void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
pinMode(5, OUTPUT);//led
pinMode(34, INPUT);//meter
}

void loop() {
  int v=analogRead(34);
  Serial.println("volt:"+String(v));
  int intensity=map(v,0,4095,0,255);
  Serial.println("intensity:"+String(intensity));
  analogWrite(5,intensity);
  if(intensity>130)
  {
    digitalWrite(5, HIGH);
    Serial.println("high voltage");
      }
      else{
        digitalWrite(5, LOW);
        Serial.println("low voltage");
        delay(1000);
      }
  }