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Top new questions this week:

Equivalent for PORTB in Arduino Mega 2560

Like I said in the subject, I would like to know the equivalent for the instruction: PORTB |= 0x01; PORTB &= ~0x01; More precisely I was using it to trigger a fast pulse conversion on my ...

arduino-mega port-mapping

asked by Francesco Pegoraro 4 votes answered by Edgar Bonet 4 votes

How to multiplex multiple displays?

I want to use 2 "displays" with 4 digits. The displays are common cathodes with cathode transistors connected to the digits, as the figure: The segments of both displays are connected together on the ...

arduino-mega multiplexer 7-segment

asked by user29787 3 votes answered by st2000 2 votes

avrdude: stk500_recv(): programmer is not responding - OSX10.11

I'm getting the following error with a genuine Arduino Uno on Mac OSX10.11 El Capitan when uploading to it (the green light is on, the orange light flashes intermittently while attempting to upload). ...

arduino-uno ftdi programmer

asked by Agent Zebra 3 votes

Multiple tones with one piezo buzzer

I have figured out how to make a piezo buzzer play two tones at once with analogWrite() and tone() but how would I make an actual song by playing both bass and treble, such as this one. Here is the ...

arduino-uno pwm piezo

asked by Amorris 2 votes answered by gilhad 1 vote

pulseIn() function not working

I want to find the length of upper one signal (purple one). So for that, i used pulseIn() function for that. But i just get 0 as a result in serial monitor. int pulsepin = 8; int value = 0; void ...

arduino-uno arduino-ide

asked by Hasan 1 vote answered by jfpoilpret 2 votes

Arduino pro mini (clone) @1Mhz target does not answer

Recently I have been experimenting with battery powered sensor (mySensors). I created node with 3.3V Arduino Pro Mini (ATMega328P @ 8Mhz with nordic radio chip and BME280 sensor) and successfully ...

programming arduino-pro-mini usbasp

asked by MightyPolo 1 vote

How to: Connecting 4-pin Joystick to Arduino board

I am completely new at Arduino. I have a joystick: It is however quite different from all the other joystick-tutorials, as their joysticks have 5 pins, not just 4. So I am quite at loss here. How ...

joystick

asked by andrew 1 vote answered by jwpat7 1 vote

Greatest hits from previous weeks:

Parse JSON with arduino to turn on LED

Hi i'm trying to parse JSON resposne from webserver in my arduino in order to turn on and off a LED light. I'm using the wifi client repeating example to make a get request to my server: ...

arduino-uno shields wifi

asked by user1424508 14 votes answered by sachleen 8 votes

How to toggle LED on button press?

I want to have a LED turn on when I push a button and go off when I push the button a second time. This code doesn't work: const int buttonPin = 4; const int motorPin = 10; const int ledPin = ...

button

asked by Julian Köberle 1 vote answered by Peter Bloomfield 5 votes

Can you answer these?

Flash String Helper object as variable

So I have a Bunch of commonly used char arrays to build commands in my library. So to preserve memory, I have them put into flash, via PROGMEM ext, typedef const char PROGMEM ProgChar; ProgChar AT[] ...

arduino-uno esp8266 flash progmem

asked by Steven Venham 1 vote

How to create a heart rate detection system that uses a chest strap?

I want to create a system that uses a chest strap from available Bluetooth-based heart rate monitoring systems. The straps seem very convenient compared to available Arduino pulse detection systems ...

sensors

asked by rur2641 1 vote