Looking for guidance with monitoring 2 proximity sensors

[dougp]

Here's a basic version to illustrate the concept:

Timer counter state change toggle FSM - all at once

There are times you want to know if something’s happening on a regular basis. Typically, this would be some digital sensor going on and off at some regular interval. An example would be checking a switch to know if some rotating mechanism is doing that – rotating. Maybe a pump failed. Maybe the water stopped flowing. Whatever the cause, if the pulses come in below some threshold rate an alarm is to be raised. The concept to realize this is called a retriggerable or watchdog timer. Here’s a link …