Potentiometer knob collet work??

I have a 6.35mm smooth shaft Potentiometer and looking for a knob to go onto it. I've seen the set/grub screw type, i get how they work but worried about slipping. Also seen the collet type but not to sure how they clench down on the shaft. The shaft isn't threaded, as just a groove running along the top of it. Would it work like a conventional collet from say a dremmel tool?   

Topic by JonathanM221   |  last reply


Need help wiring salvaged electric motor

Hello, I have an electric motor I salvaged from a clothes dryer. I would like to add a three prong plug to it. However, I'm not experienced enough to read a schematic and I can't find any other tutorials that use the same motor. It's from a 2014 Whirlpool Dryer. I need to know where to connect the black, white and green wires. Any help is appreciated.

Topic by ttemple2   |  last reply


Whats is the full form of VKD, VDL, VKR in PVC Valves

Whats is the full form of VKD, VDL, VKR in PVC Valves.

Topic by rajkw   |  last reply


Gs to Speed Converstion

I am looking for the math equation that converts G load to speed using Arduino (https://www.adafruit.com/products/2796)?  I am building a high power rocket data logger/controller. I need to know the speed by using accelerate of the bird. Yes I might be able to use GPS info, but at super sonic speed GPS can not keep track of the speed. The bird is a 2 stage bird. I want to stage when about 40% of the speed has bleed off.  Thanks Rocket Nut

Topic by Rocket Nut   |  last reply


LED Wiring Question

Prologue:  Please be gentle...once I get past V=IR and the "right-hand" rule, I'm lost to electronics.  But I can solder and follow a schematic. I have several (7) LED sets (each set = 10 LEDs with power pack containing 2 AA batteries, switch, and resistor).  Each set of LEDs are all the same color (if that makes a difference). Image attached. Question:  Is there a way to connect all LED sets to operate with a single switch and maintain each set with it's own power supply? On a lighter note, I'm building a project for some pre-schoolers and want to hide all wiring and switches from those "inquiring minds" and "wandering" hands. Thx in advance. Paul D

Topic by PDevline 


Simple wireless remote switch

Hi all, Long time fan off the site. Just wanting to verify this a concept before buying and building. current situation, looking for a wireless switch solution for a X-ray generator: Machine has a 2 stage switch 1st depress is prep 2nd depress fire. switch is wired with standard telephone cable red and black common. yellow prep  green fire I think the product linked(sorry if not allowed) will do the trick? http://www.ebay.co.uk/itm/12V-2-Channel-Wireless-RF-Remote-Control-Controller-Switch-Receiver-Transmitter-/152308878478?hash=item2376510c8e:g:a~wAAOSwZVlXpZ3X It has configuration for momentary connection so function would have to be hold a button then when ready hold b button Any issues with this?

Topic by TerryJ31   |  last reply


Which Boost/buck converter? LTC3780 vs LM2577S LM2596S

Hi, brought two boost buck converters to build a bench power supply from a atx psu.  Brought the LM version first as i have read previously that these are quite efficient, then seen the LTC one, so thought i might as well buy that as well.  Looks like the LTC board will be able to go down to lower voltages and appears to have a greater efficiency, quoted up too 98%, compared with the LM's at around 80%. Thou i understand that with adjustments changes efficncey.  LM2577S LM2596S http://www.ebay.co.uk/itm/281777880409?_trksid=p2057872.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT LTC3780 http://www.ebay.co.uk/itm/332009159315?_trksid=p2057872.m2749.l2649&ssPageName;=STRK%3AMEBIDX%3AIT Which one do you think i should use? Regards

Topic by JonathanM221   |  last reply


Arduino

I am making a micromouse and want integrate the encoders using the fuction interrupt with the Arduino UNO. The encoders are from parallax; Boe-Bot Digital Encoder Kit. Know how programed using instruction of interrup. https://www.parallax.com/sites/default/files/styles/mid-sized-product/public/28107_3.png?itok=1K1pfZbG

Topic by gabon   |  last reply


security system (not responding after combining ultrasonic sensor code and esp8266 code )

