low viscosity mineral oil or if you prefer synthetic oil will do - just stay away from silicone based oils!! If you have not used your pump for a few days you can often see a slude at the bottom of the viewing glass. If the rest of the oil is clear you can simply drain this worst bit and top up with fresh oil if required. This simple procedure saves you a lot of oil already, at least if your pump has some rest every now and then. Once your oil looks wasted it is time for the recycling and cleaning: Release the oil into a high glass jar or these facy spaghetti glasses. Fill with fresh oil and give it a short run. Release this oil as well and wait for it to properly drain. You now have the inside of your pump nice and clean again, time to fill one last time with fresh oil to keep using the pump. The filthy oil we now have in our jar should be covered with some fine cloth or filter paper and placed somewhere warm. After a week or two the oil, filth and water will have seperated and you pump, drain or siphon out the now clean oil for further use. Don't be too exact here trying to get all the oil out, just remove what you can without risking to suck in the filth from the bottom. Simply leave the rest in the jar and add the next oil change to it for the same recycling process. Solvents.... In some cases we will work with solvents and that means the oil might bind to them. Acetone for example is quite nasty here and can change the oil itself by breaking down certain components. In most cases it means the viscosity will be reduced, which is not really too bad for us. What is bad however is the fact that these solvents often refuse to fully seperate or evaporate. Once the oil looks clean do a smell test and if it smells like solvent then for sure there is solvent in it. Next step to confirm is to do a lube test. Simply place on some smooth metal or glass and smear it with your finger - a drop is enough here. If it feels sticky on the surface, gives you a rubber like feeling when sliding over the surface or is far less "slippery" than the fresh oil you also have a problem. I found that filling this contaminated oil into a proper container and applying a strong vacuum will remove all solvent residue in a very short time. Downside is that the oil in the pump is contaminated again, so it pays off to collect solvent contaminated oil seperately and once you got enough for several refills use the pump to get rid of the solvent. When done do another smear and smell test, if still smelly repeat if no longer smelly but still the same bad feeling on the surface: Discard as the oil might be broken down by the solvent.

Topic by Downunder35m   |  last reply


Trying to make a turret with stepper motors, limit switches, and a joystick. I would like some help if possible

Making a turret that runs on four stepper motors to turn it 360 degrees. than one stepper to tilt the gun up and down, which has 2 limit switches and has a door lock actuator to fire the gun. all of this ruins on a 4 position joys-tic with a button to fire. trying to have this run on an Arduino Uno if possible. would need help coding and figuring out the wiring

Topic by Sweetcorn_18 


Wanting to design a cree led powered dock rechargeable torch running on 18650 cells

Hi all, I had an idea the other day that it would be very useful to have a powerful torch in my van that is kept charging in a dock all the time (as required at least) when the engine is running.I know I can get similar torches that charge via a USB cable, and that I could plug the cable into a cigarette lighter socket etc, but what I would like to do is as follows:Power from a 12v (ignition switched) source in vehicle, to a charging dock.Torch must be powered by 18650 lithium-ion cells (2 ideally).Torch would run a cree (or cree style) powerful LED chip/diode (maybe up to 10w arbitrary power).Torch does not need to have a wire plugged into it, but can be simply placed into the dock after use in order to resume charging. The connector for charging is not important but likely a jackplug type arrangement, or else spring terminals.Housing will be 3D printed, and using a lens from an existing torch (probably).So mostly I'm happy about making and designing this, except that I'm not certain about what setup (either the circuit design if bespoke or what off the shelf module etc) I should use for taking 12v to charge 2x 18650 cells in situ.I have got small USB charging modules already, and I have things like voltage boosters/reducers, and tons of electronic components, but the USB charge module is no use for using with a 12v supply etc, so I'm not sure how to best address this part of the project.If anyone has suggestions on good ways to accomplish this I'd be really grateful, thanks!

Topic by Mr Joshua   |  last reply


'Car FM transmitter to spy bug'

Hello, i am looking for some tips on how to transform an FM mp3 transmitter to a spy bug.. i have that transmitter you plug into the lighter in your car, put an aux cable or an usb in it, and it then trasmits to a set frequency so you can tune in with your radio.. i was wondering would it be possible to just get rid of the jack, and solder a microphone instead? If not, how would I go around that?

