Obstacle Detection System Using Arduino and Ultrasonic Sensor || techtalksgroup ||

Things used in the project:

1. Test Board

2. Ultrasonic sensor

3. Arduino cable

4. +5V buzzer

5. Male to male pins

6. Arduino uno board

Connect the Components as shown in the circuit:

Connect the Buzzer positive terminal to the Arduino pin 2 and the negative terminal to the Gnd. Connect the VCC pin of ultrasonic to +5v pin and the Gnd to the ground.

Connect trig pin to pin 10 and echo pin to pin 9.

Upload the code in the Arduino:

// Define pins for ultrasonic and buzzer
int const trigPin = 10;
int const echoPin = 9;
int const buzzPin = 2;
void setup()
{
pinMode(trigPin, OUTPUT); // trig pin will have pulses output
pinMode(echoPin, INPUT); // echo pin should be input to get pulse width
pinMode(buzzPin, OUTPUT); // buzz pin is output to control buzzering
}
void loop()
{
// Duration will be the input pulse width and distance will be the distance to the obstacle in centimeters
int duration, distance;
// Output pulse with 1ms width on trigPin
digitalWrite(trigPin, HIGH);
delay(1);
digitalWrite(trigPin, LOW);
// Measure the pulse input in echo pin
duration = pulseIn(echoPin, HIGH);
// Distance is half the duration devided by 29.1 (from datasheet)
distance = (duration/2) / 29.1;
// if distance less than 0.5 meter and more than 0 (0 or less means over range)
    if (distance <= 50 && distance >= 0) {
    // Buzz
    digitalWrite(buzzPin, HIGH);
    } else {
    // Don't buzz
    digitalWrite(buzzPin, LOW);
    }
    // Waiting 60 ms won't hurt any one
    delay(60);
}

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