Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software. It's intended for artists, designers, hobbyists, and anyone interested in creating interactive objects or environments.

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1answer
31 views

Small low-power device-to-device proximity detector

I would like to find or create a small low-power proximity detector to tell a device when another device is near. This would be coupled to a small microcontroller like the AT-tiny 45. It doesn't ...
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2answers
34 views

ACS712 to Arduino Due ADC input

I want to read the armature current of the brushed DC motor. I am using the current sensor ACS712 20A. How can I feed the output of sensor to Arduino Due analog input pin (A0) to read its digital ...
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0answers
37 views

How to amplify the signal of a TCRT5000 phototransistor

I'm trying to read the IR signal from my Itron C1S Power meter. It has an emitter that lights up for 10 ms every Wh of consumption. This question is based on my prior question: Use a photoresistor ...
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1answer
61 views

1000:5 current transformer: how to calculate burden resistor? [duplicate]

I want to calculate burden resistor for a 1000:5 current transformer. I want to output 5V variation. How do I calculate this burden resistor? I using burden resister 220orm .this is out put .input ...
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0answers
11 views

ATTiny85 Interrupt id vs pin when programming with Arduino [migrated]

I am using an Arduino Uno with the Arduino as ISP sketch to program an ATtiny85. I followed this tutorial to set up to program the ATtiny, and successfully got it to run Blink and an interrupt-free ...
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1answer
66 views

Self-made Arduino pushbutton bank not working

So I'm trying to make a 5 key keypad like circuit, but with increased tactile feel, so I forwent actual store bought pushbuttons. I rigged up keys with some aluminum foil and pieces of plastic and ...
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0answers
49 views

Uploading bootloader on ATmega328P SMT package using Arduino Uno [migrated]

I have been trying to upload bootloader on ATmega328P SMT package on a custom PCB using Arduino Uno as ISP, I was quite successful. I have Googled a lot and have tried numerous ways, sometimes I was ...
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0answers
7 views

Arduino Digitalwrite for while loop set [migrated]

My question is simple. Does Arduino set the digitalwrite() the moment it is called or at the end of the while loop. E.G. `int ledPin = 13; void setup() { pinMode(ledPin, OUTPUT); } void loop() ...
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2answers
56 views

Is it possible to power an Arduino Uno with a Raspberry Pi?

I have an Arduino Uno and a Raspberry Pi that I'm using to control some LEDs in a computer case. Power is coming from a Molex connector from the computer's PSU. I want to place the Arduino and the Pi ...
3
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0answers
49 views

Help reverse engineering a CRC-8 [closed]

I have an arduino based home temperature monitoring system using Ambient Weather F007th wireless Thermo-Hygrometers as sensors. I am trying to work out the CRC and add some code to my project to ...
1
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2answers
180 views

Can I run matlab on a microcontroller?? and if yes which one?

I am working on a complicated robotics project which involves MATLAB image processing algorithm and LEGO MINDSTORMS interface as well as an Arduino. The system works dependently in a sequence ...
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0answers
57 views

Why is there a voltage spike when Arduino resets?

An Arduino is powered by a AC/DC converter and reads voltage from a sensor. Why does the voltage reading spikes up really high whenever Arduino is reset? In this scenario, Arduino is used as a ...
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2answers
90 views

How to detect whether a bathroom stall is closed?

I've got a bathroom stall with a sliding bolt and would like to detect when the door is closed and locked. I'll receive the state of the door with an Arduino Uno Not sure what's the best way to go ...
1
vote
1answer
83 views

Arduino 433MHz transmission fails if falling edge is less than 122ms

I am trying to control a LED using a high-power 433MHz transmitter receiver pair, with transmitter connected to my Arduino Nano. Here is the transmitter (XLPCF20): ...
2
votes
6answers
133 views

Control a lot of IR sensors with Arduino / Build a game board tile

Is it possible to control a lot (let's assume 100) of TCRT5000 IR distance sensors with one Arduino? So just use one or a few pins but not 100? I am relativly new to the Arduino/electronics area and ...
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2answers
65 views

How can I flash an AVR using an Arduino without using Arduino IDE?

I want to program an ATTiny microcontroller using an Arduino Uno board via AVRdude. According to the Arduino Uno schematic, there is a direct line from the USB controller to the ICSP1 header: I ...
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votes
5answers
106 views

Can a proximity sensor read through fabric?

