Code to monitor bilge pump activity via GPIO Input pin on raspberry Pi
I started with this circuit:
which worked for 12.5v but not for 11.5v. putting two R1 resistors in parallel made the circuit detect the 11.5v condition, need to dial in the circuit... :-/
Your raspberry pi will need a configured mail server listening to
localhost:25 for this to send notifications.
$ vi monitor_bilge.py # edit CONFIG section
$ sudo install -o root -g root -m 0755 monitor_bilge.py /usr/local/sbin/
$ sudo install -o root -g root -m 0644 monitor_bilge.service /etc/systemd/system/
$ sudo systemctl daemon-reload
$ sudo systemctl enable monitor_bilge.service
$ sudo systemctl start monitor_bilge.service
$ sudo systemctl status monitor_bilge.service