#include"BluetoothSerial.h"
const int led=21;
const int potpin=35;
BluetoothSerial serialBT;
void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  serialBT.begin("esp1");
  Serial.println("the bluetooth device is ready to pair");
  pinMode(led, OUTPUT);
  pinMode(potpin, INPUT);

}

void loop() {
   if (Serial.available()){
    int potvalue=analogRead(potpin);
    int ledValue=map(potvalue,0,4095, 0,255);
    digitalWrite(led , ledValue);
   }
}