L298N Dual H Bridge DC & Stepper Motor Driver Module

Power

• VMS: Connect it to a 6V to 35V power supply w.r.t the voltage rating of the motor.
• GND: Connect it to the power supply ground. Make sure you tie all the GND ground pins together.
• 5V: 5V is the logic voltage pin. It gives 5V output when the internal LDO is enabled using the 5V-EN jumper. We recommend keep the jumper connected.

Signal

Connections for Arduino UNO

• ENA: Connect it to Pin ~9. Remove the jumper before connecting
• IN1: Connect it to Pin 8
• IN2: Connect it to Pin 7
• IN3: Connect it to Pin ~6
• IN4: Connect it to Pin ~5
• ENB: Connect it to Pin ~3. Remove the jumper before connecting

Code

/*
MOTORA    IN1   |   IN2   |   ENA
------------------------------------
Forward   HIGH  |   LOW   |   255
------------------------------------
Reverse   LOW   |   HIGH  |   255
------------------------------------
STOP      LOW   |   LOW   |   0
------------------------------------

MOTORB    IN3   |   IN4   |   ENB
------------------------------------
Forward   HIGH  |   LOW   |   255
------------------------------------
Reverse   LOW   |   HIGH  |   255
------------------------------------
STOP      LOW   |   LOW   |   0
------------------------------------
*/

// Motor A, Left Side  
const unit8_t ENA = 9
const unit8_t IN1 = 8
const unit8_t IN2 = 7
// Motor B, Right Side 
const unit8_t IN3 = 6
const unit8_t IN4 = 5
const unit8_t ENB = 3

void stop(){
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, LOW);
  analogWrite(ENA, 0);
  analogWrite(ENB, 0);
}

void moveForward(){
  digitalWrite(IN1, HIGH);
  digitalWrite(IN2, LOW);
  digitalWrite(IN3, HIGH);
  digitalWrite(IN4, LOW);    
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);
}

void moveReverse(){
  digitalWrite(IN1, LOW);
  digitalWrite(IN2, HIGH);
  digitalWrite(IN3, LOW);
  digitalWrite(IN4, HIGH);    
  analogWrite(ENA, 255);
  analogWrite(ENB, 255);
}

void increaseForward(){
  for (int i=0; i<256; i++){   
    digitalWrite(IN1, HIGH);
    digitalWrite(IN2, LOW);
    digitalWrite(IN3, HIGH);
    digitalWrite(IN4, LOW);    
    analogWrite(ENA, i);
    analogWrite(ENB, i);
    delay(20);      
  }
}

void setup() {
  pinMode(ENA, OUTPUT); //ENA Enable Pin
  pinMode(IN1, OUTPUT); //IN1
  pinMode(IN2, OUTPUT); //IN2
  pinMode(IN3, OUTPUT); //IN3
  pinMode(IN4, OUTPUT); //IN4
  pinMode(ENB, OUTPUT); //ENB Enable Pin
}

void loop(){
  stop(); // Stop DC Motors
  delay(3000);
  moveForward(); // Drive DC Motors Forward
  delay(3000);
  moveReverse(); // Drive DC Motors Reverse
  delay(3000);
  increaseForward(); // Drive DC Motors 0 to 100 Forward
  delay(3000);
}