Multiple Ultrasonic Sensor Arduino with code

Hi, In this post I'm going to show you how you can control 3 leds with 3 ultrasonic sensors at once in Arduino. I was actually looking for this sketch all over the internet and I couldn't find how I wanted. 

Finally I found someone who was looking for similar sketch but he was looking for a sketch that control servo motor and the sketch was not working for him. So I thought let me modify this sketch and try for my own project, then I modified it and it started working. 

The sketch1 is below:

int ledPin = 52; int ledPin2 = 53; int ledPin3 = 40; int trigPin = 50; int echoPin = 51; int trigPin2 = 48; int echoPin2 = 49; int trigPin3 = 30; int echoPin3 = 31; void setup() {   Serial.begin (9600);   pinMode(trigPin, OUTPUT);   pinMode(echoPin, INPUT);   pinMode(trigPin2, OUTPUT);   pinMode(echoPin2, INPUT);   pinMode(trigPin3, OUTPUT);   pinMode(echoPin3, INPUT);   pinMode(ledPin, OUTPUT);   pinMode(ledPin2, OUTPUT);   pinMode(ledPin3, OUTPUT); } void loop() {   int duration, distance;   digitalWrite (trigPin, HIGH);   delayMicroseconds (10);   digitalWrite (trigPin, LOW);   duration = pulseIn (echoPin, HIGH);   distance = (duration/2) / 29.1;       Serial.print(distance);         Serial.print("cm");       Serial.println();   if (distance < 30) {  // Change the number for long or short distances.     digitalWrite (ledPin, HIGH);   } else {     digitalWrite (ledPin, LOW);   }     int duration2, distance2;     digitalWrite (trigPin2, HIGH);     delayMicroseconds (10);     digitalWrite (trigPin2, LOW);     duration = pulseIn (echoPin2, HIGH);     distance2 = (duration/2) / 29.1;           Serial.print(distance2);         Serial.print("cm");       Serial.println();         if (distance2 < 20) {  // Change the number for long or short distances.       digitalWrite (ledPin2, HIGH);     }  else {       digitalWrite (ledPin2, LOW);     }     int duration3, distance3;     digitalWrite (trigPin3, HIGH);     delayMicroseconds (10);     digitalWrite (trigPin3, LOW);     duration = pulseIn (echoPin3, HIGH);     distance3 = (duration/2) / 29.1;           Serial.print(distance3);         Serial.print("cm");       Serial.println();         if (distance3 < 10) {  // Change the number for long or short distances.       digitalWrite (ledPin3, HIGH);     }  else {       digitalWrite (ledPin3, LOW);     }   } // Code ends here.

 Note: The pin numbers you see here are way to high you might think. Well, that's because I've used Arduino Mega in this project and it has way too many pins.

Allocating pins: int ledPin = 52; // This pin is for first led. int ledPin2 = 53; // This pin is for second led. int ledPin3 = 40; // This pin is for third led. int trigPin = 50; // Trigger Pin of first sensor. int echoPin = 51; // Echo Pin of first sensor. int trigPin2 = 48; // Trigger Pin of second sensor. int echoPin2 = 49; // EchoPin of second sensor. int trigPin3 = 30; // Trigger Pin of third sensort. int echoPin3 = 31; // Echo Pin of third sensor. You can change the pins to which ever you may like, but please keep in mind which pin you are allocating to what.

The green highlighted arrow < means that if any object is less than what number you put after the arrow, then the led will turn on. You can make it opposite as well just by putting >. And that will mean, any number you put after the arrow the led will turn on at.

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Special thanks for visiting this page! :)

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Diagram of Ultrasonic Sensors and LEDs. Remember to add resistors to leds to limit the current flow.

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Sketch2

int ledPin1 = 3; int ledPin2 = 4; int ledPin3 = 5; int trigPin1 = 6; int echoPin1 = 7; int trigPin2 = 8; int echoPin2 = 9; int trigPin3 = 10; int echoPin3 = 11; void setup() {   Serial.begin (9600);   pinMode(trigPin1, OUTPUT);   pinMode(echoPin1, INPUT);     pinMode(trigPin2, OUTPUT);   pinMode(echoPin2, INPUT);     pinMode(trigPin3, OUTPUT);   pinMode(echoPin3, INPUT);     pinMode(ledPin1, OUTPUT);   pinMode(ledPin2, OUTPUT);   pinMode(ledPin3, OUTPUT); } void firstsensor(){ // This function is for first sensor.   int duration1, distance1;   digitalWrite (trigPin1, HIGH);   delayMicroseconds (10);   digitalWrite (trigPin1, LOW);   duration1 = pulseIn (echoPin1, HIGH);   distance1 = (duration1/2) / 29.1;       Serial.print("1st Sensor: ");       Serial.print(distance1);        Serial.print("cm    ");   if (distance1 < 30) {  // Change the number for long or short distances.     digitalWrite (ledPin1, HIGH);   } else {     digitalWrite (ledPin1, LOW);   }    } void secondsensor(){ // This function is for second sensor.     int duration2, distance2;     digitalWrite (trigPin2, HIGH);     delayMicroseconds (10);     digitalWrite (trigPin2, LOW);     duration2 = pulseIn (echoPin2, HIGH);     distance2 = (duration2/2) / 29.1;         Serial.print("2nd Sensor: ");       Serial.print(distance2);        Serial.print("cm    ");        if (distance2 < 20) {  // Change the number for long or short distances.       digitalWrite (ledPin2, HIGH);     }  else {       digitalWrite (ledPin2, LOW);     }    } void thirdsensor(){ // This function is for third sensor.     int duration3, distance3;     digitalWrite (trigPin3, HIGH);     delayMicroseconds (10);     digitalWrite (trigPin3, LOW);     duration3 = pulseIn (echoPin3, HIGH);     distance3 = (duration3/2) / 29.1;       Serial.print("3rd Sensor: ");         Serial.print(distance3);        Serial.print("cm");        if (distance3 < 10) {  // Change the number for long or short distances.       digitalWrite (ledPin3, HIGH);     }  else {       digitalWrite (ledPin3, LOW);     }   } void loop() { Serial.println("\n"); firstsensor(); secondsensor(); thirdsensor(); delay(100); }

Note:
The sketch2 has been updated later. Even though the sketch1 works but to make it more easier I've written the sketch2 and tested it properly and I'm very happy with its result. It prints the distances and controls the leds very fast without any problem. I hope it helps you :) Best wishes for your project!

You might be also interested in:
How to make Master and Slave ultrasonic sensors

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