#include "hcsr04ESP32.h" #define trigPin D3 #define echoPin D2 #define buzzer D4 UltraSonicDistanceSensor distanceSensor(trigPin, echoPin); void setup() { pinMode(buzzer, OUTPUT); } void loop() { float mesafe = distanceSensor.measureDistanceCm(); if(mesafe<20){ digitalWrite(buzzer, 1); delay(50); digitalWrite(buzzer, 0); } else if(mesafe<50){ digitalWrite(buzzer,1); delay(100); digitalWrite(buzzer,0); } else if (mesafe<80){ digitalWrite(buzzer,1); delay(150); digitalWrite(buzzer,0); } else{ digitalWrite(buzzer,0); } }