The base of this project is https://www.instructables.com/id/SIMPLE-ARDUINO-ULTRASONIC-SENSOR-DOOR-ALARM-/ &http;://randomnerdtutorials.com/door-status-monitor-using-the-esp8266/ I changed according to my uses from above links I tryed by dividing into two parts one for ultrasonic sensor and other for esp8266 they worked fine while separating ultrasonic and buzzer are working in (Tools and wifi module is working in onlt(Tools when i mix ultrasonic and buzzer nothing happening) any idea here is the code #include #include #include #include #define USE_SERIAL Serial #define trigPin 9 #define echoPin 10 #define piezoPin 8 ESP8266WiFiMulti WiFiMulti; int normalDistance; boolean triggered = false; long duration, distance; void setup() {   USE_SERIAL.begin(115200);   pinMode(trigPin, OUTPUT);   pinMode(echoPin, INPUT);   pinMode(piezoPin, OUTPUT);   long duration, distance; while (millis() < 5000) {   digitalWrite(piezoPin, HIGH);       digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance= duration*0.034/2;         normalDistance = distance;       USE_SERIAL.print("Distance: "); USE_SERIAL.println(distance);         digitalWrite(piezoPin, LOW);    for(uint8_t t = 4; t > 0; t--) {         USE_SERIAL.printf("[SETUP] WAIT %d...\n", t);         USE_SERIAL.flush();         delay(1000); } WiFiMulti.addAP("username", "pass"); } } void loop() { digitalWrite(trigPin, LOW); delayMicroseconds(2); digitalWrite(trigPin, HIGH); delayMicroseconds(10); digitalWrite(trigPin, LOW); duration = pulseIn(echoPin, HIGH); distance= duration*0.034/2; USE_SERIAL.print("Distance: "); USE_SERIAL.println(distance); if (distance < normalDistance-5) {       triggered = true;     }     else {         triggered = false;     }     if (triggered) {     tone(piezoPin, 635);     delay(500);     tone(piezoPin, 912);     delay(250);     if((WiFiMulti.run() == WL_CONNECTED)) {         HTTPClient http;         USE_SERIAL.print("[HTTP] begin...\n");                 http.begin("iftt link.........................."); //HTTP         USE_SERIAL.print("[HTTP] GET...\n");         // start connection and send HTTP header         int httpCode = http.GET();         // httpCode will be negative on error         if(httpCode > 0) {             // HTTP header has been send and Server response header has been handled             USE_SERIAL.printf("[HTTP] GET... code: %d\n", httpCode);             // file found at server             if(httpCode == HTTP_CODE_OK) {                 String payload = http.getString();                 USE_SERIAL.println(payload);             }         } else {             USE_SERIAL.printf("[HTTP] GET... failed, error: %s\n", http.errorToString(httpCode).c_str());         }         http.end();     }     } } any idea about whats going on Thanks Hemanth

Topic by hemanth kumar reddy   |  last reply


L298N Information

I have a L298N Dual H-Bridge Motor Driver, which I believe is from SainSmart as it matches the one they are currently selling here exactly. The reason I am not 100% sure is that I picked mine at one of those stores that sells lost mail and packages and I only paid 50 cents for it. I have searched through many different instructables, and other places, but I am not finding the information that I want/need. I think I understand most the this little board except for the In1, IN2, IN3, & IN4. On the one I have these are jumpers. (See link above) My question is exactly what are these for and how do you set them up to use two DC motors (Not stepper motors). Also I have read that if the Vcc supply voltage is between 7Vdc and 35Vdc that the 5Vdc connection can be used as an output but I can't find anything that tells me how to set this up since I assume that if you can do this it can be used to power an Arduino or Raspberry PI ( I have an Uno Rev 3 & R-Pi3). Can anyone either tell about these things or point to a link so I can read about them myself. Thanks to all! MC

Topic by mbcharney   |  last reply


USnooBie

The USnooBie is a microcontroller kit that does not require any sort of AVR programmer or USB-to-serial converters to load and run compiled code. It's hardware design allows the user to develop low cost USB devices with Atmel's AVR ATmega microcontrollers. It can also be used to develop projects which are not USB devices. It is even compatible with Arduino. No AVR programmer is needed and no USB-to-serial converter is needed to bootload. The bootloader uses native USB and works with AVRDUDE. This makes USnooBie the fastest and cheapest way to get started programming AVR microcontrollers AVRDUDE is cross platform, so it works on Windows, Linux, and Macs. Make V-USB based USB devices using AVR microcontrollers, great for making keyboards, mice, joysticks, gamepads, and other neat gadgets. Of course, you can also make non-USB projects as well because USnooBie uses the same microcontroller as Arduino. Compatible with Arduino. Thin design for use with breadboards or plugs straight into a USB port. Operating voltage is selectable between 5V and 3.3V by a jumper. Protection diode and self-resetting fuse protects your computer from over voltage, reverse current, and short circuits. Buy one from Seeed Studio Instructions and Tutorials on the Official Website

Topic by frank26080115   |  last reply


Custom audio jack for Front case of PC, need help!

Hey guys, I have started to do a little project for myself to convert my PC case. While everything was going nice and smooth I decided to look for cool audio jacks for front panel. Now the problem became when I couldnt find anything cool. And so i was wondering is it possible to solder the jacks somehow to be used on a motherboard pins. Was thinking to use something like:  http://www.ebay.co.uk/itm/2-x-3-5mm-Mini-Stereo-Jack-Chassis-Panel-Mount-Headphone-Input-Socket-Connector/361451740585?_trksid=p2385738.c100677.m4598&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D20160908110712%26meid%3D1f134081ba3e461ab61500c43348c0d0%26pid%3D100677%26rk%3D7%26rkt%3D18%26sd%3D322058304419 . Any ideas, instructions are more than welcome! Thanks in advance! Regards, Arnold

Topic by ArnoldasK1 


Exercise bike racing.