Topic by dsirotic   |  last reply


Raspberry Pi: Launch Python Script on Startup

Hello sir, Running Python script at boot works fine with crontab, only thing is that I am stuck to it. How to come out of it ?How to stop it. Cntr+C does not work

Topic by dgkanade72   |  last reply


Display issue for edited IBLE

I added a step in the middle of a published IBLE, and the step shows fine in the editing screen. When I go to the IBLE, the pictures are in the right order, but the text is missing from the new step and all of the text for the steps are now out of sync from that point forward. Is there a way to correct this?

Topic by Lorddrake   |  last reply


Contest banner missing in some accepted entries

I have two different contest entries that have been accepted and they show up on their respective contest pages, but the voting banner is not displaying inside the instructables.https://www.instructables.com/id/Mushroom-Powder-L...https://www.instructables.com/id/Ender-3-Pro-Initi...This appears to be a sporadic issue since two other contest entries that were submitted around the same time in different contests have the voting banner displaying properly.https://www.instructables.com/id/Chocolate-Eclair-...https://www.instructables.com/id/Making-a-Tripod-Q...

Topic by Lorddrake   |  last reply


GBA gamepad for Anyphone,Can any one made it?

I have a idea about GBA gamepad for phone,it can fit any phone style,no power needed,no bluetooth needed,just physic touch extend,the key button is conducted.

Topic by panda1987 


Pressing any one button clears any other that was on.

Hai,I am trying to recreate a control panel that is a row of buttons where only one button can be pressed at a time. Pressing any one button clears any other that was on. Can anyone help me by providing logical solution through hardware components or circuits. I can do it by coding but i want it by hardware circuit. Thanks & Regards, Chandana.

Topic by chandanachandu   |  last reply



Login troubles

Running Win7 64 ultimate, using FF in the latest version.I noticed that the login information somethine seem to get lost.When trying to reply I get messages stating I need to be logged in to do this.Trying to check my inbox ends in a loop where the page tries to find content.Manually logging out and then logging back in fixes this.

Topic by Downunder35m   |  last reply


In over my head - pH automation

Hi all,I'm in need of help. Due to my previous jobs and general knowledge a friend has asked me if I could build an automatic pH regulation system that will monitor and maintain two tanks (it sounded easy to me at the time) but I've suddenly found myself out of my depth.Having spent long evenings searching on the web and on here, I've seen a few builds of monitors and a couple of dosing systems but none are just what is wanted as they are only set up for single tanks, or not combined into an auto-doser, or too "over-tech'd" or multi-purpose orientated and I don't have the knowledge to adapt or alter things to my requirements. Plunging straight in at the deep end with no real idea of what I'm doing and can actually be done, I'm thinking I should be able to (theoretically) assemble and program an Arduino controlled system, with the one box doing the job of monitoring and regulating both tanks independently, so two sensors, pumps etc., from what I gather it's by adding different boards to the base unit (I did say I know nothing). I don't need wifi or anything like that, just a simple device with a basic display showing the current values that will sit there and just do the job.I think I have the capability to actually build and program the thing having a background in electrics and a little knowledge of relay control systems - not electronics, I start getting lost just after the transistor/diode level and BASIC is more my programming level (yes, I may be THAT old, but I'm still trying to learn), and so what would really help me is if anyone out there can point me towards a site or pages where I can find the info I need, hopefully that doesn't assume years of prior experience, to either build or adapt something to what I want, or even aim me towards someone who could be able to supply me a design and components list, either for fee or free. Cheers!

Topic by hobbit590   |  last reply


Arduino display in lcd the battery level, battery charging ,beep when lowbat and full charge from a external 12v supply

Please Help how to do this. arduino display the battery level, battery charging ,beep when lowbat and full charge in lcd from a external 12v supply

Topic by ChrisM990   |  last reply


Code for website

Which programming language is good for making websites like https://errorcode0x.com/resolve-steam-error-code-80/ ?? Please suggest me.

