xfpd
5
Yes.
Read analog sensor https://docs.arduino.cc/language-reference/en/functions/analog-io/analogRead/
Less than https://docs.arduino.cc/language-reference/en/structure/comparison-operators/lessThan
Greater than https://docs.arduino.cc/language-reference/en/structure/comparison-operators/greaterThan/
Counters How to Make a Counter in Arduino | Delft Stack