void setup(){
Serial.begin(115200);
Serial.println("hello,ESP32");
pinMode(18, OUTPUT);
pinMode(23, OUTPUT);
}

void loop()
{
  int adcRes = analogRead(A5);
  Serial.print("The digital value ");  // digital value ranges from 0-4095
  Serial.println(adcRes);
  delay(500);

  float voltage = adcRes * 3.3/4095;
  Serial.print("The voltage value ");  
  Serial.println(voltage);

if (adcRes <= 1000)
{
  digitalWrite(18, LOW);
  digitalWrite(23, HIGH);
}
if (adcRes >= 1000 && adcRes <= 3500)
{
  digitalWrite(23,LOW);
  digitalWrite(18, HIGH);
}
if (adcRes >= 3500)
{
 digitalWrite(18, LOW);
 digitalWrite(23,LOW);
}
  }