WiringPi is a C language library for accessing GPIO pins.

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WiringPi: using interrupts with Python

I want my RaspberryPi to perform some actions when the light in a room is switched on or off. To do so, I connected a photocell to the GPIO pins. Previously, I used some python 3 program that queried ...
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wiringPiSetupSys - input pin state does not change

I try to port my GPIO project from quick2wire to WiringPi. My aim is to read the state of a photocell connected to pin 24 of my raspberry pi (model B, revision 2). My code (python 3) looks like this: ...
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GPIO23 (BCM) is busy when using /sys/class/gpio but I am able to use wiringPi pin 4 (GPIO23)

I'm having a bit of trouble accessing GPIO23 using /sys/class/gpio/. To clarify a few terms (according to the table on this page): Header pin 16 is BCM GPIO 23, which is wiringPi pin 4. Header pin ...
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How can I get an SPI ADC (MCP3002) on RPi2

I would be happy if you give me a advice or show me the sample code. One year before, I wrote a luminosity sensor application on my RPi model B in Ruby. Thanks to the this library I could make app ...
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How to run 2 servos with wiringpi2 on Raspberry pi 2

Hello I want to use 2 servo with different gpio pins. But Raspberry has one hardware pwm (GPIO 18). first of all I tried another pin to run servo and my code: wiringpi.pinMode(18,2) ...
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Cannot open 12V Solenoid Valve

I am a beginner in DIY electronics, and I am attempting to control a 12V Solenoid valve from a Pi B2 connected to a 12V Battery and WiringPi Pin 1. I am using a 1kOhm Resistor between the gpio pin ...
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Infinity cascade IO expand module [closed]

Has anybody used Infinity cascade IO expand module for Raspberry PI? Like the one described here http://www.bananapi.com/index.php/purchase/2-uncategorised/36-banana-pi-io-extend-board, but only red. ...
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Can we determine the mode of a GPIO pin?

As I understand it, the mode of a GPIO pin can be INPUT or OUTPUT (and I think there may be other modes such as PWM and I2C). I believe that the mode of a pin is a global and that if two applications ...
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How do I access the Wii Nunchuck using WiringPi

The Wii nunchuck is an I2C accessible device and can be wired to the I2C pins of a Pi. How do I read the data from a Wii nunchuck in C using the WiringPi library?