Iv recently purchased a mirafit pro exercise bike,it has a cadencse sensor (2 wire connecter)linked to a ok ish computer kph distance calories,i was wondering if theres a way of making it more enjoyable linking the bike to a computer video game or something along those lines,iv had a look on the net for ideas but cannot manage to string components to a game/software without spending a lot of money can you help please. Simon.

Topic by simon mason 


Thermoelectric plates not working?

Hi, I am doing a school project and i need to power 8 LEDs with 10 thermoelectric plates, so i soldered 2 on one led and put them over a candle, the LED didn't light up and i don't know why. Is the voltage too low? If so will i be able to power 8 LEDs with ten of these in parallel?  Thanks for any help in advance!

Topic by CrazyPharaoh.   |  last reply


What to do with an old radio SPEAKER

Hi, I've got a speaker from my butchered old radio. I took its whole part, including wires that it connects, then I told myself why not make my self my personal speaker where I can play it in bluetooth or in drive. But I don't have and materials. What's the missing piece?  I think i am missing this: Bluetooth module Usb Port ON/OFF switch volume module(some kind) yes i need a rechargeable battery some kind of chip board (arduino i think) Am I correct?

Topic by MikoT7   |  last reply


Timed Arduino, Solar Panel, Battery & 12V Pump HELP

Hi all, I'm a struggling to do a project in less than 1 week for a charity and wondering if the www can help. I'm a complete electronics/Arduino beginner so please break any suggestions down, thanks! The challenge: I need a little water pump to run for 3 seconds with a 10 minute pause completely off the grid 24/7 from a battery. I need the battery to be charged using a solar panel and hold enough storage to run 2 days without sunlight. An Arduino is also needed to change the duration and interval of the pump. What I know: The pump requires ~12v @ ~270mA (5W) and 64.8mAH (for 2 days of operation) (pump runs for 18s per hour = 0.05h per hour 0.05h x 270mA = 1.35mAH 1.35 x 48hrs = 64.8mAH) I also need to be able to take the battery on a flight so please recommend a suitable battery for the system (I was thinking maybe the Li-ion 18650? http://www.ebay.co.uk/itm/311727421481?_trksid=p2060353.m2749.l2649&ssPageName;=STRK:MEBIDX:IT). Pump: http://www.ebay.co.uk/itm/222223864810?_trksid=p2060353.m2749.l2649&ssPageName;=STRK:MEBIDX:IT What is the simplest way to wire & code everything up? (Please also recommend any required components) Any help is much appreciated!

Topic by nikian.aghababaie   |  last reply


diy welding mahine cable size?

Hi guys i wanna make a welder. i checked https://www.instructables.com/id/Making-an-ARC-Welder-Part-1-of-2/ there the king uses 8 awg copper cables for the winding of the transformers.  here (namibia) they seem to have only 6 or 10 sqare mm cables. can i use 1 of those?

Topic by kefflon   |  last reply


Is my HDD verging on failure?

I decided to check my HDD's S.M.A.R.T status, and I was a bit alarmed to see my reallocated sector count at 32 and my pending reallocation count at 24. This hard drive has been running for about 2 years and a half, and I haven't had any noticeable trouble with it. But, what should I do (besides backing my stuff up)?

Topic by Dashing Rainbow Dash   |  last reply


Rc car out of ps3 controller+quadcopter???

Hi im just wondering if it's possible to build a working rc car using parts from ps3 controler and quadcopter such as ESC ,battery ,  2 motors in controller to power 2 wheels... ( This is just to see if i can find any use of those two things that i dont use , not trying to create a really good rc car , just checking if it is possible) The two motors would both have to spin at different speeds to make the rc car turn.

Topic by Z1G0 


adafruit 8x8mini LED and 3cm OLED display

Hello all, I am building a Arduino WALL_E robot for my son. I am using 2 x 8x8 mini LED arrays using TWI and I would like to add on a small OLED (0.96inch) display. Both of these require pins  a5 and a4. The 8x8 led arrays using the adafruit_ledbackpack library and the oled using oled_12c Library. I dont know how I can get the OLED onto another set of pins. can any one help? cheers Shaun

Topic by ShaunF3 


pi coders wanted

Looking for a few coders to help make a better 3d system based on the pi and arduino. apps available will incclude: 3d printing tool usage CNC 3d scanning and more to come I have next to NO experience in coding but have designed and tested 2 machines that I need programmers for. these will be opensource at the end and also sellable. I am hoping to make a store similiar to playstore or app store so that advanced programmers can also make a small amount for exceptional products. the idea is huge but could be beneficial to several thousand people including users of this forum in helping them with techniques and skills they have not yet mastered. the project is HUGE and the mechanical side is largely done with the exception of a few parts that are added extra. other inclusions will be safety features and high perfomance. for those that are interested in this AND have coding experience I look forward to your replies on this topic

