Controlling DC motor with ultrasonic sensor

• dc motor

• arduino uno

• ultrasonic sensor

• jumper wire

• trig pin to digital pin 9

• echo pin to digital pin 10

• dc motor positive wire to digital pin 8

// defines pins numbers ultrasonic sensor.

const int trigPin = 9;

const int echoPin = 10;

// defines pins numbers motors.

const int motor = 8;

// defines variables

long duration;

int distance;

void setup() {

pinMode(trigPin, OUTPUT); // Sets the trigPin as an Output

pinMode(echoPin, INPUT); // Sets the echoPin as an Input

pinMode(motor, OUTPUT); // Sets the Motor as an Output

Serial.begin(9600); // Starts the serial communication

}

void loop() {

// Clears the trigPin

digitalWrite(trigPin, LOW);

delayMicroseconds(2);

// Sets the trigPin on HIGH state for 10 micro seconds

digitalWrite(trigPin, HIGH);

delayMicroseconds(10);

digitalWrite(trigPin, LOW);

// Reads the echoPin, returns the sound wave travel time in microseconds

duration = pulseIn(echoPin, HIGH);

// Calculating the distance

distance= duration*0.034/2;

// Prints the distance on the Serial Monitor

Serial.print("Distance: ");

Serial.println(distance);

if(distance < 10){

digitalWrite(motor, HIGH);

}else{

digitalWrite(motor, LOW);

}

}