Domochip

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No stove connection during initialization byte 0x201c in iGetStatusAtech function

OK, log is going out of D4 pin at 38400bps First you can have look at what's logged. Do you know how to create a platformio/arduinoIDE project and compile it?...

No stove connection during initialization byte 0x201c in iGetStatusAtech function

What output do you get?

No stove connection during initialization byte 0x201c in iGetStatusAtech function

baudrate is 38400bps

No stove connection during initialization byte 0x201c in iGetStatusAtech function

the log is coming out of the D4 pin. you need an additionnal serial adapter connected to GND and D4 to receive the log

No stove connection during initialization byte 0x201c in iGetStatusAtech function

no problem ;-)

No stove connection during initialization byte 0x201c in iGetStatusAtech function

do you have a logic analyzer?

No stove connection during initialization byte 0x201c in iGetStatusAtech function

The goal is to monitor exchanges on tx AND rx of the d1mini with real timing. That's the ultimate solution to debug what's happening. Another idea would be to use...

No stove connection during initialization byte 0x201c in iGetStatusAtech function

Hello, could you also try to remove R8 resistor or D3 led?

No stove connection during initialization byte 0x201c in iGetStatusAtech function

also what's your si8621 exact model (2 letters after 8621)?