Hello. I’m new to the site so apologies if this is the wrong place for this post.

Ive been trying to find either a pre built module or circuit for a thermostat with one momentary on and one momentary off output.

I have a diesel powered air heater with a remote control that has on and off monetary buttons. The unit has its own thermostat control but for the situation I’m using it in even the lowest setting heats the room to much. So I’m looking to have an on/off switch linked to an external thermostat.
My plan is to piggyback the thermostat outputs to the tactile switches on the remote so when the thermostat reaches a predetermined temperature it switches the heater off and visa versa to turn the unit on. The thermostat outputs need to be on for approximately 1 to 2 seconds
I’d be very grateful if anyone knows of an existing unit or a simple circuit diagram to make something to do the job.

Many thanks in advance.

What you are asking should be clear, or at least I understood your question. I'm new to the forum, but I found a youtube video that describes exactly what you need. A momentary 'on' and a momentary 'off' when the thermostat reaches desired setpoints. This can work with single button 'on/off' or dual button 'on/off' controls. Search "Luke Fugate" and when you find his channel, the video is "improved diesel heater thermostat." The guy is not an electronic expert per se, but all the information is there including diagram for connections. Definitely worth a thumbs up. You will require two timers (known as interval timers in this application) with adjustable time delay, and available online for about $20 for both. A basic house thermostat or other thermostat of your choosing is used for control. Hope this helps, James M.

 

If this isstill unsolved, a simple solution has come to mind. Given that the goal is to add an external thermostat to the remote, and assuming that the remote is battery powered, and thus DC circuits, and guessing that the remote is quite low powered, the solution thermostat would need to have both hot and cold side contacts. Switching with a capacitor in series with the contact will provide the equivalent of a short button press during the time the capacitor charges. For such a low powered application I suggest a 0.1 MFD capacitor that does not need to be rated any higher than the battery voltage for the remote. So that means probably a 5 volt rating on the two capacitors, because you need one for both on and off buttons.
That is about as simple as I can make it.