Uses a switch to turn a DC motor on and off

DC-motor.ino

const int switchPin = 2;
const int motor1Pin = 3;
const int motor2Pin = 4;
const int enablePin = 9;

void setup() {
    pinMode(switchPin, INPUT);
    pinMode(motor1Pin, OUTPUT);
    pinMode(motor2Pin, OUTPUT);
    pinMode(enablePin, OUTPUT);
    analogWrite(enablePin, 100);
}

void loop() {
   int switchVal = digitalRead(switchPin);
   if(switchVal == HIGH) {
     digitalWrite(motor1Pin, HIGH);
     digitalWrite(motor2Pin, LOW); 
   }
   else {
     digitalWrite(motor1Pin, LOW);
     digitalWrite(motor2Pin, LOW);
   }
}