Topic by zikkij   |  last reply


Replace mechanical switch with electrical switch or replay

0I have a remote controller for a portable heater, and working on a small project to be able to control the fan on/off from an arduino with Bluetooh HM-10 module. I thought a solenoid might work by mounting on top of the remote but it doesnt have enough force, I want to remove/desolder the mechanical button and figure out a way to control it without the switch but kind dont really know what circuit I should use, kind of just learning how to use arduino.Images of remote and button traces below.Any idea how I could wire this up to arduino via some switch/relay circuit? Any circuit design / schematic would be helpful(See pics attached)

Topic by hydrocarbonz   |  last reply


How to battery power a PC just like a laptop?

I'm wanting to battery power a PC but don't know exactly how to assemble it, here are the parts that i plan to get.My PC is going to draw roughly 150w, i would like it be charging and usable at the same time just like laptopbattery:https://hobbyking.com/en_us/turnigy-high-capacity-...PSU:https://www.ebay.co.uk/i/182249128437?chn=psCharger: what charger should i get?Don't know

Topic by OTKZuki   |  last reply


Programming

Just looking for some good Tech Resource books that go from basics to beyond.... Any help would be greatly appreciated.

Topic by Cheshir_monkee   |  last reply


Need help designing an auto mister with a servo

Hi All,Let's begin with this. I've never built much of anything in my life. I just had this idea I wanted to run by you in order to see how hard it would be to make.Each night before bed I turn on my fan right next to my head. I love the sound and the feel on the breeze. I want to know how hard it would be to place a water mister in front of the fan in order to feel like I'm out in a light rain.I found an inexpensive mister on Amazonhttps://www.amazon.com/Instapark-Operated-Gardenin...and I thought of placing an auto rotating (every 5 to 10 seconds) servo on the button. Let's make believe I'm a plant and I'm trying to water myself.How hard would this to be?Steve

Topic by CheapToad   |  last reply


Is it possible for the Arduino to execute a Neopixel strip animation while simultaneously playing some type audio effects?

Hi,I have my Arduino mega connected to a 84 pixel Neopixel strip with an IR proximity sensor monitoring a basketball hoop. When the sensor is triggered the program executes a Neopixel animation. Simple as that. My question is:Is it possible for the Arduino to execute a Neopixel strip animation while simultaneously playing some type audio effects?

Topic by LEDLIT1 


Freeform/ Deadbug/ flywire circuits

I've been getting into diy electronics and awhile ago I discovered Freeform (aka Flywire aka Deadbug) circuits and was immediately enamored. Recently Hackaday ran a Circuit sculpture contest, and there were some really great submissions, including The Ring Of Lights, 430man evolution, and one of my favorites, HYPNO-BUTT! VIEW THE REST OF THE HACKADAY CIRCUIT SCULPTURE CONTEST SUBMISSIONS HEREThis had me wondering what other works of art are out there waiting to be admired. I'd love to see any circuits of this sort that anyone might have or know of.

Topic by SaintSkinny51792   |  last reply


My last instructable is not showing up in recent section

Yesterday, I posted a instructable in Technology section under Arduino channel. The public link works, but it is not showing up in recent as well as in search results. Here is the link - https://www.instructables.com/id/DIY-Digital-Clock-With-7-Segment-LED-Display/. Can anyone address this problem and suggest what I did wrong there? This never happened before to me.

Topic by Being Engineers   |  last reply


Electrical schematic help/wiring + arduino programming

Hello,first time user here, so i would like to just apologize for the wall of text that's coming up.Im trying to build this little enclosure here https://www.instructables.com/id/Touch-sensitive-... and i have a hard time understanding the basics of the electronic schematic thats invovled, when he shows how to build it. Nor do i truly understand what components are in it, hence why i cannot determine the price of this build (based on electronics). So i was wondering if anyone could lable one component by one for me, aswell as how to connect them all together? so that i could calculate the pricing and see how much it would actually cost. Seccond thing is that i wanted to change it up a bit, and use neopixels, or ws2812b led strips instead with a teensy 3.2 and fastled library code, for that fiery effect. Thought that might look really cool. However im concerned with the power draw of these ws2812b led strips. Getting information from adafruit: 60mah per led at maximum brightness, but thats eye blinding, so a 20mah per led is more logical, as someone with neopixels wouldnt be running full white anyways, and more colorful setup, or patterns. Im able to get 144 led/m quite cheap, but then the power draw of just 1m is a whopping 8.64 A. Which is starting to sound pretty dangerous at 5v. But then again, im not buying neopixels to run at full white brightness, i want the patterns. Im wondering if there is any possibilites to make a admin command or a priority list or something to lower the brightness of the strip entirely without messing up the code? i know regular leds have ir remotes to dim the light. I mainly just want the red flame effect, which is only 20mah at max brightness and a peacefull 2.88 A, but i also want white light + i want the safety of knowing i can supply the strip of the power it needs, just incase. The video with the code is underneath: (code in video desc)and i know 144 leds/m is probably overkill, but then again, im getting them dirt cheap, + it would give off a much better fiery effect than a 60 leds/m or even a 30 leds/m thanks in advance for any replies, and sorry for my wall of text. :)

