GPIO controls for Rasbperry Pi

Libraries for GPIO

Node JS

Python

Using RPi.GPIO

• How to Exit GPIO programs cleanly, avoid warnings and protect your Pi
• Setting up RPi.GPIO, numbering systems and inputs
• On using hardware PWM without sudo due to permissions for /dev/gpiomem: discussion

General

pigpio

The library also provides a service. It can be useful if you don’t want to give root access to the client applications and want to control PWM for example.

Here is how to create a system service for pigpiod:

Create file /etc/systemd/system/pigpiod.service:

[Unit]
Description=pigpiod service

[Service]
ExecStart=/usr/bin/pigpiod -g -n localhost

RestartSec=5
Restart=always

[Install]
WantedBy=multi-user.target

run and check status

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sudo systemctl start pigpiod.service
sudo systemctl status pigpiod.service

should be something like this:

● pigpiod.service - pigpiod service
   Loaded: loaded (/etc/systemd/system/pigpiod.service; enabled; vendor preset: enabled)
   Active: active (running) since Wed 2018-09-19 12:22:30 UTC; 1s ago
 Main PID: 10074 (pigpiod)
   CGroup: /system.slice/pigpiod.service
           └─10074 /usr/bin/pigpiod -l -g

Now enable the service:

sudo systemctl enable pigpiod.service

Now pigpriod has to run on startup of your raspberry pi and provide interface to gpio:

pigs w 4 1

If something went wrong and the pigpiod service doesn’t start you will see

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$ pigs w 4 1 
socket connect failed