aquarium_float_cutoff

MicroPython code to control an aquarium filter- turning it off and sending a pushover notification if a float switch is triggered (to prevent tank overflowing).

Additionally:

• Beeps every X seconds if network is down (see settings inside main.py)
• Beeps every X seconds if the float switch is in an alert state. (see settings inside main.py)
• Sends notifications via Pushover (https://pushover.net) on state changes.

Be sure to set your settings inside settings.py! Use settings.py.example for help

Wiring

• Float switch to 3.3v and GPIO_2
• Buzzer+ to GPIO_4, Buzzer- to GND
• Relay output (in my case, an old PowerSwitch Tail which supports 3.3v logic switching!):
  • Positive to D18
  • Negative to GND

Features

• Non-blocking WiFi connection (if Wifi is down, control still continues!)
• Pushover notifications sent on state changes (startup, alert, recovery)
• Beeps regularly (configurable) if WiFi not connected
• Beeps regularly (configurable) if float switch in an alert state

TODO

• Clean up the code, 'cos this is messy (dupe pushover calls)
• Move stuff to OOP, for better state management in particular

Notes

• Tested with NodeMCU ESP32 board.
• Having the float switch on GPIO_2 has a nice side effect of lighting the LED when in an "OK" state
• Put your settings into settings.py (note that this is excluded in the .gitignore file to stop you accidentally pushing sensitive info!)