Topic by karminderb 


How to combine 2 audio signals from HDMI

As I've known so far there aren't receivers that mix audio.I want to mix 2 HDMI sources, lets say 1 is a PS4 and second is Xbox One, how would I mix them in 7.1? Mix the 2 audio sources into 1, is there a way of doing that? What is the simplest way.I know that there are stereo mixers, but haven't heard of a HDMI one.What is the simplest way of mixing both signals?I think it might have something to do with modulating the signals, but I dont specifically know how modulators work.

Topic by MatanY2   |  last reply


Need a table top that can push stuff upp in the air

Okay so i need some help with a prop for a photographing stuff in mid air.I need a device (flat surface) that I can place objects on and it will shoot them up in the air.Imagine a bowl of popcorn or a pair of glasses with water in them flying up in the air etc. I will then have sensors that will trigger the camera at the right time. (these devices and system I already have)My dream would be to be able to control this "jump table" device thru a simple solenoid valve. (12v) So my rough plan is to have to sheets of wood 40cmx50cm about 1cm thick.Next is to have a pneumatic cylinder in between these two that will push the top plate up and down.I probably need some sort of guides in the corners of the plates so it moves correctly.The pneumatic cylinder will be controlled by a solenoid valve, the solenoid valve i hope to turn on/off with a 12v power supply. The easiest solution for air source would be a co2 cartridge.But if that's to much pressure for the components maybe a cheaper air compressor in a smaller size is usable ?So what im looking for in general advice in terms of pressure and pneumatic cylinders, which i do not have any experience with.This video pretty much has the basic components i need i guess ?Any general advice what to look out for when choosing components and air source ?Thank you!

Topic by PaulL320   |  last reply


HP, Lenovo, ... Laptop Bios update boot loop fix

I had to install Windows on an older HP laptop today.And being the nice guy I also updated the Bios to the latest available.Now these Windows tools for this job are great fun, start it, press a few buttons and all is updated.Well, until you realise the thing ends in a constant bootloop going back to the bios update part created on the recovery/backup partition.Going the official way by asking the support is pretty much useless as my searches only came up with copy and paste answers but no solution.Some people got desperate enough to order a new bios chip, program it and solder it in :(But the fix is sooo easy and obvious that it might take a little kick to realise it ;)I assume you downloaded the right tool and bios update.For HP and Lenovo it all comes in one pack anyway.I also assume the tool stated that all went fine and the backup and update were done correctly.Now the boot loop that you experience is actually on purpose ;)You are required to enter the bios - for my HP it is the ESC key, then F10.Here you load the defaults, then adjust what you need - like the boot order.Once you set the boot order to the internal HDD or the OS boot manager you are good to again.I hope that will help the desperate people that got nowhere by trying the support for their laptop ;)

Topic by Downunder35m 


Help for a project

Goodmorning everyone I am not very practical in this field, but I would like to know if it is possible to carry on this project and if someone can help me to develop itInstall IP cameras I want to create a card that powers a 47 v LAN port from the USB port of my PC so that the data cable can both power the camera and receive the video signalsI would need something like that in the picture even if it comes out bigger is not a problemthanks everyone in advance

Topic by danieleb38 


LED Strobe Light circuit, Best Place to ask the experts for L.E.D. Based Strobe Driver circuit

Iam new here, after searching on google and many electronic forums and all, I still can't find a LED Strobe light circuit, which would run off a 12v dc Car Battery.You Tube is loaded with lots of people displaying them, but can't find the circuit to make one for me.check what i want the LED columns to do for me.http://www.youtube.com/watch?v=O_FCks1c6E4orhttp://www.youtube.com/watch?v=sE6JZ9fPVqEorhttp://www.youtube.com/watch?v=u7kf1MnJ2R8Please help me with this, Iam a L.E.D. Fan and can't sleep, i dream of strobes and can't find one, huh.I've some Mods done to my car lights, I'll make some videos and share them with you all here soon.Thanks for your time :-)

Topic by ghpk   |  last reply


Portable media build parts question!!

