ESP32 power consumption during sleep

Other Hardware 3rd Party Boards
1

I was trying to have power consumption as low as possible during deep sleep.
I observed however that the power consumption with a pin floating (GPIO0 to LED->resistor->GND) was lower than adding the following lines to keep its state LOW during sleep:

  digitalWrite(0, LOW);
  gpio_deep_sleep_hold_en();
  gpio_hold_en(GPIO_NUM_0);

I cannot find any explanation on this so far. Why is this? It is a development board with 38 pins.
I think that it might be because of the usb to serial converter?

2

Could be, GPIO0 is often connected to the USB to Serial converter in order to switch to program upload mode.

3

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