M5StampS3：GPIO3 Analog input don't work

gohan_oishii

I am using the analogue input with the M5Stamp S3, but GPIO3 is constantly outputting 4095.
Other outputs give the correct values.
I use Arduino IDE 2.3.3, and the code is

void setup() {
  Serial.begin(115200); 
  for(int i=1;i<=15;i++){
      pinMode(i,ANALOG);
  }
}
void loop() {
    
   int index = 0; 

  for (int pin = 1; pin <= 15; pin++) {
    v[index] = analogReadMilliVolts(pin); 
    Serial.print(String(v[index]));

    if (index < 13) { 
      Serial.print(",");
    }

    index++; 
  }

  Serial.println(); 
  delay(1000);
    
}

felmue

Hello @gohan_oishii

GPIO3 on the ESP32S3 is a strapping pin (see here) and is pulled up via external 10 k resistor (see schematic here).

Thanks
Felix

teastain

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