I'm looking to build a portable gaming and media station but I'm stuck on a couple things and am hoping people here might have some suggestions and/or links. Basically, I bought a large aluminum camera case, big enough to hold a 22" led tv in the lid. I am going to mount the tv in the lid, thinking of just drilling the holes and mounting the tv directly to the lid. Any critiques or problems with that would be nice.https://showbox.red/ https://downloadnox.com/ https://downloader.vip/vpn/

Topic by achanakbhayank 


How can I turn on old tv zoom lens into a telescope

I have acquired a couple of tv zoom lens from canon tv station cameras. Does anyone out there know of a way to turn them into a telescope. Or ad a camera back attachment. It seems like a waste tossing them out. The lenses are fine, btw I'm cheap!

Topic by cbucci   |  last reply


Suggestions for a beginner project bike?

I'm jumping the gun a little bit here, but looking ahead to winter and the off season, I want to find a cheap project bike I can tinker with. I have some mechanical inclinations, but it will be a bit of learning curve, so I want something that's pretty accessible and relatively easy to work on for a beginner. I'm looking for a cruiser anywhere from 250cc to 500cc with minimal bells and whistles. Lay those suggestions on me. Showbox Tutuapp VidmateAlso, what are some red flags I should look out for that are going to end up giving me nightmares? I want a bike I can work on and learn with, but I'm definitely not looking to do a complete rebuild.

Topic by popchau   |  last reply


Push button duration measurement inside FPGA

Hello, I need to measure the time between press and release a button in an FPGA (time between rising and faling edge) and dispaly the time result the seven segment dispaly of the FPGA , I do somethink but it doesn t work , can any one help please or give a program ,????

Topic by mirabelle275 


Try me Button

I got a few of those Try Me buttons off some Halloween things I bought, are they a complete waste or is there something you can do with them?

Topic by thatjawn   |  last reply


Correct crossslot for NAS and MS screws?

Do anybody now the correct crossslot standart for NAS (National Aerospace Standard) and MS (Military Standart) screws? is it Phillips? Frearson/Reed/Prince? JIS/JISC? or any standart else?

Topic by 1Bln65 


Convert jam khm600 haze machine to wireless

Hi I have a Kam KHM600 Haze machine which currently has a wired controller. I would like to convert it to wireless operation. Does anyone have any advice on how to do this?

Topic by Chrisg54 


How do I make a power indicater light for a bluetooth?

I have Bluetooth headphones, & I'm modifying them. I want my Bluetooth to light up tow external LEDs when I turn the device on. I can't wire a line to the micro LED, its to small for me to solder. I was thinking wiring the External LEDs to the Bluetooth's battery. Is there a way to make a simple connection from the battery, to the external LED wire & back to the circuit board, so when ever the Bluetooth is switched on, all the external LED is indicating is the power going to the circuit board?

Topic by elkaddalek   |  last reply


Top 100 Instructables of 2018

Here's a look back at the 100 highest-viewed Instructables published in 2018. It's a fun collection full of inspiring, clever, and educational projects. Be sure to take a look:Top 100 Instructables of 2018Thoughts, comments or observations are welcome below!

Topic by seamster   |  last reply


Call for videos!

