arduino.stackexchange.com is a stack dedicated to Arduino

learn more… | top users | synonyms (4)

0
votes
1answer
25 views

Conductive magnet to read resistor value?

I want to know if I can hook-up a resistor to one part of a Magnet Snap (carried by SparkFun), then another magnet snap to analog-pin on Arduino and still be able to read resistance value? Is this ...
1
vote
0answers
12 views

H-Bridge Power Supply Erratic Behavior

Description: I have built a copper plating tank to plate circuit boards and am using a technique called Reverse Pulse Current plating to help aide in the copper plating process. What that involves is ...
1
vote
2answers
69 views

Arduino and resistors

So , hopefully this is my last question on this system it's about the connections: about the transistor, i want to use it like a switch, so i wanted to know how to determine the value of the ...
1
vote
0answers
36 views

How can I make pinMode calls faster? [migrated]

I'm trying to use 3 pins as capacitive pins along side the Mozzi. I had several attempts and so far the closest I had was using code from the ADCTouch library straight into the main code, but with ...
0
votes
0answers
66 views

Magnetic Levitation

I am new to electronics, and I want to do a project where I make a device that levitates an object with the use of an electromagnet, for learning purposes. Something like this is what I had in mind: ...
-5
votes
0answers
22 views

Does anyone know US based seller of HX 711 (24 bit ADC)? [on hold]

I need the HX 711 (24 bit ADC) board for building a weight scale. I am using a load cell (85 pound maximum, 5 grams divisions). All the seller of the HX 711 are based abroad mostly China. Shipping the ...
0
votes
2answers
47 views

Voltage regulator capacitor size

I want to use a LF33 voltage regulator to power a nRF24L01 module from a Arduino Pro Mini. I plan to power the Pro Mini with a 9V battery, then use it's 5V internal regulator to power the LF33 which ...
-2
votes
1answer
43 views

Controlling hi&low voltage of a square wave

I have an arduino that make a square wave between 0-3[V]. Now I need to control this wave with this requirements: Low voltage -5< Lo<5 [V]. High voltage[MAX] - 24[V] & bigger then Low ...
0
votes
0answers
5 views

how to remove Adafruit Pro Trinket bootloader flashing startup sequence [migrated]

From what I understand, the Pro Trinket has "Optiboot" which allows it to detect which boot loader you are trying to use, one for USB and one for FTDI. When it's in this "bootloader state" the red LED ...
0
votes
0answers
60 views

Will this circuit work as a AC-DC-AC rectifier-inverter?

I'm pretty sure I'm missing one or more things from this circuit and can't figure out what (new to this)! The end goal is that an alternating current will come in, run through the rectifier, then ...
0
votes
1answer
76 views

Method to cycle voltage?

In order to use a sensor (MQ-7: https://www.sparkfun.com/datasheets/Sensors/Biometric/MQ-7.pdf) i need to cycle between 5V and 1.4V. Any ideas on how to do this? Thank you!
0
votes
0answers
20 views

arduino brushless motor angular speed

I am using brushless DC motors for my project. I am controlling the motors via arduino through ESCs. I wanted to retrieve the rad/s speed of each motor. I use the arduino's Servo.h library to send ...
0
votes
0answers
15 views

How do I replace a burnt atmega328 with a new atmega328(bootloaded) in arduino? [migrated]

I have an arduino UNO with atmega 328 whose microcontroller got burnt. I bought a new atmega328. I have another working arduino with atmega8. I followed the instructions in ...
0
votes
1answer
38 views

Arduino water solar heater pump control

I am still a beginner, and I wanted to do this project which will be fairly easy if I follow the code and the pic, but there is something I don't understand about the relay connection: Why is there ...
-2
votes
0answers
64 views

How can I speed up reading [on hold]

I am working on a project using an Arduino as a web server. Code: ...
1
vote
1answer
91 views

What signals can be probed with an oscilloscope on an Arduino board?

