PJ032: Play IR Module and Motor Driver Module with Arduino

Knowledge Check

• How do we reverse the DC motor spinning direction when using a simply battery pack?

• How do we speed up the DC motor spinning?

• What is H-Bridge, explain in your own way

• Why do we need a "Motor Driver Module", but not using the Arduino pin to direct let the motor spin?

• Challenging: Image a robot vehicle with 2 wheels, how do we make a rotation motion around a center point of the robot?

Reflect for findings and questions!

Take 1-2 minutes to explore anything on the tools and the making flow, with curiosity, no matter how much prior knowledge you have, you should make

• At least 1 interesting finding

• At least 1 curious question

BACKUP NOTES BELOW

// Control pins for Motor A

#define IN1 5

#define IN2 6

// Control pins for Motor B

#define IN3 10

#define IN4 11

// Input pins from IR modules

#define IR_FRONT 2

#define IR_REAR  3

int speed = 200;

void setup() {

  Serial.begin(115200);

  pinMode(IN1, OUTPUT);

  pinMode(IN2, OUTPUT);

  pinMode(IN3, OUTPUT);

  pinMode(IN4, OUTPUT);

  pinMode(IR_FRONT, INPUT);

  pinMode(IR_REAR, INPUT);

}

void loop() {

  // LOW signal input means detected light color surface!

  if (digitalRead(IR_FRONT) == LOW)

  {

    Serial.println("Front IR detected edge! Let's move back!");

    analogWrite(IN1, 0);

    analogWrite(IN2, speed);

    analogWrite(IN3, 0);

    analogWrite(IN4, speed);

  }

  Serial.println("It's fine, let's move forward!");

  analogWrite(IN1, speed);

  analogWrite(IN2, 0);

  analogWrite(IN3, speed);

  analogWrite(IN4, 0);

}