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    1. · Registered
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      685 Posts
      Right? I feel the urge to just build my own after staring at all the options for a couple days. But for $110 with everything, I feel pretty good about giving it a go. Then I can decide whether to build my own - with a better interface - some other time. 🤷‍♀️
      You could get real simple and go 433 wireless:
      https://smile.amazon.com/Wireless-T...keywords=wireless+relay&qid=1634182984&sr=8-3



      There's better looking switches that mount on the wall that you could pair to it. NO WIRING AT ALL. These are battery powered. I used them in my RV.
      433Mhz Wireless Light Switch RF Remote Control 86 Wall Panel Transmitter E6D2 | eBay
       
    1. · Registered
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      1,479 Posts
      If you want to do the absolute cheapest way with off the shelf parts (more off the shelf than an ESP32 board) something like this should work:


      That would be what triggers the non-CAN relay-based Espar to start.

      I've got a China-spacher diesel heater so am going the ESP32 route. I'm hoping I can learn the signaling on the wires from the Afterburner community, though the designer mentioned someone started selling knock-off's using his design and code so I may be on my own.
       
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