I wish to connect a humidistat to a remote-control switch for powering on a humidifier. The humidistat has an open circuit until the desired humidity is reached, then it closes the circuit. To tie in with the remote control switch, I need to be able to simulate the pressing of a button in both scenarios: when the humidity reaches the desired level, and when it drops below that level.
Someone suggested a one-shot timer, but if I understand correctly, it is triggered by a pulse, which is the opposite of what I'd like to do.
Is there anything out there that will trigger a pulse when the input is closed, and trigger another pulse when the input is opened again?