/*
  Activity 6: Temperature Sensor Control
  Purpose: Monitor temperature and change LED color based on threshold
  Green LED = Normal temperature
  Red LED = Temperature exceeds threshold
  Uses LM35 analog temperature sensor
  
  Components:
  - ESP32 Dev Module
  - LM35 temperature sensor connected to GPIO 34
  - Green LED connected to GPIO 19
  - Red LED connected to GPIO 18
*/

#define PIN_LM35 34
#define LED_VERDE 19
#define LED_ROJO 18

float temperatura = 0;
// Change this value according to your project requirements
float temperaturaAlta = 14.0;

void setup() {
  Serial.begin(115200);
  pinMode(LED_VERDE, OUTPUT);
  pinMode(LED_ROJO, OUTPUT);
  digitalWrite(LED_VERDE, LOW);
  digitalWrite(LED_ROJO, LOW);
}

void loop() {
  int lecturaADC = analogRead(PIN_LM35);
  // ESP32 ADC: 0 to 4095
  // Reference voltage: 3.3V
  float voltaje = lecturaADC * (3.3 / 4095.0);
  // LM35 delivers 10mV per degree Celsius
  // 0.01V = 1°C
  temperatura = voltaje * 100.0;
  
  Serial.print("ADC: ");
  Serial.print(lecturaADC);
  Serial.print(" | Voltage: ");
  Serial.print(voltaje);
  Serial.print(" V | Temperature: ");
  Serial.print(temperatura);
  Serial.println(" °C");
  
  if (temperatura >= temperaturaAlta) {
    digitalWrite(LED_ROJO, HIGH);
    digitalWrite(LED_VERDE, LOW);
  } else {
    digitalWrite(LED_ROJO, LOW);
    digitalWrite(LED_VERDE, HIGH);
  }
  delay(500);
}