Special ‘Arduino Motor’ shield is designed to operate motors.

2015-11-13-17-17-49

2015-11-13-17-19-54

Depending on the speed of each motor, the projection would change its shape. The speed of the motors is controlled by a sensor – SR04 Ultrasonic sensor – or analog switches.

Code example for Arduino is provided below.

int val1 = 0; // value from the sensor for motor A

int val2 = 0; //value from the sensor for motor B

#include <NewPing.h>

#define TRIGGER_PIN 7 // Arduino pin tied to trigger pin on the ultrasonic sensor.

#define ECHO_PIN 10 // Arduino pin tied to echo pin on the ultrasonic sensor.

#define MAX_DISTANCE 200 // Maximum distance we want to ping for (in centimeters). Maximum sensor distance is rated at 400-500cm.

NewPing sonar(TRIGGER_PIN, ECHO_PIN, MAX_DISTANCE);

void setup() {

Serial.begin(9600);

}

void loop(){ 

//defining sensor values for the motors

val1 = sonar.ping_cm();

val2 = sonar.ping_cm(); //mapping sensor values to motor speed

val1 = map(val1, 0, 100, 100, 200);

val2 = map(val2, 0, 100, 0, 255);

//Motor A

digitalWrite(12, HIGH); //Establishes forward direction

digitalWrite(9, LOW); //Disengage the Brake

analogWrite(3, val1); //Spins the motor at full speed

//Motor B

digitalWrite(13, HIGH); //Establishes backward direction

digitalWrite(8, LOW); //Disengage the Brake for Channel B

analogWrite(11, val2); //Spins the motor at half speed

delay(50); // Wait 50ms between pings  Serial.print("Ping: ");

Serial.print(sonar.ping_cm()); // Send ping, get distance in cm and print result (0 = outside set distance range)

Serial.println("cm");

Serial.println(val1);

Serial.println(val2);

}