TTGO T-Beam topic

[bluejedi]

FYI, see:

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

T-Beam V1.0 measuring only 1.8V on the 3.3V pin I have two T-Beams, a V0.7 and a V1.0. Got the V1.0 recently and haven’t used it much yet. I have 0.96" OLED displays connected to both T-Beams and the display on the V1.0 is much dimmer. Switching the displays made no difference. Whatever the display, the one on the V1.0 is always much dimmer. The displays are connected to GPIO 21, 22 and the GND and 3.3V pins next to GPIO 22. When measuring the 3.3V pins of the V1.0 board it shows only 1.8V. …

@Linar

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);

The axp.setDCDC1Voltage(3300) fixed it.