Topic by plucas1 


Wireless button to talk to computer

Hello, I'm running some sessions with a multi-abled theatre group of kids and we want to create a piece of interactive dance. Each kids will carry a couple of buttons and when they press them they send a signal wirelessly to a computer nearby which is running the dance program connected to a projector so the kids can see what they are doing. So pressing their button could change the colour of the kids projection from red to blue.  I think I need to use a microcontroller inside a button but am not sure which one - cheap and small - bluetooth or wifi? How do I get the button press program onto the microcontroller? Finally how does the computer hear the signal? The dance program is written in Processing.  Is there a project that is similar? I've searched for lots of things but can't find exactly what I need. Thanks The kids will enjoy this Tim

Topic by GeneticM   |  last reply


AUTO HEADLIGHT LEVELING stepper motor based on arduino

Hello everyone, first sorry if I make some erreur in my writing post, I m a French people, so I would like know if it's possible to make a project arduino based with a accelerometer to use like an auto leveling adjustment for the road beam, actually on my car I was a standard halogen headlight with dc motor and a wire to control I change the headlight by a full xenon and now for the gestion of the leveling I need a third part to work in a autonome mode, I had searched for a while a module to control the  stepper motor based on the car inclination and I had found nothing who'll be use with an accelerometer to adapt to car acceleration or deceleration,  I guess I need an accelerometer, and a stepper motor controler 12v I would like know how hardest is to setting up? Thank you

Topic by gagaetan10 


Free NASA Software!

From the NASA press release: NASA has released its 2017-2018 software catalog, which offers an extensive portfolio of software products for a wide variety of technical applications, all free of charge to the public, without any royalty or copyright fees. Available in both hard copy and online, this third edition of the publication has contributions from all the agency’s centers on data processing/storage, business systems, operations, propulsion and aeronautics. It includes many of the tools NASA uses to explore space and broaden our understanding of the universe. A number of software packages are being presented for release for the first time. Each catalog entry is accompanied with a plain language description of what it does. “The software catalog is our way of supporting the innovation economy by granting access to tools used by today’s top aerospace professionals to entrepreneurs, small businesses, academia and industry,” said Steve Jurczyk, associate administrator for NASA’s Space Technology Mission Directorate (STMD) in Washington. “Access to these software codes has the potential to generate tangible benefits that create American jobs, earn revenue and save lives.” NASA published the first edition of its software catalog in April 2014, becoming the first comprehensive listing of publicly available software to be compiled by a federal government agency -- the largest creator of custom code. Since then, NASA has shared thousands of its software programs with students, industry, individuals and other government agencies. “Software has been a critical component of each of NASA’s mission successes and scientific discoveries. In fact, more than 30 percent of all reported NASA innovations are software,” said Dan Lockney, NASA’s Technology Transfer program executive. “We’re pleased to transfer these tools to other sectors and excited at the prospect of seeing them implemented in new and creative ways.” The searchable catalogue is here: https://software.nasa.gov Wouldn't it be cool to use NASA code in your next project? https://www.youtube.com/watch?v=JIpyc8AfMZY

Topic by Kiteman   |  last reply


Can I power a raspberry zero + arduino with a powerbank?

Hello everyone, I want to make some kind of driving computer, but I don't know how to fix the power. I have a 16000mah powerbank that has a 1A and a 2A power output with 5v. And I want to power the following: Raspberry Pi zero Internet dongle Arduino Arduino Motor Shield 4 motors(DC 3-6v each) 2 servos 1 webcam (optional) I really hope someone can tell me if this is possible. The reason I don't want to use normal battery's is because I want a solution that is easy to recharge.

Topic by Thijsd4   |  last reply


making a bluetooth servo circuit to run an aerosol can at distance

hello all, I am a novice to the servo and arduino world. I am wanting to build a system that can spray an aerosol can at distance. around 100 yards.  Is there a way I can accomplish this? what parts would I need to do so? thanks for your time and help!

Topic by LucasF107   |  last reply


Erase a dvd+R using software

Ok so we all know its possible to write a dvd+r up to the limit. (one time only of course) So if it can write data once, that why cant we have it ignore the data or headers and just write all 1's or just random garbage to the disk to destory it? It actually sounds cooler than breaking it... If there is software than please provide a link (if its free/open source)

Topic by BeefyHaze   |  last reply


Laptop's fingerprint reader, is it possible to reuse it on desktop?

The dead laptop is a HP Pavillion dv3 4010sl, the sensor is a Validity VFS301 (cdk1071_r04_hf) as written on the sensor itself. if i remember correctly it was shown as a USB peripheral. maybe is simple and it need just some resoldering to a USB cable, the problem is that the flat cable connecting it to the motherboard has 6 pins/lines and my knowledge in electronics is quite limited... I've found online what seems like a motherboard schematics (pg.48) and the vendor's sensor's manual. Does Anyone knows if is possible, If yes how?

Topic by CladZo91   |  last reply


<5mm distance sensing, <100micron accuracy, GUI, RasPi or Arduino?

