int vr_pin = A0;


void setup() {
  // put your setup code here, to run once:
pinMode(vr_pin, INPUT);
Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
int vr = analogRead(vr_pin);
int vr1 =map(vr,0,1023,0,255);
Serial.print("vr = ");
Serial.println(vr);
Serial.print("vr1 = ");
Serial.println(vr1);
delay(500);
}