#define trigpin 14
#define echopin 12

int ledpin =16;
int relaypin = 2;
int buzzerpin  = 4;



void setup() {
pinMode(trigpin, OUTPUT);
pinMode(echopin, INPUT);
pinMode(ledpin, OUTPUT);
pinMode(2, OUTPUT);
pinMode(4, OUTPUT);
Serial.begin(115200);
}

void loop() {
digitalWrite(14,0);
delayMicroseconds(2);

digitalWrite(14, 1);
delayMicroseconds(10);
digitalWrite(trigpin,0);


long duration = pulseIn(12,1);
int distance =  (duration/2)*0.0343;

Serial.println(distance);

if(distance<100){
digitalWrite(ledpin, HIGH);
digitalWrite(4,1);
digitalWrite(2,1);
}else{
  digitalWrite(ledpin, LOW);
digitalWrite(4,0);
digitalWrite(2,0);
}
delay(500);




}