I got my hands on 35 MHz analog oscilloscope. I'm trying to learn how to use it. Is there something that can be seen with a scope like this on an Ardiuno board? Clock signal maybe? The board I'm ...
0
votes
0answers
25 views

Digital to Analog - Bluetooth from device screen to output old-fashioned Typewriter

I'm working on a hobby project converting an old-fashioned typewriter into an instantaneous printer(!) - basically, by allowing for a digital/virtual keyboard to be able to output to the typewriter ...
0
votes
2answers
38 views

Led Strip Heating Up

I have an LED strip with 7.2 Wattage/m and the strip is 3 meters long. The led strip has R,G,B,+12v inputs and I have connected a 12V DC 1000mA power supply to the +12v and attached transistors to ...
0
votes
0answers
8 views

Arduino Uno R3 not recognized by computer, TX and RX not blinking, neither are lit. Is it dead? [migrated]

I was trying to make my arduino uno r3 to work on my Linux machine (including the IDE), but it wouldn't. At first I thought it was a software problem. Added myself to different groups and did ...
0
votes
0answers
21 views

Connecting relay to arduino … ANOTHER ISSUE? [on hold]

I know this matter has been discussed like thousand times, but my case here is a bit different. here it is ... i am commanding my arduino while it is running by a VB.NET application i am ...
0
votes
0answers
58 views

Controlling the luminosity (flickering) of 2 sets of 12V (in-parallel) lamps connected to external power source, via a PWM pin

I have been playing the last few days with the Arduino mic, and must say it does open a fascinating world. One very basic project I have been doing, with the help of various online tutorials, is to ...
0
votes
0answers
43 views

Turn Nano with CH340G(16 pin) chip into a USB to Serial converter (TX not working)

I am trying to convert a CH340G Bases Arduino Nano into a serial converter with 50% luck. It is able to receive data on the serial side but the USB to to serial bit is not sending data out. (Validated ...
0
votes
0answers
12 views

How are Arduino's OSH if Atmel AVR is proprietary? [migrated]

I keep reading how Arduinos are "open source", but my understanding of OSH is that all its components must be open source. Arduino uses an Atmel AVR CPU - but Googling this shows the Atmel is ...
0
votes
0answers
9 views

Replacing the Voltage regulator of a fried arduino [migrated]

I accidentally fried my Arduino. I found this Instructable. The symptoms are the same. The board not powering on connecting USB source and the over current protector was heating up. So i removed the ...
0
votes
0answers
5 views

Is this Bluetooth module cool for Arduino? [migrated]

I am making a basic project that will have 4 or 5 arduino nodes. Each arduino will have a bluetooth module attached. The thing I want is, I want to be able for each one of these arduinos to know the ...
0
votes
0answers
37 views

how to “implement” an arduiono prototype? [migrated]

I am starting with Arduinos, coming from the world of Linux (with the RPi as a bridge) and after having tested some setups I now wonder where to go next in implementation. What I am trying to ...
0
votes
1answer
57 views

Arduino ECG sputtering out totally random values

Hello StackExchange community, I have encountered a problem in my ECG/EKG design. I am trying to create the ECG using Arduino as a microcontroller to send/retrieve heart rate measurements via ...
0
votes
0answers
4 views

Arduino cannot communicate with PC after running servo [migrated]

I was messing around with my arduino uno r3 and servo today. The book I got said to run the servo through the arduino. Everything was fine. I started changing the code, and then things started to get ...
0
votes
0answers
34 views

How do we use the camera from Android phone in embedded project. [closed]

I have couple of old Android phones water damaged motherboard which kind of power up but fail to stay longer than 5mins. The GPS, Camera on them works flawless. I am thinking of removing the camera ...
-1
votes
3answers
273 views

Is it possible to exchange information between arduino and android phones easily using nrf24l01? [duplicate]

I need to send information from arduino to an android phone, having some app actively listening for radio communication from arduino. Using nrf24l01 is that possible? The best scenario would be ...
0
votes
2answers
56 views

uController SPI Over optoisolator

I would like to interface Arduino over SPI but need a way to decouple the system with an optoisolator. Any pointers in which optoisolator to get? Everything works on 5V. I've tried to connect with ...
0
votes
0answers
9 views

Program/Read 93LC46B with an Arduino with bit-banging [migrated]

I'm Tom. I'm pretty new to electronics and programming but I've been getting better. So, recently I bought a 93lC46B EEPROM from Element 14 (It was $0.28! Why not!). I've been doing some research and ...
1
vote
2answers
84 views

Arduino + MCP41010

I would like to control two 48V DC motors (500W) from electric scooter with my Arduino. I've bought two PWM controllers from eBay and they work excellent. Issue is that controllers have pot on them ...
0
votes
1answer
51 views

Can I use arduino to feed this circuit instead of an external power source?

