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PowerSwitch

Python program to control relay connected to GPIO.

Check usage:

python powerswitch.py --help

usage with Shairport-Sync

If powerswitch.py needs to cooperate with audioboards stacked on top of GPIOs, consult the documentation. Some of the GPIOs are reserved by board:

Edit configuration file /etc/shairport-sync.conf. Modify sessioncontrol section:

// Advanced parameters for controlling how a Shairport Sync runs
sessioncontrol = 
{
run_this_before_play_begins = "/usr/bin/python /home/pi/powerswitch/powerswitch.py --relay-pin 16 --power-on";
run_this_after_play_ends = "/usr/bin/python /home/pi/powerswitch/powerswitch.py --relay-pin 16 --power-off --delay 600";
};

Set correct pin number.

Remember to grant access to GPIO for user shairport-sync. Add him to gpio group.

sudo usermod -a -G gpio shairport-sync

Finally, restart shairport-sync service:

sudo service shairport-sync restart