Add status LED(s) #2
Description
It would be nice to know in which state the system is currently:
- on / off or automatic / manual mode
- pumping (in case the motor is dead you would still see that the ESP is trying to pump)
- direction of pumping
- errors (like being in failsafe state after motor has been running longer than x seconds)
- warnings (like when the sensor is close to the threshold. once the electrodes are corroded, we can't detect when they're in water anymore)
needs a concept how to encode these things with a minimal number of LEDs