TPA3110 2x15W Amplifier

// Canonical beginner example for the TPA3110 2x15W Amplifier
// This sketch generates a simple left/right test tone using PWM on pins 9 and 10.
// Connect the amplifier inputs to the Arduino, and wire speakers to the amplifier outputs.

const int leftPin = 9;   // Connect to L
const int rightPin = 10; // Connect to R

void setup() {
  pinMode(leftPin, OUTPUT);
  pinMode(rightPin, OUTPUT);
}

void loop() {
  // A basic stereo test: left channel gets a pulse train, right channel stays quiet,
  // then the roles swap. The amplifier board will filter the PWM into an audible tone.

  // Left channel active
  for (int i = 0; i < 200; i++) {
    analogWrite(leftPin, 180);
    analogWrite(rightPin, 128);
    delayMicroseconds(400);
    analogWrite(leftPin, 0);
    analogWrite(rightPin, 128);
    delayMicroseconds(400);
  }
  delay(300);

  // Right channel active
  for (int i = 0; i < 200; i++) {
    analogWrite(leftPin, 128);
    analogWrite(rightPin, 180);
    delayMicroseconds(400);
    analogWrite(leftPin, 128);
    analogWrite(rightPin, 0);
    delayMicroseconds(400);
  }
  delay(300);
}