• When I do analogRead(33), I get the same values whatever I send the signal on G33 or G23
• When I do analogRead(23), I receive no signal on G33 and G23

What am I missing?

#if !defined(ARDUINO_M5Stick_C)
#error Wrong target platform (M5StickC - M5Atom)
#endif

#include "M5Atom.h"
#include "pixelTypes.h"

uint8_t pinNorth = 33;
//uint8_t pinSouth = 19;

void setup()
{
M5.begin(false, false, true);
Serial.begin(115200);
}

void loop()
{
int readValue;
int ledValue;

// Read the North pin
readValue = analogRead(pinNorth);
ledValue = map(readValue, 0, 4095, 0, 255);
Serial.print("- North: ");
Serial.print(readValue);
Serial.print(" -> ");
Serial.println(ledValue);

M5.dis.drawpix(2, ledValue);
M5.dis.drawpix(6, ledValue);
M5.dis.drawpix(7, ledValue);
M5.dis.drawpix(8, ledValue);

delay(10);

// Read the South pin
// readValue = analogRead(pinSouth);
// ledValue = map(readValue, 0, 4095, 0, 255);
//
// Serial.print("- South: ");
// Serial.print(readValue);
// Serial.print(" -> ");
// Serial.println(ledValue);
//
// M5.dis.drawpix(16, ledValue);
// M5.dis.drawpix(17, ledValue);
// M5.dis.drawpix(18, ledValue);
// M5.dis.drawpix(22, ledValue);
//
// Serial.println("");
// delay(10);
}