const int TRIG_PIN = 12;
const int ECHO_PIN = 27;
int led1=33;
int led2=25;
int led3=32;
long duration, distance;
void setup() {
Serial.begin(115200);
pinMode(led1, OUTPUT);
pinMode(led2, OUTPUT);
pinMode(led3, OUTPUT);
pinMode(TRIG_PIN, OUTPUT);
pinMode(ECHO_PIN, INPUT);
}
void loop() {
distance = getDistanceInCentimeters();
Serial.println("Distance = "+ String(distance));
delay(1000);
if(distance>=100 && distance<=200)
{
digitalWrite(led1, HIGH);
digitalWrite(led2, LOW);
digitalWrite(led3, LOW);
}
else if(distance>=200 && distance<=300)
{
digitalWrite(led1, HIGH);
digitalWrite(led2, HIGH);
digitalWrite(led3, LOW);
}
else if(distance>=300)
{
digitalWrite(led1, HIGH);
digitalWrite(led2, HIGH);
digitalWrite(led3, HIGH);
}
}
long getDistanceInCentimeters() {
digitalWrite(TRIG_PIN,LOW);
delayMicroseconds(2);
digitalWrite(TRIG_PIN, HIGH);
delayMicroseconds(10);
digitalWrite(TRIG_PIN, LOW);
duration = pulseIn(ECHO_PIN, HIGH);
return (duration * 0.034 / 2) + 1;
}