Power = 100: standard on
Standard sampling time is 5 seconds.
if power is set to 50%, heating time is 2.5 sec and witing time (gpio off) is also 2.5 sec
Changing power to lower readings, wil reduce heating time within the 5 seconeds and increase waiting time
Increase of power results in longer heating times and reduced wait times
Sort of a poos men's PWM with a fix requency of 0.2 hz
This will reduce the complexity of all PID plugins.
Some additional tests and changes might be required for api.
If sensor is set to active, GPIO pin should be high under normal conditions.
If inverted, GPIO pin should be low when sensor is active.
This logic is aligned with the old craftbeerpi3 GPIOSystem plugin
