beginnerMicrocontrollers
Simple Project With the Ultrasonic Sensor (HC-SR04) +LED -Arduino Tutoriel-
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1 hour
$5-10
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Original Project by SaidiDikra from Instructables.
License: Attribution-NonCommercial-ShareAlike
Ultrasonic ranging module HC - SR04 provides 2cm - 400cm non-contact measurement function, the ranging accuracy can reach to 3mm. The modules includes ultrasonic transmitters, receiver and control circuit.
This is a simple example of using the ultrasonic sensor (HC-SR04) in Arduino where we will turn on a led with the variation of distance and print the distance from an object to the serial monitor.
Steps
1
All the Necessary Components
All the Necessary Components
1. Arduino Uno
2. Ultrasonic Sensor (HC-SR04).
3. Mini-BreadBoard
4. 1 kohm Resistor.
5. Jumpers.
6. Blue LED.
2
Connect the Components
Connect the Components
Connect the Components
The connection of the components is very easy it is only necessary to follow the following pictures.
3
Write Your Code
#define trigPin 13
#define echoPin 12
#define led 11
void setup()
{ Serial.begin (9600);
pinMode(trigPin, OUTPUT);
pinMode(echoPin, INPUT);
pinMode(led, OUTPUT);
}
void loop()
{ long duration, distance;
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
duration = pulseIn(echoPin, HIGH);
distance = (duration/2) / 29.1;
if (distance < 10)
{ digitalWrite(led,HIGH);
}
else {
digitalWrite(led,LOW);
}
Serial.print(distance);
Serial.println(" cm");
delay(500);
}
Conclusion
You can change the value of distance by replacing 10 in the condition if (distance <=10) by the desired value.
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