#include<Esp32Time.h>
#include<Wire.h>
#<Adafruit_GFX.h>
#<Adafruit_SSD1306.h>
Adafruit_SSD1306 Negin(128,64,& Wire,-1);
long duration;
int distance,Allowed;
int LED1=32;   //Red
int LED2=33;   //Green
int Volume=4;
const int trig=25;
const int echo=26;
void setup() {
  pinMode(trig,OUTPUT);
  pinMode(echo,INPUT);
  Serial.begin(115200);
  pinMode(LED,OUTPUT);
  Negin.begin(SSD1306_SWITCHCAPVCC,0X3C);
  Negin.setTestColor(WHITE);
  Negin.ColorDisplay();
}
void loop() {
  Negin.clearDisplay();
  Negin.SetTextsize(2);
  Allowed=analogRead(Volume);
  Allowed=map(Allowed,0,4095,0,298);
  Serial.println(Allowed);
  distance=c();
  Negin.setCursor(0,0);
  Negin.print("distance:");
  Negin.setCursor(10,0);
  Negin.print(distance);
  Negin.setCursor(0,1);
  Negin.print("Allowed(cm):");
  Negin.setCursor(13,1);
  Negin.print(Allowed);
  if(distance<Allowed){
    digitalWrite(LED1,HIGH);
    digitalWrite(LED2,LOW);
  }
  else{
    digitalWrite(LED1,LOW);
    digitalWrite(LED2,HIGH);
  }
  delay(500);
}
int c(){
  digitalWrite(trig,LOW);
  delayMicroseconds(2);
  digitalWrite(trig,HIGH);
  delayMicroseconds(10);
  digitalWrite(trig,LOW);
  duration=pulseIn(echo,HIGH);
  distance=duration*(0.034/2);
  return distance;
}