Hi there, I am trying to keep my hardware/ coding skills alive and spruce up my bicycle wheel truing stand. I need to figure out the required hardware + software for the following: I want to build a non-contact distance measurement sensor system and get the output "into" my computer for display in a graphical user interface. I know I could omit the latter step with going directly onto a mini-LCD screen, but trying to use this a learn-another-programming-language learning experience (I've coded Matlab galore, pondering Python for this project). General system components: Sensor - [something - RasPi or Arduino I guess] - laptop (running debian) - GUI displaying continuous sensor reading Sensor: I've web-searched the hell out of this, but not finding anything quite answering my questions. I want to continuously measure the distance from the sensor to a bicycle wheel rim braking surface. Material is aluminium, shiny, though not smooth. Biggest problem with the web-search is being swamped by proximity sensor results (on/off) rather than a distance proportional output signal and much lower resolution projects. I rule out IR or optical sensing, now stuck between ultrasonic and inductive sensing, though tending to the latter for a faster response/adjustment to change time. Sensor criteria (other than reasonable $$): - total sensing range: ca.5mm - sensing accuracy 10 to 100micron/ 0.01 to 0.1mm - don't ask if that's needed, a bit of overkill, I know, but a bit of OCD doesn't do any harm, eh? - fast-ish sampling rate (so that when I turn the wheel, the number on the screen updates nice and fast, guess >25Hz is sufficient). [Something - RasPi or Arduino]: I know that I could omit the laptop GUI part (mini-LCD, LED array, etc), but keen to learn/ practice a little Python with this project, so I guess I am tending to the RasPi, but I am open minded. All I want is the analogue sensor out to end up as a digital reading "inside" my computer to be passed to my GUI as a reading. Essentially a mini A2D converter. Not fussed whether the output is in actual distance units or in arbitrary units/ current units (I guess the sensors put out a proportional current signal?). GUI: Depending on the above, how do I best get the signal "into" a Python program? A moderate fast sample rate >25Hz should suffice.  Any help with this would be greatly appreciated! LaserCycle

Topic by lasercycle   |  last reply


Help needed with designing/building lights-and-sound gadget for magic trick

Hi guys, I'm hoping someone can help direct a complete newbie. I'm a magician trying to build a gadget that looks like a steampunky-science-device. I'm working on a routine like this one: https://www.youtube.com/watch?v=GTikFSOBIA8 If you go to the 09:00 mark you'll see it in action. I bought the instructional DVD from the man in the video which supposedly includes instructions on making the gadget, but although he explains the flash-paper-ignition part clearly he doesn't even touch on how to make the lights and sound. I'm fine with woodworking, soldering etc. but I have no clue what pieces I need to buy to make flashing lights, squeally squawky adjustable sounds etc. If anyone can tell me what parts I need and how to string them together, or where to go to find suitable instructions, I'd be very grateful.

Topic by MalcolmR15   |  last reply


need help for nrf24l01+

Well i am using rf24 module for a project since i am new to it i am having some difficulties to send the data. Actually i am doing a remote consisting of a geeetech voice module + nrf24 + arduino nano. It must communicate with a hub which comprises of arduino uno + rf24 + relays. I have tested the voice module and the data is read as serial command. see the code for a simple example without rf24 below. For my project i need to make the transmitter read the serial command of the voice module and send it to the receiver side. In the receiver side it will activate relay with a switch case section. I would appreciate if anyone could help me out and suggest me how to send the command of the geeetech voice module via rf24. //code for simple test between voice module and nano int led1 = 2; int led2 = 3; byte com = 0; void setup() { Serial.begin(9600); pinMode(led1, OUTPUT); pinMode(led2, OUTPUT); delay(2000); Serial.write(0xAA); Serial.write(0x37); delay(1000); Serial.write(0xAA); Serial.write(0x21); } void loop() { while(Serial.available()) { com = Serial.read(); switch(com) { case 0x11: digitalWrite (led1, HIGH); //turn red on break; case 0x12: digitalWrite (led2, HIGH); // turn yellow on break; case 0x13: digitalWrite (led1, LOW); // turn red off break; case 0x14: digitalWrite (led2, LOW); // turn yellow off break; case 0x15: digitalWrite (led1, LOW); digitalWrite (led2, LOW); // turn both off break; } } }

Topic by keshavcanaye 


Notifications from Android to Arduino via Bluetooth

I would like my phone to relay my notifications from the notification tray to an arduino. I had done alot of snooping around, and I have not found anything regarding doing that. Closest thing I had come to was sending notifications from the arduino itself, to the phone. But I want it the other way around. The idea is that it would display it to one of those 16x2 LCD displays, scrolling through whatever the notification says. I have yet to get the LCD, but in the meantime, I'd like to see about getting it to come through to the serial monitor. Does anyone know how to get android to do something like that?

Topic by Dashing Rainbow Dash   |  last reply


Increase voltage in my 12v Ryobi drill?

