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Xinyuan-LilyGO / LilyGo-LoRa-Series

LILYGO LoRa Series examples
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DCDC1 and DCDC3 #107

Closed fastfourier666 closed 8 months ago

fastfourier666 commented 8 months ago

Hi,

I'm trying to build a "shield" board with an external component that I want to turn on and off with the AXP192 on the T-beam 1.1.

From the schematic, DCDC3 supplies the 3.3V power to the ESP32 via R55 0 ohm link and DCDC1 is available on the two "VCC_2.5V" pins on the connector.

Due to R54 ("NC"/not connected) it would seem that DCDC1 does not go anywhere else apart from the connector pins.

But when I turn off DCDC1, the board powers off.

Is DCDC1 feeding something else important?

fastfourier666 commented 8 months ago

Sorry, this was my mistake. I think it's something wrong with the library I was using.

When I got the failures I was not actually turning DCDC1 on and off, but reducing the voltage. I think the library was also setting DCDC3 for some reason.

If I use the library's enable/disable function on DCDC1, it turns off as expected and the ESP keeps running.

Sorry about that!