olimex / esp32-c3-devkit-lipo Goto Github PK

I see that GPIO 3 has a voltage divider connected to the battery and GPIO 4 is for power sensing of the 5v.

Could you explain how these pins can be used for reading out the battery measurement and the external power?

Especially what are BAT_PWR_E1, BAT_SENS_E1 and PWR_SENS_E1? And how they can be used.
I tried reading them with ADC but I believe that I'm missing out something because I always get 2000 (with 11db atten. set up).

Edit: I saw in the schematic that it's a jumper and it's on the backside of the board.
What jumper should I put there?

I am trying to get a simple sketch running on the ESP32 C3. I am able to upload the sketch successfully but the serial monitor is blank. Any thoughts as to why this might be? I have verified that the serial monitor is set to 115200 as well. As a reference, I am able to successfully load and run the Blink example.

This is the sketch:

void setup(){
  Serial.begin(115200);
}

void loop(){
  Serial.println("Hello from ESP32-C3!");
  delay(1000);
}