Lab 1 - Controlling a dc motor with a potentiometer

const int transistorPin = 9;    // connected to the base of the transistor
 
 void setup() {
   // set  the transistor pin as output:
   pinMode(transistorPin, OUTPUT);
 }
 
 void loop() {
   // read the potentiometer:
   int sensorValue = analogRead(A0);
   // map the sensor value to a range from 0 - 255:
   int outputValue = map(sensorValue, 0, 1023, 0, 255);
   // use that to control the transistor:
   analogWrite(transistorPin, outputValue);
 }const int transistorPin = 9;    // connected to the base of the transistor
 
 void setup() {
   // set  the transistor pin as output:
   pinMode(transistorPin, OUTPUT);
 }
 
 void loop() {
   // read the potentiometer:
   int sensorValue = analogRead(A0);
   // map the sensor value to a range from 0 - 255:
   int outputValue = map(sensorValue, 0, 1023, 0, 255);
   // use that to control the transistor:
   analogWrite(transistorPin, outputValue);
 }

Lab 2 - Controlling a dc motor using an H-Bridge

const int switchPin = 2;    // switch input
const int motor1Pin = 3;    // Motor driver leg 1 (pin 3, AIN1)
const int motor2Pin = 4;    // Motor driver leg 2 (pin 4, AIN2)
const int pwmPin = 9;       // Motor driver PWM pin

void setup() {
    // set the switch as an input:
    pinMode(switchPin, INPUT_PULLUP); 
 
    // set all the other pins you're using as outputs:
    pinMode(motor1Pin, OUTPUT);
    pinMode(motor2Pin, OUTPUT);
    pinMode(pwmPin, OUTPUT);
 
    // set PWM enable pin high so that motor can turn on:
    digitalWrite(pwmPin, HIGH);
  }

void loop() {
    // if the switch is high, motor will turn on one direction:

    Serial.println(digitalRead(switchPin));
    if (digitalRead(switchPin) == HIGH) {
      digitalWrite(motor1Pin, LOW);   // set leg 1 of the motor driver low
      digitalWrite(motor2Pin, HIGH);  // set leg 2 of the motor driver high
    }
    // if the switch is low, motor will turn in the other direction:
    else {
      digitalWrite(motor1Pin, HIGH);  // set leg 1 of the motor driver high
      digitalWrite(motor2Pin, LOW);   // set leg 2 of the motor driver low
    }
}

Lab 3 - Controlling a stepper motor using an H-Bridge

const int transistorPin = 9;    // connected to the base of the transistor
 
 void setup() {
   // set  the transistor pin as output:
   pinMode(transistorPin, OUTPUT);
 }
 
 void loop() {
   // read the potentiometer:
   int sensorValue = analogRead(A0);
   Serial.println(sensorValue);
   // map the sensor value to a range from 0 - 255:
   int outputValue = map(sensorValue, 0, 1023, 0, 255);
   // use that to control the transistor:
   analogWrite(transistorPin, outputValue);
 }

Stepper Motor.mov