Swaps the direction in which a DC motor is rotating when a switch has a HIGH input

DC_Motor_Control.INO

const int switchPin = 2;    // switch input
const int motor1Pin = 3;    // H-bridge leg 1 (pin 2, 1A)
const int motor2Pin = 4;    // H-bridge leg 2 (pin 7, 2A)
const int enablePin = 9;    // H-bridge enable pin

void setup() {
    // set the switch as an input:
    pinMode(switchPin, INPUT);
    
    // set all the other pins you're using as outputs:
    pinMode(motor1Pin, OUTPUT);
    pinMode(motor2Pin, OUTPUT);
    
    // set enablePin high so that motor can turn on:
    analogWrite(enablePin, 850);

    Serial.begin(9600);

}

void loop() {
    // if the switch is high, motor will turn on one direction
    if (digitalRead(switchPin) == HIGH) {
      // set leg 1 of the H-bridge low
      digitalWrite(motor1Pin, LOW);
      // set leg 2 of the H-bridge high  
      digitalWrite(motor2Pin, HIGH);

      Serial.print("High");
      Serial.print("\n");
    }
    // else (which means the switch is low), motor will turn in the other direction
    else {
      // set leg 1 of the H-bridge high
      digitalWrite(motor1Pin, HIGH);
      // set leg 2 of the H-bridge low
      digitalWrite(motor2Pin, LOW);

      Serial.print("Low");
      Serial.print("\n");
    }
}