Aka How to receive feedback, get featured, and be awarded internet fame + more!I know it's been a minute since I've put a post like this in the forums, so allow me to (re?)introduce myself.Hai!I'm audreyObscura. I love making stuff, playing with cameras, petting dogs, and eating pizza. I've worked here at Instructables since 2012 doing a little bit of everything, and I solemnly swear that the best thing about working here is getting to learn something new every day from amazing community members like YOU!These days, a good chunk of my time is spent queuing our posts on social media platforms and boosting Instructables authors that use Twitter and Facebook to share their projects. (And finding the perfect gif to reply to Twitter threads, I'm very good at it - try me.)I'd love to start featuring more videos and gifs on our channels, but need a little help from the community. We are looking for media to help give YOUR INSTRUCTABLES a boost on our social media feed! What we'd like to receive:Great, high quality, short-form videos (under 1 minute) GIFs! Under 3MB preferred (bonus points for perfect loops)Examples: What we don't want to receive: YouTube URLsProjects hosted outside of Instructables.com What you'll get out of it:Momentary internet fame and all the warm and fuzzies that come along with community recognition!An Instructables Author Thank You pack in the mail which includes our super sweet Robot Stickers, an idea notebook, pencils, and a super fun enamel pin!Feedback! We want to work with you and coach you through making great feature-worthy content. If you share something that isn't quite up to our snuff to post to our channels, have no fear, we'll still send you a little gift AND let you know HOW you can improve your content!If you go above and beyond, maybe we'll send you something extra too, so impress us! Send your vids to this email address!Have you already posted an Instructable with a great demo video or explainer gif? Drop us a link in the comment section below and we'll review your project to see if it's a good fit for our social media feed!Lastly, I wanted to leave this post with some inspiration and some skill building tips to get started. Hope these help: How to make a gif How to turn movie clip into a gifPlease comment below with any questions you may have, and I can't wait to see what you share.Thanks!-Audrey

Topic by audreyobscura   |  last reply


Using a hall effect sensor with TL494 pulse width modulator.

I have an electric billy cart with a dead controller board. I constructed the kit circuit below to replace the dead board and it works well enough for the job except for one small problem. The throttle on the billy cart utilizes a hall effect device and not a pot. The billy cart also has a handbrake with a switch that closes when applied. I use this with a resistor to discharge C2 and pull pin 4 (inhibit) high. This ensures a gentle start (as the capacitor slowly charges through the 100k resistor) if the brake is released with the throttle advanced. The output range of the throttle is 950 mV to 4.1 V if VREF (5V) is used as the supply. (I'm dropping it in in place of the pot.) 4.1 V is sufficient to achieve the maximum 90% duty cycle of the chip, but 950 mV leaves me with a minimum duty cycle of about 21%, and of course a motor that won't stop. Will changing the divider ratios 20k/2k2 & 47k/47k be sufficient to get me zero speed or am I going to have to do something more exotic? Thanks in advance.

Topic by Rasputin182   |  last reply


How is the wearable battery designed to last longer?

The kicker now is that your smartphone holds far more information than a pocket ever did, How is the battery designed to last longer?

Topic by EvaW23   |  last reply


The future of mobile operating system or the end for "hackers" and rooting?

