Q5. Is there feedback from the so-called Target device that indicates its state? As I understand it, the secondary circuit controls the Target device. From what I can infer so far, the Target device has only 2 states which for the sake of argument I'll call ON and OFF. You press the pedal and the Target device turns ON, you release the pedal and the Target device turns OFF. IF (big IF) there is such a feedback signal from the Target device then it becomes a fairly simple implementation with only two conditions or "rules" to follow:
IF the Target is OFF, then generate a 0.2 sec (or whatever) pulse in the secondary circuit when the pedal goes from released to pressed.
IF the Target is ON, then generate a 0.2 sec (or whatever) pulse in the secondary circuit when the pedal goes from pressed to released.
Q6. Is there a "fail-safe" requirement to detect a stuck state? For example, let's say the TBD circuit detects the pedal has been pressed for 100 hours (or whatever). This might be indicative of failure mode and, for example, the circuit should just go ahead and generate a 0.2 second pulse to the secondary circuit...or turn on a relay to activate an audible/visual alarm or whatever. No matter the implementation (even an Arduino), if this is a mission-critical system it is common practice to include fault-tolerant mechanisms to cover corner cases and the like.
