Cảm biến khí ga MQ-5

// Cam bien MQ-5 - Arduino Uno, xem ket qua o Serial Monitor 9600 baud
#define AO_PIN A0      // Chan analog
#define DO_PIN 2       // Chan so (nguong chinh bang bien tro tren module)
#define LED_PIN LED_BUILTIN

void setup() {
  Serial.begin(9600);
  pinMode(DO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  Serial.println("Cam bien MQ-5 - MShop");
  Serial.println("Dang lam nong cam bien 20 giay...");
  delay(20000UL);
}

void loop() {
  int ao = analogRead(AO_PIN);
  int phanTram = map(ao, 0, 1023, 0, 100);
  bool d = digitalRead(DO_PIN);
  digitalWrite(LED_PIN, d == LOW);   // LED tren board sang khi DO = LOW
  Serial.print("Analog: "); Serial.print(ao);
  Serial.print(" ("); Serial.print(phanTram); Serial.print("%)");
  Serial.print("  |  DO: ");
  Serial.print(d == LOW ? "LOW - VUOT NGUONG - canh bao!" : "HIGH - Binh thuong");
  Serial.println();
  delay(500);
}

// Cam bien MQ-5 - ESP32, xem ket qua o Serial Monitor 115200 baud
#define AO_PIN 34      // Chan analog
#define DO_PIN 27       // Chan so (nguong chinh bang bien tro tren module)
#define LED_PIN 2

void setup() {
  Serial.begin(115200);
  pinMode(DO_PIN, INPUT);
  pinMode(LED_PIN, OUTPUT);
  Serial.println("Cam bien MQ-5 - MShop");
  Serial.println("Dang lam nong cam bien 20 giay...");
  delay(20000UL);
}

void loop() {
  int ao = analogRead(AO_PIN);
  int phanTram = map(ao, 0, 4095, 0, 100);
  bool d = digitalRead(DO_PIN);
  digitalWrite(LED_PIN, d == LOW);   // LED tren board sang khi DO = LOW
  Serial.print("Analog: "); Serial.print(ao);
  Serial.print(" ("); Serial.print(phanTram); Serial.print("%)");
  Serial.print("  |  DO: ");
  Serial.print(d == LOW ? "LOW - VUOT NGUONG - canh bao!" : "HIGH - Binh thuong");
  Serial.println();
  delay(500);
}