Hi Guys! I have a Ryobi 12 v power drill that is really tired. I don't wanna buy a new battery because after a few month it got so weak. I read the inspiring post Hot Rodding a Power Drill Battery by archer6817 and would love to try it. But I have a question.  Can I increase the voltage if I put in new cells,  like 14 or 18 volt?

Topic by kefflon   |  last reply


Nintendo Wii cd drive to SATA conversion

Hello everyone, I was wondering if someone could help me out with a problem I'm having, I'm trying to use a Nintendo Wii cd drive as an external cd drive(similar to the apple superdrive) and I was wondering if anyone has any idea how to convert it to either USB or SATA, I've spent hours online looking for solutions but all I could find was an Arduino forum with some pinouts, but I don't know what they mean. If anyone could help me out that would be greatly appreciated. Thanks, Daniel http://forum.arduino.cc/index.php?topic=158745.0

Topic by daniel12354   |  last reply


load a 12V battery by the cigarete lighter

Hello guys, I want to make a publicity trailer with led's that will stand at party's (and on the side of the road in the week). This trailer will stand alone and will be powered by a 12V car battery. I would like to charge that battery while moving it with my car by a long cable to the 12V socket in the car. Should I place a resistor to limit the current or is this not necessary? The trailer is for my youth movement. (sorry for my bad english) Grts, Dieter Belgium

Topic by DieterD4   |  last reply


USB to Arduino USB Wirelessly?

I am currently working on a robot that has a deadline in about a week, and so far, there is only one problem we haven't solved yet: Communicating with it without a wired connection. Currently, we have a program on a desktop send the Arduino the gcode via USB cable. What we would like to do, is send that information without actually having it connected with a wire. Originally, we were going to have a Bluetooth module connected to the arduino directly, and have the desktop program communicate with it. Unfortunately, due to time constraints, we haven't managed to get it working, and would like to move onto plan B: communicate through the USB port, and essentially leave the Arduino untouched.  I did a little googling, and I wasn't able to figure out very much on Bluetooth dongle -> Bluetooth -> USB that was actually positive and helpful. Currently, we have a few HC06 bluetooth modules lying around, as well as a few spare Arduinos. I was thinking of connecting one of the modules to another arduino, connect that arduino to the robot's arduino, and communicate with the first arduino via the bluetooth. Essentially, the first arduino would be an interface for the second one. Would this work? How would I go about doing it? In short: What would the best method to communicate between a PC and the USB port of an Arduino wirelessly be? Anything helpful is always appreciated, thanks!

Topic by RocketPenguin   |  last reply


Sound location & motion tracking robot head

Hi guys I hope this is ok to ask about as I have followed Instructables for ages but not used the forum part before. I have a bit of experience of arduino projects and doing basic sketches for them but nothing as ambitious as this so am seeking a bit of advice if possible. I'd like to be able to have a droid/robot's head that can rotate to focus on the direction of a sound, then if it sees a person once looking in the direction it heard the sound, to then roughly track them (move its head) with a camera. I'm fine with motorisation and that side of things, but I'm not sure if this sort of fairly elaborate setup would be possible with an arduino or would need something more powerful like a rasp pi? I'd imagine that I would need an array of several mics as inputs around the bot in a 'circle', and code that can estimate the direction by means of the signal strength from the mics when it hears a noise.  I think this might be something I can manage to do, but then it'd need a suitable camera and a means of tracking and I've no idea how the tracking side of things would work with that. I'd be grateful for any pointers to get me going thanks.  It's not something I could do without help but hopefully doing it bit by bit and with some advice I'd be able to do this, as I would really love to make it work! Many thanks! Jim

Topic by Mr Joshua   |  last reply


Arduino automatic barrier

Hi , I need a little help on programming a arduino to complete a college project , I've to get a barrier to raise 90 degrees to allow a toy car to pass automatically, i would like to use a the motion sensor and a servo to do this but I dont know how to get one to trigger the other. I would like to know where to look up to get a idea of how to do this . This is my 1st post so sorry if this is in the wrong forum Thank you

Topic by DavidO242   |  last reply


Microphone to speaker amplifiers

I want to make a microphone to 8 ohm speaker amplifier. I have tried using the lm386 op amp, however, the results were poor. What other IC could I use for this project? PD: It would also be of great help if any of you could send me a schematic along with the new IC since I am relatively new to electronics and still learning.

Topic by MrB12   |  last reply


Anybody feel like making an Instructables app?

So you guys may know that Instructables no longer supports their apps for either phone platform. This is a pain as many of us like using our phones for the things they look at on the site. Is anyone interested in putting together an Instructables app?

Topic by jchoneandonly   |  last reply


Electroactive Polymers

I am planning on making some elctroactive polymers. Any tips or advice?