I am trying to build an arduino project with the following requirements: Proximity sensors detect human presence and its distance The sensors are hidden behind fabric Range has to be 1-3 meters or ...
2
votes
2answers
76 views

Interfacing incompletely documented logic signal where resistor affects output voltage level

So I've got this marginally documented 12V logic signal from something I have to regard as a black box that I'd like to interface to a pi or arduino (i.e. c 3V). I have 3 lines - 0V, +12V and signal ...
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2answers
75 views

A simple device to remotely alert someone [closed]

We are developing a solution that can remotely alert someone around a relatively small area (around 300 meters). Each user will carry a sort of pager. The server will send an alert to the device. The ...
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2answers
102 views

Long range Arduino communication

The project must be able to detect the amount of water in tanks and transmit the information to a farm house it must be wireless and unfortunately there is no cell phone reception in the places that ...
0
votes
0answers
7 views

Arduino Custom Function Problem [migrated]

I am experiencing problems when I put parts of my code into custom functions and then have Arduino Mega 2560 run it. The code works fine when I put it all in the void loop() function, but when I ...
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3answers
369 views

LED burned on Arduino

I connected a green LED to pin 13 and digital GND on Arduino Uno R3. pinMode was set to ...
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2answers
65 views

How do you power 6 servos

I have 6 MG996 series servomotors. A single motor can be controlled by an Arduino board using a 5V power supply. Some specifications Running Current 500mA - 900mA @ 6V Stall Current 2.5A @ 6V ...
3
votes
1answer
225 views

What are the contact pads near the ATmega32 chip on the Arduino Yun?

What are/What use have these pads near the ATmega chip? I thought they are used for testing or something else, they seems to expose the ATmega traces directly. Maybe they can be useful to connect ...
4
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1answer
63 views

How many AVR's on an Arduino Leonardo?

What is going on here? According to the circuit diagram there are two microcontrollers (U1 and U2, with slightly different partnumbers) on the Arduino Leonardo, but when I take a look at the PCB I can ...
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1answer
45 views

Control relay from Bluetooth on ATtiny85

I know someone else has made a Bluetooth transmitter to a relay so i wanted to ask a few questions about it being possible? I am an almost newbie at electronics but i do know a few things, so first of ...
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3answers
64 views

Switch between two digital signals with no microcontroller

I'd like to use an Arduino to send wirelessy (RF 433MHz, probably) two different digital signals to pilot two different relays (later they will be much more). I know probably this is something very ...
1
vote
1answer
26 views

Why can't I read the 328p from an Arduino board using USBasp?

I have been using a USBasp board and avrdude to successfully program Attiny13 chips. I thought I'd have a look at the chip from my Arduino (ATMega328p), but avrdude can't seem to read the chip. ...
1
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1answer
27 views

Specs of HK-TR6A remote controller receiver

I'm trying to use a 2.4 GHz digital 6 channel remote controller to send signals to an Arduino UNO R3 board. The receiver is the HK-TR6A-V2. I can't find any information on what each pin input/output ...
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1answer
41 views

Why does my Arduino DUE not recognize my external interrupt?

I'm simply trying to get my Arduino DUE to toggle a pin based on an external clock. I have a 14.31818 MHz Oscillator that is ...
0
votes
1answer
39 views

125kHz RFID output interpretation

I'm using the RDM6300 125kHz reader module in combination with Arduino Uno to read my tags. The tags themselves have their ID as a label. When I then try to read the cards, I receive another ID as ...
0
votes
1answer
51 views

Calculationg base-resistor between microcontroller and transistor

I'm curious, when connecting my 2N2222 transistor's base to a PWM output pin on my Arduino, I know the Arduino can deliver a maximum of 40mA current. The 2N2222 only requires around 5 to 10 mA on it's ...
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1answer
80 views

TIVA C series launchpads for arduino programmers

I have bought a Tiva C series Launchpad TM4C1294NCPDT by TI and wish to do a project on face recognition. I will soon get a DSP EVM by TI, but still confused which one to choose (MAY be the one with ...
0
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1answer
43 views

Use Arduino to Plot the balance of my airplane propeller using optical sensor and reflective tape

