Je Veux Cr Er Un Objet Qui Absorbe

#include <Arduino.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <MHZ19.h>
#include <HardwareSerial.h>

// Pin definitions
#define CO2_RX_PIN   16   // ESP32 RX2 ← MH-Z19B TX
#define CO2_TX_PIN   17   // ESP32 TX2 → MH-Z19B RX
#define RELAY_PIN    26   // Relay IN (LOW = fan ON)
#define LED_R_PIN    25
#define LED_G_PIN    27
#define LED_B_PIN    14

// Thresholds (ppm)
#define CO2_GOOD     800
#define CO2_WARN    1200
#define CO2_BAD     1600

// OLED
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET   -1

// Forward declarations
void setLED(uint8_t r, uint8_t g, uint8_t b);
void updateDisplay(int co2ppm, bool fan);

Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

// CO2 sensor
HardwareSerial co2Serial(2);
MHZ19 mhz19;

// State
int  lastCO2     = -1;
bool fanOn       = false;
unsigned long lastRead = 0;
const unsigned long READ_INTERVAL = 5000; // ms

void setLED(uint8_t r, uint8_t g, uint8_t b) {
  analogWrite(LED_R_PIN, r);
  analogWrite(LED_G_PIN, g);
  analogWrite(LED_B_PIN, b);
}

void updateDisplay(int co2ppm, bool fan) {
  display.clearDisplay();
  display.setTextColor(SSD1306_WHITE);

  // Title
  display.setTextSize(1);
  display.setCursor(0, 0);
  display.print("CO2 Capture System");
  display.drawLine(0, 10, 127, 10, SSD1306_WHITE);

  // CO2 value
  display.setTextSize(2);
  display.setCursor(0, 16);
  if (co2ppm > 0) {
    display.print(co2ppm);
    display.setTextSize(1);
    display.print(" ppm");
  } else {
    display.print("Warmup...");
  }

  // Status
  display.setTextSize(1);
  display.setCursor(0, 40);
  if (co2ppm <= 0)        display.print("Status: WARMING UP");
  else if (co2ppm < CO2_GOOD)  display.print("Status: GOOD  ");
  else if (co2ppm < CO2_WARN)  display.print("Status: MODERATE");
  else if (co2ppm < CO2_BAD)   display.print("Status: HIGH   ");
  else                         display.print("Status: DANGER !");

  // Fan
  display.setCursor(0, 52);
  display.print("Fan: ");
  display.print(fan ? "ON  (capturing)" : "OFF");

  display.display();
}

void setup() {
  Serial.begin(115200);

  // LED pins
  pinMode(LED_R_PIN, OUTPUT);
  pinMode(LED_G_PIN, OUTPUT);
  pinMode(LED_B_PIN, OUTPUT);

  // Relay
  pinMode(RELAY_PIN, OUTPUT);
  digitalWrite(RELAY_PIN, HIGH); // relay inactive (active LOW module)

  // OLED
  if (!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) {
    Serial.println("SSD1306 not found");
  }
  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10, 20);
  display.print("CO2 Capture System");
  display.setCursor(20, 36);
  display.print("Warming up 3 min");
  display.display();

  // CO2 sensor on UART2
  co2Serial.begin(9600, SERIAL_8N1, CO2_RX_PIN, CO2_TX_PIN);
  mhz19.begin(co2Serial);
  mhz19.autoCalibration(false);

  setLED(0, 0, 30); // dim blue during warmup
  Serial.println("MH-Z19B warming up (3 minutes needed)...");
}

void loop() {
  unsigned long now = millis();

  if (now - lastRead >= READ_INTERVAL) {
    lastRead = now;
    int co2 = mhz19.getCO2();

    if (co2 > 0) {
      // Fan logic
      bool shouldFanOn = (co2 >= CO2_WARN);
      if (shouldFanOn != fanOn) {
        fanOn = shouldFanOn;
        digitalWrite(RELAY_PIN, fanOn ? LOW : HIGH);
      }

      // LED color
      if (co2 < CO2_GOOD)       setLED(0, 255, 0);    // green
      else if (co2 < CO2_WARN)  setLED(255, 165, 0);  // orange
      else if (co2 < CO2_BAD)   setLED(255, 50, 0);   // red-orange
      else                      setLED(255, 0, 0);     // red

      if (co2 != lastCO2) {
        lastCO2 = co2;
        updateDisplay(co2, fanOn);
        Serial.printf("CO2: %d ppm  Fan: %s\n", co2, fanOn ? "ON" : "OFF");
      }
    } else {
      // Still warming up
      updateDisplay(-1, false);
    }
  }
}