Topic by degrooty   |  last reply


Batch Beeps

Some kids at my school have created some sort of command prompt to where it plays beeps at different pitches to create almost what one would call music. I was quite amazed by this and was wondering if anyone else knew how to make these sounds? All I know is that command prompt is involved. Thanks :)

Topic by qwewqazaq   |  last reply


PROGRAMMING PIC MCU TO RETURN TO PREVIOUS ADDRESS

 HI GUYS, I NEED HELP HERE WITH CODE TO FLASH LEDS USING SWITCH STATEMENT, I`M NEW IN PROGRAMMING AND LEARNING THIS ON MY OWN, I KNOW HOW TO FLASH LEDS AND SET DIFFERENT FLASH PATTERNS, MY PROBLEM IS WHEN I SWITCH OFF MY LEDS/POWER  LETS SAY ON SWITCH CASE 5 AND SWITCH POWER BACK ON, MY PROGRAM GOES BACK TO SWITCH CASE 1, HOW DO I PROGRAM IT TO RETURN TO SWITCH CASE 5 WHEN I SWITCH POWER BACK ON? I MEAN I WANT MY CODE TO START WHERE I LEFT IT BECAUSE I DON`T WANT THE USE TO SET PATTERN EVERYTIME HE/SHE SWITCH ON THE LEDS. I`M USING PIC16F1782, PICKIT 3, MPLAB X IDE, MCC,XC8. THANK YOU IN ADVANCE 

Topic by AndrewN102   |  last reply


Help picking DC on/off switches

I'm in the process of trying to build a battery powered trailer mounted speaker system and i've got nearly all the parts now except for power switches. I didn't think i'd have a problem with choosing some but after searching around the vast majority of switches seem to be rated for AC or 12 or 24VDC and the absolute highest DC rating i've found so far is 28V, the problem is that the highest voltage i'm using is a little under 36VDC so where do i find appropriate switches? I've been getting helpful advice about the speaker project from someone on a forum called SpeakerPlans but they seem to think that i'd be fine using an on/off switch rated at 5A 12VDC despite the higher voltage requirements of my amplifier, i'm not very electronics literate but this doesn't make sense to me and i'm a bit worried about pushing too high a voltage through the switch and perhaps causing a fire or something. I would prefer a rotary switch if possible as i used one on my old 12V speaker and i found that it's a lot less likely to catch on clothes and bodies and break or accidentally turn on while the speaker is being manhandled/transported about. I have 2 circuits in my speaker setup, one is the 36V circuit powering the amplifier/speaker and the other is a 12V circuit powering a small mixer to boost the gain and tweak the sound, assuming i can find a switch capable of handling the 36V is it possible to have one switch that could be wired up to turn on both circuits at the same time?

Topic by ambientvoid   |  last reply


Acoustic Levitation?

I want to know if anyone knows a way to do this at home. Acoustic levitation is a way to levitate objects in space using sound waves. That site gave a very thorough explanation of how it works, but not how to do it. If someone knows how, I'd love to see an instructable.

Topic by ultrauber   |  last reply


GoPro Scuba Cylinder Mount

Hi there, I'm new here. I've recently found an entry-level 3D online modelling software, Tinkercad and have been Tinkering ever since. I'm into scuba diving and I've long wanted to design a GoPro mount for the cylinder to give a 3rd person view of me while I'm swimming about enjoying life underwater. (Think a less-sexy Lara Croft!) I wanted to run it past you guys to see what you think. I've attached 2 screenshots, because as you can see, the mount I've designed is collapsible, to save space in my GoPro bag. I've done the maths (Pythag) so each side is perfectly lengthed to create a right-angled triangle, with the hypotaneuse (long edge) is facing down my body, towards my feet, so that the camera view won't be obstructed. I've used a Pythag triple, so the arms measure 3", 4", 5". This was done for 2 reasons: a) It was easier to desine using these measurements and b) I don't want it sticking too far up from my cylinder so that it doesn't catch on wildlife/coral/divers. As this is my first GoPro mount that I've designed, I've had to go on deimensions I've found online for the actual hinges. I've settled on approx 3mm for each prong as well as the gap in between. I have actually shaved off .25mm from the middle prong of the 3-pronged-hinge, and left the 2-pronged-hinge at 3mm for the gap and prongs. I'm going to get the pieces 3D-printed by a local service I've found on 3DHubs.com, either in ABS plastic or in resin, though I'll probably go for ABS as it seems to be a bit more hard-wearing, even if it's not so detailed. In terms of mounting it to the tank, I will use 2 headstraps, with the over-the-top strap removed from each one and glue the plastic bits of each of them together, at the correct length of course. I would join them using a seperate piece of plastic and either a hot glue gun, superglue or even some sort of epoxy, whatever lasts longest in prolonged exposure to seawater. I would probably place it nearer the top of the tank, near to where the strap of the BCD jacket goes round it. Does anybody have any advice for me in terms of the design from a functional point of view as well as from whether they think it would actually get a good shot on the camera please? I look forward to your feedback, good or bad!

