T-Beam V1.0 measuring only 1.8V on the 3.3V pin

End Devices (Nodes) Hardware
5

Just power up of AXP192 outputs (as in example you are referencing onto) could be not sufficient :

axp.setPowerOutPut(AXP192_LDO2, AXP202_ON);
axp.setPowerOutPut(AXP192_LDO3, AXP202_ON);
axp.setPowerOutPut(AXP192_DCDC2, AXP202_ON);
axp.setPowerOutPut(AXP192_EXTEN, AXP202_ON);
axp.setPowerOutPut(AXP192_DCDC1, AXP202_ON);

it is worth to make explicit 3.3V setting for DCDC1:

   axp.setDCDC1Voltage(3300);

You may use this as a reference

I take it they don’t publish a schematic?

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