I would like to use an arduino to determine how out of balance my airplane propeller is. I've seen a production device that uses an optical sensor and reflective tape to plot this. Can this be done ...
0
votes
1answer
32 views

using ICL8038 waveform generator IC with arduino uno

How do I use the ICL8038 waveform generator IC with arduino uno ? I have been trying to find apt resources but I find either the IC being used without the arduino uno or resources explaining how to ...
0
votes
1answer
56 views

Powering circuit and Arduino with single power source

I am trying to power an Arduino Uno as well as my circuit using Li-Ion batteries. They are 2 18650 Lithium Ion batteries (rated at 3.4 V each = 7.4 V total). I have this battery plugged into the Vin ...
0
votes
1answer
65 views

Two arduino unit communication

OK plain and simple I'm not sure to use IR or RF. This is short distance up to maybe 10 ft. I have an Arduino Uno that I have all set up here. I press a button and it carries out its code. This is ...
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0answers
10 views

Issues programming Arduino Uno with Sparkfun's MAX2323 breakout board [migrated]

I'm having an issue programming the Arduino Uno with Sparkfun's MAX2323 breakout board attached. Sometimes the Arduino IDE won't see the Uno plugged in. I'm thinking of connecting a switch to the ...
0
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0answers
8 views

arduino serial port programming [migrated]

I bought an arduino-on-breadboard kit. I have several pc with serial ports, now I'm being told I need a usb to serial converter? I thought I was ready to start uploading sketches, please advise. I'm ...
0
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0answers
37 views

Rechargable battery solution for Arduino Uno

I am currently working on a project including an NFC Shield and a Bluetooth Shield intend on making the project wireless. My question is; Are there any battery solutions that allow me to ...
1
vote
3answers
71 views

What is SPI Interrupt (SPIE) in SPI control register?

I have been trying to understand SPI Interrupt i.e. what does it do and why is it used ? Reading about it on the web has not helped me. Can some one please explain it in a simple terms ?
1
vote
1answer
56 views

Beam sensor or other switch needed for electric blind project

I am designing a motorised blind (powered by a Raspberry Pi) and need a reliable way of detecting when the blind is fully "up" or "down". I don't want to use a stepper motor, and rely on counts, as I ...
1
vote
0answers
33 views

Can I change VCC pin to 3.3V on a 5V Arduino Pro Micro? [migrated]

I'm using a 5V Arduino Pro Micro (schematic). For my project, I'm using the VCC pin to output power to an external device. I need VCC to output 3.3V to the external device. Can I open jumper SJ1 to ...
1
vote
0answers
10 views

Controlling Floppy Disk Drive with Arduino [migrated]

I am having problems controlling a 3.5" Floppy Disk Drive with an Arduino Uno. I have the floppy disk drive powered with a computer power supply that is switched on, and the Arduino powered by my ...
1
vote
1answer
81 views

How do I hook up an LED across the tx pin on my Atmega328?

I've built a standalone Arduino and upload sketches via this method From Arduino to a Microcontroller on a Breadboard. I would like to hook up an LED across TX like on the Arduino board, so I simply ...
0
votes
1answer
53 views

Two op amps from a single input voltage

I have an output of an LM741 of +-2.5V, I have two more LM741's I wish to take this signal into an arduino due, once with a range of 0-3.3v to get a wide span and then chop the peak off the original ...
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votes
0answers
24 views

Send multiple data to Xively client

This is my first time using GSM shield send data to Xively client. I have read through the example from Arduino tutorial and merge the code together with mine. I managed to send one data over to ...
1
vote
2answers
178 views

What's the deal with a bootloader?

I am planning to buy an ATmega328 chip from Atmel, place it in my Arduino board, program it, detach it later, then solder onto a PCB. Can I just buy the chip and program it on the Arduino board, or ...
0
votes
0answers
8 views

Adapt program to suit Arduino UNO [migrated]

I am trying to use a program that has been written for STM32 microprocessor for interfacing with a Time to Digital Converter TDC GP22 via SPI interface. I would like to use the same program and adapt ...
0
votes
1answer
69 views

Constant Current Square Wave through LED

I am running a somewhat powerful LED, on the order of 3.5V 500mA, off of an ~11V battery using a constant current switched mode power supply from Ebay that uses the LM2596. What I need to do now is ...