I am following this tutorial to connect the output from my guitar with arduino. I'm wondering: is it possible not to use the batteries, and to feed the circuit with the 5V output pin provided by ...
0
votes
0answers
22 views

Turn Arduino into a Bootstrap Loader for MSP430 programming [closed]

How can I turn my arduino into a USB Bootstrap loader for programming the MSP430g2xxx series chips?
0
votes
0answers
17 views

Arduino Serial Hex Values [migrated]

Apologies if I have missed a relevant post somewhere, but have search for days to try figure this out... I have written some C# code to send a Byte Array over Serial from my PC to an Arduino Nano ...
0
votes
2answers
46 views

using the Arduino internal reference 1.1v

So i want to measure a resistor of around 20 ohm in a voltage divider with an Arduino UNO R3. Is there any way on an arduino to use 1.1v instead of 5v? I want to do this to decrease the current, ...
0
votes
0answers
22 views

Driving conveyor belts using arduino unos [migrated]

We are planning to drive conveyor belts with arduino unos using stepper motors. We are planning to use easy drivers, so that we control atleast 3motors with one uno. Currently we are still at an ...
0
votes
0answers
21 views

Why doesn't this motor turn? [migrated]

When I upload the code, the DC motor makes a humming noise, but doesn't turn. ...
0
votes
0answers
34 views

Gizduino(Arduino clone) Vin pin Not working

I have a gizduino(arduino clone) used on my project. I use an adaptor that is rated 9V 2A as my source going directly to the Vin pin and GND. I have tested my circuit on the few last weeks without ...
0
votes
1answer
35 views

PIC12F675 Programmer using arduino (port from 12bit programmer)

I bought some pic12f675 and i am trying to program it using an arduino (for testing purposes, I was trying to write a simple blinking led code, I tried both my code hex compiled and another that I got ...
2
votes
0answers
32 views

Increasing RF24 range using an antenna

First time poster here on electronics, so please excuse any big mistakes. I'm working on a project that uses the NRF24L01+ chip for radio communication between an arduino uno and a raspberry pi. It ...
0
votes
0answers
27 views

Creating rectangular components in MultiSim? [closed]

I'm looking to create a rectangular box to signify a component, akin to this in Multisim. The rectangle dimension and pins on each side are to be user defined, is this possible?
7
votes
1answer
230 views

How does the call stack operated during an interrupt on AVR?

(Specific to the Arduino Uno...) What happens to the stack when an interrupt occurs on an AVR microcontroller and I call a function? Does the compiler inline the code? Does it cache the stack ...
0
votes
1answer
125 views

What is is an “M7” Diode

I know what it is in general terms of course. But I mean specifically what does the M7 mean. I certainly can't just go to digikey and order an M7 diode because such a part does not exist. I'm making a ...
0
votes
0answers
6 views

Problems stacking Arduino Shields [migrated]

I'm trying to stack the Adafruit Data Logger Shield https://learn.adafruit.com/adafruit-data-logger-shield/overview onto a CuteDigi Sim900 GPRS Shield so that I can upload data (collected eventually ...
0
votes
0answers
12 views

DhcpAddressPrinter Example Has No Output in Serial Monitor [migrated]

I am new to the Ethernet shield, and I tried to use the DhcpAddressPrinter example but I can't get any output. What I did was.. I connected the ethernet shield to the router using my Ethernet cable ...
0
votes
1answer
63 views

Arduino Based Home Automation System

I am working on my project of home automation system using Arduino GSM SIM900 & four channel relay module. I am facing a problem in my code. Can any one help me on this, SMS is receiving but its ...
0
votes
1answer
102 views

How to switch a 220V AC electric bulb using a relay through Arduino?

My aim is to switch an electric bulb operating at 220v AC. For this purpose I use a 12V DC relay that can operate for 220V appliance according to its data sheet. My relay circuit is as under: ...
0
votes
0answers
30 views

Why does this make the LED flash green? [migrated]

I connected an arduino to an RGB LED, but it isn't working. This is the circuit: I have double-checked everything to make sure that the ports were correct, but it still flashes green when I make ...