DC Motor with Driver (H-Bridge)

void setup(){

pinMode(3, OUTPUT);

pinMode(9, OUTPUT);

pinMode(8, OUTPUT);

pinMode(11, OUTPUT);

pinMode(12, OUTPUT);

pinMode(5, OUTPUT);

}

void loop(){

digitalWrite(9, HIGH);

digitalWrite(8, LOW); //Makes motor A go full speed forward

analogWrite(3, 255);

digitalWrite(11, LOW);

digitalWrite(12, HIGH); //Makes motor B go half speed backward

analogWrite(5, 122);

}

How does an H Bridge work?

Inside the red chip is a circuit called an H-Bridge because it makes the shape of an H. It's designed to provide adjustable voltage to a source. Notice in the above picture, all 4 switches are open. In this case the motor will receive no voltage.

In the pictures below 2 of the 4 switches are strategically opened and closed to drive the motor in a particular direction.

Our code can control which switch is opened and closed and how much power is delivered to the motor.

digitalWrite(9, HIGH); //this closes two of the switches for motor A

digitalWrite(8, LOW); //this opens two of the switches for motor A

analogWrite(3, 255); //this gives all (255) of the power

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