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Old 04-15-2023, 05:00 PM   #1
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1973 23' Safari
1977 23' Safari
2018 25' Flying Cloud
Palmer Lake , Colorado
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Fridge controller

Along with my remote leveling parking transmitter (https://www.airforums.com/forums/f38...ks-240057.html), here's a cheap replacement for a fridge controller. Like, have you looked at the replacement cost ($300+) for one?

This controller uses a 100K NTP resistor to monitor the flue temperature, an $11 sparker, a small $3 variable DC-DC buck converter, and an Arduino Pro-mini to turn on the propane valve and provide ignition. All the usual monitoring safety features are included, making sure the propane is turned off if the fire goes out.

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Old 04-15-2023, 05:03 PM   #2
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I have an older fridge in my '73 Safari that doesn't have a controller (it's mechanical). I'm using the leveling transmitter (see link above) to send a signal to the tow vehicle if the burner blows out while I'm towing (doesn't happen every trip, but often enough that when towing for 5-6 hours you would like to know if you need to relight the fridge).

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Old 04-15-2023, 07:47 PM   #3
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Here's the code logic:

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