L239D -Individual research Tanmay

L239D MOTOR DRIVE

What is an L239D motor drive?

L293D is a 16-pin motor driver IC consist of quadruple half H drivers. It can simultaneously control the direction and speed of two DC motors.

Where is it used?

L293d could be used to control the two motors at the same time.
It has the ability to control the speed by using the enable pin.
The direction is also easy to change.
Voltage supply range is higher than other IC. Voltage range between 4.5-36 volts can easily handle by the IC to the motor.
The motor has a maximum continuous range of current close to 600mA but the maximum peak current range is 1.2A
It has an automatic shutdown system on thermal condition.
Its working range is from 0 – 70 degree which is much higher for any small-sized IC.
It has an internal back emp protection for IC and the controlling device.

CODE

// Motor A connections
int enA = 9;
int in1 = 8;
int in2 = 7;
// Motor B connections
int enB = 3;
int in3 = 5;
int in4 = 4;

void setup() {
      // Set all the motor control pins to outputs
      pinMode(enA, OUTPUT);
      pinMode(enB, OUTPUT);
      pinMode(in1, OUTPUT);
      pinMode(in2, OUTPUT);
      pinMode(in3, OUTPUT);
      pinMode(in4, OUTPUT);

      // Turn off motors – Initial state
      digitalWrite(in1, LOW);
      digitalWrite(in2, LOW);
      digitalWrite(in3, LOW);
      digitalWrite(in4, LOW);
}

void loop() {
      directionControl();
      delay(500);
      speedControl();
      delay(200);
}

// This function lets you control spinning direction of motors
void directionControl() {
      // Set motors to maximum speed
      // For PWM maximum possible values are 0 to 255
      analogWrite(enA, 200);
      analogWrite(enB, 255);

      // Turn on motor A & B
      digitalWrite(in1, HIGH);
      digitalWrite(in2, LOW);
      digitalWrite(in3, HIGH);
      digitalWrite(in4, LOW);
      delay(500);

      // Now change motor directions
      digitalWrite(in1, LOW);
      digitalWrite(in2, HIGH);
      digitalWrite(in3, LOW);
      digitalWrite(in4, HIGH);
      delay(500);

      // Turn off motors
      digitalWrite(in1, LOW);
      digitalWrite(in2, LOW);
      digitalWrite(in3, LOW);
      digitalWrite(in4, LOW);
}

// This function lets you control speed of the motors
void speedControl() {
      // Turn on motors
      digitalWrite(in1, LOW);
      digitalWrite(in2, HIGH);
      digitalWrite(in3, LOW);
      digitalWrite(in4, HIGH);

      // Accelerate from zero to maximum speed
      for (int i = 0; i < 256; i++) {
           analogWrite(enA, i);
           analogWrite(enB, i);
           delay(20);
      }

      // Decelerate from maximum speed to zero
      for (int i = 255; i >= 0; –i) {
           analogWrite(enA, i);
           analogWrite(enB, i);
           delay(20);
      }

      // Now turn off motors
      digitalWrite(in1, LOW);
      digitalWrite(in2, LOW);
      digitalWrite(in3, LOW);
      digitalWrite(in4, LOW);
}