Arduino实现dht11传感器和mq2烟雾传感器以及火焰传感器控制led和蜂鸣器

以下是使用Arduino实现dht11传感器和mq2烟雾传感器以及火焰传感器控制led和蜂鸣器的代码示例：

#include <dht.h>

#define DHTPIN 2
#define DHTTYPE DHT11

dht DHT;

const int MQ2PIN = A0;
const int FLAMEPIN = A1;
const int LEDPIN = 9;
const int BUZZERPIN = 10;

void setup() {
  Serial.begin(9600);
  pinMode(LEDPIN, OUTPUT);
  pinMode(BUZZERPIN, OUTPUT);
}

void loop() {
  int chk = DHT.read11(DHTPIN);
  float temp = DHT.temperature;
  float hum = DHT.humidity;
  int smoke = analogRead(MQ2PIN);
  int flame = analogRead(FLAMEPIN);

  Serial.print("Temperature: ");
  Serial.print(temp);
  Serial.print("C, Humidity: ");
  Serial.print(hum);
  Serial.print("%, Smoke: ");
  Serial.print(smoke);
  Serial.print(", Flame: ");
  Serial.println(flame);

  if (temp > 25) {
    digitalWrite(LEDPIN, HIGH);
    digitalWrite(BUZZERPIN, HIGH);
    delay(500);
    digitalWrite(LEDPIN, LOW);
    digitalWrite(BUZZERPIN, LOW);
    delay(500);
  }

  if (smoke > 500) {
    digitalWrite(LEDPIN, HIGH);
    digitalWrite(BUZZERPIN, HIGH);
    delay(500);
    digitalWrite(LEDPIN, LOW);
    digitalWrite(BUZZERPIN, LOW);
    delay(500);
  }

  if (flame > 500) {
    digitalWrite(LEDPIN, HIGH);
    digitalWrite(BUZZERPIN, HIGH);
    delay(500);
    digitalWrite(LEDPIN, LOW);
    digitalWrite(BUZZERPIN, LOW);
    delay(500);
  }

  delay(2000);
}

该代码使用dht11传感器读取温度和湿度，使用mq2烟雾传感器和火焰传感器检测烟雾和火焰，如果温度、烟雾或火焰超过设定值，则LED和蜂鸣器会发出警报。你可以根据自己的需要更改传感器的引脚和阈值。