For mayn years it was almost logical to get full root access on your new smartphone or tablet.The other fraction might now it as "jailbreaking"...No one really needs it unless they are not happy with they way the mnufacturer designed the operating system and features.The removal of bloat, apps the user never needs, is still the most common reason for rooting.Custom ROM's offering a different experience are right behind.Now we also have TV's, entertainment boxes of all kinds, even from our ISP's directly.The main provider for the operating system is now Google with only a few "competitors" left.Apple has a strong hold of the mobile and tablet sector too but is not really presented in other areas.Android is still open source but Google heavily modifed it to suit the needs of data collecting and security for features like banking, access control and so on.What is good for the normal user and perfect for those with security in mind can be really bad for those actually just using a device.No matter why you buy a new phone from your provider, you almost never buy it for the added apps and services.Rooting has become more and more difficult.One reason of course is constant security updates and removing possible access options for even simple things like getting USB debugging and an unlocked bootloader.People dedicated to find ways to remove provider locks, creating custom firmwares or the basic tools required to work with firmwares were called hackers.If you buy a new car and decide to modify it with a new engine, seats or whatever than no one will stop you.So why don't we have the same rights for our electronic companions?I wouldn't call it hacking, I would call it actually owning and controlling your device instead of Google letting control you - or Apple, but who cares....The other reason is dead simple: Those guys who started it all have retired or found employoment with those they fooled for so many years.Chainfire should ring a bell for anyone ever concerned with rooting.The master is gone now and only a few people are willing to take his legacy.For Asian devices the community over there is better off but for our market region right now Magisk seems to be the only option left for modern devices.The sneaky ways to lock us out....Security comes at a price, simple as.You can offer secrity for money transfers if the device is not trustworthy.Same for online streaming - you want the money for what you give and prevent that someone is able to make unwanted recordings without encryption.The list goes on with access control system and literally everything we use our devices for that involves some security.Even with the lates PIE systems Google's own devices are still quite friendly in terms of gaining root access.Different story though if a manufacturer makes full use of all the latest addition at Google's disposal.Device security no longer starts with the boot we see.It is now possible to create a hardware based tree of trust.This means any modification to anything will cause a failure.This locks out all "tools" able to read out partitions and vital data while a device is in fastboot mode.And of course said fastboot can be fully disabled as well now.For security reason a so called A/B configuration is used.Updates come over the air and are applied to the dormant system.Next start will boot the new system and then update the old one, no requirement to manually apply and update.The recovery can also be abandoned and replaced by a system using a copy on the device itself that is updated through OTA updates with the firmware.So both ways to gain official access can be full removed from the user.From there we get encryption, hash checks and literally everything working in its own user space - a full SELinux enviroment at the highest level.There are already devices utilising a lot of this and so far the only way to get any sort of insight was done by those intercepting OTA updates on a router level.And apart from quickly changing the encryption with the next updates nothing was gained.Is it all coincidence?Of course not.Well known leaks were kept open for years.Kernel updates gave improvements and closed really old leaks but never all known ways.With the retirement of the best rooting experts these holes were suddenly closed.Checks of latest kernel releases showed that there is no known vulenerabilities anymore that can be misused to gain access.And those finding new ones and making them available for us are bascally gone now.Encryptions and packing algorithms changed, same thing for the actual handling of partitions and rights.Anyone with a decent understanding of how the old ways worked will be able to figure it out with some time wasted on it.From there however the outcome is often dark.The tools needed to work with these new files are not always updated anymore.The developer simply moved on and most of the time without publishing his source codes.And the still best way to protect your firmware from tampering is to encrypt it.In the old days it was enough to sign a ZIP file with a release key not available to the public.Custom recoveries allowed us to get around this.This still works to some extent but now we also get additional checks starting from the bootloader.A modified system will be detected and stopped and a stock system will stop i a modified boot is detected.Even using a custom recovery by flashing or through fastboot is preventable now.Right now the only way for most new devices is a total wipe and the installation of an unsecure firmware with everything.As you already guessed this is to prevent now as well.So does all this rooting stuff actually concern you?Of course not!If you never had any need for rooting or no clue what to do differently with a rooted device than you are a happy camper.But your neighbour or friend might think differently.You see, I have two problems when it comes to "stock" devices.a) I have no clue what data they collect from me and what it might be used for.b) I do not like being forced to agree to terms that are endless and of questionable content just to use the damn thing.For crying out loud: In most cases it is now impossible to even set up a new device without working internet and a Google account.....

Topic by Downunder35m 


Power supply problems for my project

Hi everyone. I'm stuck with power supply problems in my project. My project is a drink dispenser (cocktail machine) with water level indicators. I was thinking of putting 4 water pumps connected to relay modules, controlled by Arduino or microcontroller (something like attiny). The microcontroller would receive a command with 2 push buttons (tasters) and depending on the button pressed, it would combine 2 liquids from 2 tanks into one glass. Now, the code isn't a problem. I need to add a liquid level indicator to the circuit (4 indicator circuits for 4 liquid tanks). Now, the pump I was thinking of buying is rated 5V and the current draw is about 150-250 mA. Attiny2313 operates on 2.7V-5.5V. I found the water level indicator circuit also rated 5V ("https://www.electronicshub.org/water-level-alarm-using-555-timer/" but I was thinking about the one without 555 timer). Now, my question is, what is the best way to power all these components. I was thinking about getting a 220V to 5V 2A PSU adapter ("https://www.ebay.com/itm/AC-110V-220V-TO-DC-5V-12V-24V-Switch-Power-Supply-Driver-Adapter-LED-Strip-Light/152134115704?hash=item236be66178:m:mnohYz4NZlT_Dq5l5lWNUMg:rk:1:pf:0"). Will that be enough and will it destroy any of my components. Thanks in advance!

Topic by Kvragu 


Enter a contest twice

Is it allowed to enter 2 different projects in the pcb contest?https://www.instructables.com/contest/pcbcontest/

Topic by FriedZombie   |  last reply