05/29/2023

Distance Sensor HC-SR04 With Arduino

Writing about Distance Sensor HC-SR04 With Arduino for educational and informational purposes only. however, do not hesitate to use this information on your own risk as we make no warranty of any kind.

Connect distance sensor HC-SR04 with Arduino

const int trigPin = 7; // Trigger Pin
const int echoPin = 6; // Echo Pin
const long dist = 5; // This is the distance to turn on the LED
void setup() {
   pinMode(LED_BUILTIN, OUTPUT);
   pinMode(trigPin, OUTPUT);
   pinMode(echoPin, INPUT);
}

void loop() {
   long duration, distinches;
   
   digitalWrite(trigPin, LOW);
   delayMicroseconds(2);
   
   digitalWrite(trigPin, HIGH);
   delayMicroseconds(10);
   digitalWrite(trigPin, LOW);
   
   duration = pulseIn(echoPin, HIGH);
   distinches = duration / 74 / 2;

   if (distinches < dist) {
    digitalWrite(LED_BUILTIN, HIGH);  // turn the LED 
    delay(100);
   } else {
    digitalWrite(LED_BUILTIN, LOW);   // turn the LED off
    delay(100);
   }
    
}

This is for part 2, adding LEDs and a Timer

const int trigPin = 7; // Trigger Pin
const int echoPin = 6; // Echo Pin
const long dist = 5; // This is the distance to turn on the LED
int timer = 0;
void setup() {
   pinMode(13, OUTPUT);
   pinMode(12, OUTPUT);
   pinMode(11, OUTPUT);
   pinMode(10, OUTPUT);
   pinMode(trigPin, OUTPUT);
   pinMode(echoPin, INPUT);
}

void loop() {
   long duration, distinches;
   
   
   digitalWrite(trigPin, LOW);
   delayMicroseconds(2);
   
   digitalWrite(trigPin, HIGH);
   delayMicroseconds(10);
   digitalWrite(trigPin, LOW);
   
   duration = pulseIn(echoPin, HIGH);
   distinches = duration / 74 / 2;

   if (distinches < dist) {
    digitalWrite(13, HIGH); //Turn On Blue
    digitalWrite(12, LOW); //Turn Off Green
    
    if (timer > 5 && timer < 10) {
       digitalWrite(11, HIGH); //Turn On Yellow
       
    }  
    if (timer > 9) {
       digitalWrite(10, HIGH); //Turn On Red
    }
    
   } else {
    digitalWrite(13, LOW); //Turn Off Blue
    digitalWrite(12, HIGH); //Turn On Green
    digitalWrite(11, LOW); //Turn Off Yellow
    digitalWrite(10, LOW);  //Turn Off Red
    timer = 0; // Timer Reset
    
   }
   delay(1000);
   timer = timer + 1; //Timer +1 
    
}