const int SENSOR_L = A0;   // left op-amp output
const int SENSOR_R = A1;   // right op-amp output

void setup() {
  Serial.begin(115200);
  analogReadResolution(12);   // RP2040 uses 12 bits 
}

void loop() {
  int leftRaw  = analogRead(SENSOR_L);   
  int rightRaw = analogRead(SENSOR_R);   

  // Output BOTH values for Arduino Serial Plotter
  Serial.print("Left:\t");
  Serial.print(leftRaw);
  Serial.print("\tRight:\t");
  Serial.println(rightRaw);

  delay(10);   // about 100 Hz update rate
}