We started with wanting to debounce a mechanical switch, and now we have the ability to debounce any zero-argument predicate function/lambda. From this we can get stable boolean values, as well as being informed when that stable value charges and in which direction (i.e. rising or falling)
We can use a debouncer for these three things even if the signal may not be all that noisy. Think about a temperature monitor that has an acceptable range. We can use a debouncer to monitor whether the temperature is in (or out of) that range.
Let's say we need to know if/when the temperature exceeds 30C and when it returns to an acceptable value. Maybe we turn a fan on when it's too hot and off when it's ok. On a Circuit Playground Express we could do something like:
import adafruit_debouncer
import adafruit_thermistor
import board
thermistor = adafruit_thermistor.Thermistor(board.TEMPERATURE, 10000, 10000, 25, 3950)
in_range = adafruit_debouncer.Debouncer(lambda: thermistor.temperature <= 30)
while True:
in_range.update()
if in_range.fell:
print('High temperature alert')
elif in_range.rose:
print('Temperature ok again')
You can use a debouncer and an appropriate lamdba to monitor any sort of threshold like this.
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