#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
const int mq135Pin = 34;
const int ledPin = 25;
float voltage = 0;
int sensorValue = 0;
float airQuality = 0;
void setup() {
Serial.begin(115200);
pinMode(ledPin, OUTPUT);
Wire.begin(21, 22);
if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
Serial.println("OLED no encontrada");
while(true);
}
display.clearDisplay();
display.setTextSize(1);
display.setTextColor(WHITE);
}
void loop() {
sensorValue = analogRead(mq135Pin);
voltage = sensorValue * (3.3 / 4095.0);
airQuality = map(sensorValue, 0, 4095, 0, 500);
// 🚨 Control del LED
if (airQuality > 150) {
digitalWrite(ledPin, HIGH); // Enciende alerta
} else {
digitalWrite(ledPin, LOW); // Apaga alerta
}
Serial.print("Sensor: ");
Serial.print(sensorValue);
Serial.print(" AQI: ");
Serial.println(airQuality);
display.clearDisplay();
display.setCursor(0, 10);
display.println("Calidad Aire");
display.setCursor(0, 30);
display.print("Valor: ");
display.println(sensorValue);
display.setCursor(0, 45);
display.print("AQI: ");
display.println(airQuality);
display.display();
delay(2000);
}