Topic by JackIsted   |  last reply


Arduino code sensor and moving wheel with encoder help with code

I'm still new at this but I been trying to figure this out for awhile now and can't seem to get it to work how I want it to. If  anyone can help or give advice on how I can go about doing this would be great. Thanks #include       const int BUTTON = A5;              // push button for starting       const int RIGHT_SERVO = 10;       const int LEFT_SERVO = 11;       Servo leftServo;       Servo rightServo;       int valButton;       int turnOnOff=0;             // the val of the pull up button is set to zero to start with             volatile int Lindex = 0;             void setup()       {         attachInterrupt(0,ltEncoderInterrupt,RISING);         Serial.begin(9600);         leftServo.attach(LEFT_SERVO);         rightServo.attach(RIGHT_SERVO);         leftServo.write(1500);         rightServo.write(1500);       }       void loop()       { Serial.println(turnOnOff);         turnOnOff=readButton();      // calls the function readButton to see if the button has been pressed(1)         int sensorValue = analogRead(A0);         if(turnOnOff==1)         {           if (sensorValue <300) //This robot moves on a white background           {           delay(500);                  leftServo.write(1700);           rightServo.write(1300);                              }           else if (sensorValue >300)           {                     // It stop when it detect a black electrical tape.           leftServo.write(1500);           rightServo.write(1500);            Lindex = 0;           delay(500);             }                                // can't seem to get it to work it keep moving backward           {                     }           leftServo.write(1300);           rightServo.write(1700);                     while (Lindex < 50) // this is how many tick i want it to move back with the encoder           {                     }           turnOnOff = 0;           Lindex = 0;         }                 else         {           leftServo.write(1500);           rightServo.write(1500);                  }        }             /************* Subroutine for reading the button switch********************/       int readButton()       {         unsigned long contactTime;               //local variable; contactTime declared         valButton=analogRead(BUTTON);            // Read the pushbutton on an analog pin         if(valButton>512)                        // Since 5V will produce a value of 1023, < 512 means button not pushed          return turnOnOff;                       // return the value of turnOnOff without changing it         contactTime=millis();                    // set contactTime = to the millis() clock value         while(valButton<=512)         {                   // while the pushbutton is pushed           valButton=analogRead(BUTTON);           // read the button value again and keep reading until valButton is less than 512         }         if(millis()-contactTime<20)               // If the button is held for less than 20 ms          return turnOnOff;                       // return the turnOnOff value unchanged          return(1-turnOnOff);                      // if the button is held longer than 20 ms then change the turnOnOff                                                  // to the opposite value to what it was       }       /////////////////////////////////////////////////////////////////////////////             /******************ISR for wheel count**************************************/       void ltEncoderInterrupt()       {                Lindex++;       }       ///////////////////////////////////////////////////////////////////////////////

Topic by al2tistic   |  last reply


Detecting digital screens (PC and Mobile)

Hi everyone, I have a project which is based on detecting the screen of PC or Mobile. Are there any common properties in digital screens? what is the best sensor or the best way to detect digital screens? I'm doing image processing, but I want to add quality by using sensors.  Thanks in advance

Topic by RashadS5   |  last reply


AtTiny85 port analog / digital setup order bug

/*How to configure port setup in correct order AtTiny? Bug in combiler or  what is wrong here? Circuitry here has two LEDs and one analog input.  LEDs are ON or OFF depending voltage of potentiometer. Simple code below makes digital output PB1 high impedance, so LED current is too low because voltage drops. If port configuration setup is made in other order port output works fine. */ /*                     ___     D5 PB5  1|o      |8  Vcc     D3 PB3  2|        |7  PB2 A1   Voltage measurement, potentiometer     D4 PB4  3|        |6  PB1 D1   --|>--|          GND  4| ___|5  PB0 D0   --|>--| */ byte led0 = PB0; byte led1 = PB1; byte potentiometer = A1; int voltage; /* It is important in which order pin configuration has been set. Wrong order causes PB1 to high impedance, low current, output. This must be combiler bug, I think. If port BP1 setup has been made using straight to register there is no problem in order. Any other analog input port and digital port combination works correctly. */ void setup() {   pinMode(led0, OUTPUT);   pinMode(led1, OUTPUT);  // Doesn't work if this is before pinMode(potentiometer, INPUT);   //DDRB &= ~(1 << DDB2); // Alternative working setup for led1 as output   pinMode(potentiometer, INPUT);    //pinMode(led1, OUTPUT);  // Works if this led1 setup is after pinMode(potentiometer, INPUT); } void analog_input() {   voltage = analogRead(potentiometer);   if (voltage < 500) {     digitalWrite(led0, HIGH);     digitalWrite(led1, LOW);   }   else   {     digitalWrite(led0, LOW);     digitalWrite(led1, HIGH);   } } void loop() {   analog_input(); }

Topic by PaavoM   |  last reply


High current variable voltage from an atx psu

What would be the most simplistic way to draw up to 10a on an atx PSU using variable voltage controlled by a potentiometer? I've looked at a few diagrams using the LM317 but it is limited to 1.5a. The only other VVR I can find is the LM350 but is still limited to 3a. Any ideas? I was thinking of stacking an arrey of LM350s in parallel but this doesn't seem like a viable answer.

Topic by andrewlapham2010   |  last reply