#define pot 36 // ESP32 pin GIOP36 (ADC0)
int LED = 26;

void setup() {
  // initialize serial communication at 9600 bits per second:
  Serial.begin(115200);
 pinMode(LED, OUTPUT);
}

void loop() {
  // reads the input on analog pin (value between 0 and 4095)
  int analogValue = analogRead(pot);
float z1=analogValue;
  Serial.print("Discrete Value = ");
  Serial.println(analogValue);   // the raw analog reading
  float z2=z1*5/4095;
Serial.print("Analog Value  = ");
  Serial.println(z2);   //
  // We'll have a few threshholds, qualitatively determined
  if (z2 > 3.5) {
    Serial.println(" Voltage abnormal");
     digitalWrite(LED, HIGH);
    } 
    else 
    {
    Serial.println("Voltage Normal");
    digitalWrite(LED, LOW);
  }

  delay(500);
}