#define LEDR 23 // yellow LED
#define LEDG 18 // green LED
#define ADC_IN A5
#define ADC_REF 3.3

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(LEDR,OUTPUT);
  pinMode(LEDG,OUTPUT);
}

void loop() {
  int adcRes=analogRead(ADC_IN);
  // put your main code here, to run repeatedly:
  delay(500); // this speeds up the simulation
  float voltage = (float) adcRes*ADC_REF/4095;
  Serial.println(adcRes); // display the reading in 1 decimal place

  // adcRes is the ... value while voltage is the raw value
  if(adcRes<=1000) // less than 1000, green will turn ON
  {
    digitalWrite(LEDR,HIGH); // have to switch off the other LED or else it remains on if we don't instruct it
    digitalWrite(LEDG,LOW);
  }
  if (adcRes>1000 && adcRes<3500) // between 1000 and 3500, red will turn ON
  {
    digitalWrite(LEDR,LOW);
    digitalWrite(LEDG,HIGH);
  }
  else if(adcRes>=3500) // above 3500, both LEDs will turn on
  {
    digitalWrite(LEDG,LOW);
    digitalWrite(LEDR,LOW);
  }
}