A tiny daemon for controlling a single RGB Led for Raspberry Pi written in Python.
While this daemon requires being sudo to start it, it doesn't require being sudo to change color and blink state of the LED in the GPIO.
For starting the daemon, type:
sudo python rgbled.py start
You can change color by typing the color:
python rgbled.py color blue
You can turn blinking on by typing:
python rgbled.py blink on
For stopping the daemon, type:
sudo python rgbled.py stop
This code uses GPIOs 5, 6 and 13, which are the pins 29, 31 and 33 in the Raspberry Pi 2 Board. Pin 6 is the GND on the same board, and I'm using it.
My pin selection comes from the example right here: https://www.hackster.io/windowsiot/rgb-led-sample . Your RGB Led may be different.
Right now every time you call the script is called using color or blink, it
uses writing on /tmp/ to communicate with the daemon.
So I recommend mounting /tmp/ on RAM. To do this, is simple, first, edit the
raspberry pi fstab. If you are away, just connect in it using ssh.
To edit the fstab use sudo nano fstab . Once you are connected, add the following
line:
tmpfs /tmp tmpfs defaults,noatime,nosuid,size=100m 0 0
Than, just reboot with sudo reboot.
If you want to check if you have already done it before, just use mount or df -h.
I would like to point the following article as source: http://www.zdnet.com/article/raspberry-pi-extending-the-life-of-the-sd-card/ and also thank to dAnjou.
To avoid this, I'm planning to change this communication, but don't know how to right now.
This code uses Sander's Python Daemon from here: http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/ .