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check out the videos at www.pitmasteriq.com. they may give you some ideas.

+1 makes 93. After debugging my display, I now have my second HM working. The next one I am going to move to a 3.3 V display with a SPI interface, thereby removing IC3 and possibly removing the expensive 5V interface, and go from 12v directly to 3.3v with a different LDO regulator.

In-circuit resistance measurement is *usually* never valid, because resistance measurement is done by the instrument being a current source, and everything else in the circuit can effect the measurement of the subsequent reading.

remove the probe jack. look for any solder bridges. look on the jack also. test board. with no probe and no current, the voltage on each side of r18 should be 3.3v, and zero voltage when you read across r18 directly (this is a recap of the msgs above). if there is voltage across r18, which side...

if you don't see 3.3v at pin28 with the probe uninstalled, check R18 installation. you should see 3.3v on both sides of it.

Got mine working over the weekend here in Seattle. The board came up no problem. Four-way switch on backorder, but wired Ethernet showed the web interface with rPi correctly, and all settings could be set. The main problem I was having was that in my imperial (original) kamado, the temp was...