karatektus/rgbleddaemon

A tiny simple daemon for controlling a single RGB Led for Raspberry Pi written in Python.

RGBLedDaemon

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.

Usage

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

Schematic

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.

Warnings

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.

Dependencies

This code uses Sander's Python Daemon from here: http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/ .