Arduino UNO R3开发板+MQ-2烟雾浓度传感器+火焰传感器+舵机+无源蜂鸣器+风扇+步进电机+WIFI模块+RGB三色LED灯+SIM900A所构成的室内安全报警模块

该系统模块主要由Arduino UNO R3开发板+MQ-2烟雾浓度传感器+火焰传感器+舵机+无源蜂鸣器+风扇+步进电机+WIFI模块+RGB三色LED灯+SIM900A所组成，MQ-2烟雾浓度传感器达到不同的阈值的时候，LED灯会通过不同的颜色来进行警示。烟雾浓度增大，LED灯依次显示绿、蓝、红，且步进电机会驱动风扇进行不同挡位转速旋转，蜂鸣器会进行警报提示。烟雾浓度超过最大的阈值，或者检测到有火焰产生，红灯亮起，蜂鸣器鸣响，步进电机以最大的转速驱动风扇旋转，SIM900A会给指定用户拨打电话。
因为该模块有WiFi模块，也可以通过连接WiFi通过APP进行控制步进电机的转速驱动，也可以实现手动的控制风扇转速。

一、设备准备

Arduino UNO R3Arduino UNO R3开发板+MQ-2烟雾浓度传感器+舵机+无源蜂鸣器+风扇+步进电机+WIFI模块+RGB三色LED灯+SIM900A所构成。MQ-2烟雾浓度传感器实时检测室内烟雾浓度数值，若超过阈值，风扇进行转动

WIFI模块

MQ-2烟雾浓度传感器

火焰传感器模块

舵机

无源蜂鸣器

风扇

RGB三色LED灯

步进电机

SIM900A

二、设备连接

烟雾浓度传感器

烟雾浓度传感器	Arduino UNO R3
VCC	5V
GND	GND
DO	P7
AO	A0

火焰传感器

火焰传感器	Arduino UNO R3
DO	P2
GND	GND
VCC	5V

无源蜂鸣器

无源蜂鸣器	Arduino UNO R3
GND	GND
I/O	P8
VCC	5V

三色LED灯

三色LED灯	Arduino UNO R3
R	P11
G	P12
B	P13
GND	GND

步进电机

步进电机	Arduino UNO R3
IN3	P9
IN4	P4
+	5V
-	GND

风扇

风扇	步进电机
红线	B灯处
黑线	C灯处

WIFI模块(局域模式)

WIFI模块	Arduino UNO R3
RX	TX
TX	RX
GND	GND
5V	5V

SIM900A模块

SIM900A	Arduino UNO R3
5VR	TX
5VT	RX
GND	GND
VCC5	5V
GND	GND

舵机模块

舵机	Arduino UNO R3
黄线	P6
灰线	GND
红线	5V

三、配置网络

将代码下载到Arduino UNO R3开发板上
WIFI模块需要调节到局域模式，此时打开手机wifi热点，即可检测到WiFi模块所组成的网络，，进行连接。
APP下载路径，打开下载安装好的手机APP

之后，点击右上角的连接
连接成功之后，即可点击 开锁(49)、加速、减速、蜂鸣器开(50)、蜂鸣器关(51)、一档、二档、三档 可以对舵机、蜂鸣器以及风扇进行控制。

四、完整代码

/******************************************************
 * connection:
 * MQ-2 gas sensor            Uno R3
 * D0                            7
 * A0                            A0
 * GND                           GND
 * VCC                            5V
 * 
 * 
 * Dual-color LED    Arduin Uno R3
 * R                  11
 * G                  12
 * B                  13
 * GND                GND
 * 
 * 
 * buzzerPin                      8
 * GND                           GND
 * VCC                            5V
 * 
 * 
 * motorIn1 = 9;
 * motorIn2 = 10;
 * 
 *******************************************************/
#include <Servo.h>  //Arduino IDE自带的舵机库文件
const int Servo_Pin = 6;      //模拟开门
Servo myservo;      //定义舵机对象myservo

const int digitalInPin = 2; //D0 attach to digital 2

const int analogPin=A0; //the DO on the Module attach to Pin7 on the SunFounder 
const int digitalPin=7;  //the D0 attach to pin7
int Astate=0;
boolean  Dstate=0;

int redPin = 11;    // select the pin for the red LED
int greenPin = 12; 
int bluePin = 13; 

int buzzerPin = 8;//the pin of the active buzzer attach to pin8
int comdata;
const int motorIn1 = 9;
const int motorIn2 = 4;
#define rank1 150
#define rank2 200
#define rank3 250

void set_tele(void)
{
    
    
    Serial.begin(115200);                  //波特率为115200
    delay(1000);
    Serial.println("AT\r\n");                  //判断模块是否正常
    delay(1000);
}
void tele(void)
{
    
    
    Serial.println("AT+CPIN?\r\n");         
    delay(1000);
    Serial.println("AT+CSQ\r\n");              
    delay(3000);
    Serial.print("AT+CREG?\r\n");          
    delay(3000);
    Serial.println("AT+CGATT?\r\n");  
    delay(1000);
    Serial.println("ATD15336551683;\r\n");      
    delay(30000);
}


void setup() 
{
    
    
  pinMode(digitalInPin,INPUT);
  
  //set the pins state 
  pinMode (digitalPin,INPUT);

  pinMode(redPin, OUTPUT); //set redPin as OUTPUT
  pinMode(greenPin, OUTPUT);
  pinMode(bluePin, OUTPUT);
  
  pinMode(buzzerPin,OUTPUT);//set the buzzer as as OUTPUT
  digitalWrite(buzzerPin,LOW);//initialize the buzzerPin as LOW level

  pinMode(motorIn1,OUTPUT);
  pinMode(motorIn2,OUTPUT);

  pinMode(Servo_Pin, OUTPUT);  //初始化舵机为输出模式
  myservo.attach(Servo_Pin);    //设置舵机控制引脚为6
  myservo.write(0);    //初始化舵机位置0
  set_tele();
  Serial.begin(9600);
} 
void loop()
{
    
      
  boolean stat = digitalRead(digitalInPin);
  Serial.print("D0: "); 
  Serial.println(stat); // print to serial monitor 
  Serial.println(" ");

  
  Astate=analogRead(analogPin);//read the value of A0
  Serial.println(Astate); //peint 

  if( stat == LOW)
  {
    
    
    analogWrite(motorIn1,0);
    analogWrite(motorIn2,rank3);
    
    analogWrite(redPin, 255); //red
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 0);
    //digitalWrite(buzzerPin,LOW);

    myservo.write(90); //舵机旋转至90度
    delay(5000);      // 延时3000ms
    myservo.write(0);//舵机旋转至0度
    delay(1000);      // 延时3000ms

    for(int i = 200;i <= 500;i++)   //frequence loop from 200 to 800
      {
    
    
        tone(8,i);   //in pin7 generate a tone,it frequence is i
        delay(2);    //wait for 5 milliseconds   
      }
      delay(1000);   //wait for 4 seconds on highest frequence
      for(int i = 500;i >= 200;i--)  //frequence loop from 800 downto 200
      {
    
    
        tone(8,i);  //in pin7 generate a tone,it frequence is i
        delay(2);  //delay 10ms
      }

      tele();
  }

  
  if((Astate>120 && Astate<150))
  {
    
    
    analogWrite(motorIn1,0);
    analogWrite(motorIn2,rank1);
    
    analogWrite(redPin, 0); //red
    analogWrite(greenPin, 255);
    analogWrite(bluePin, 0);
    
    //digitalWrite(buzzerPin,LOW);

    myservo.write(90); //舵机旋转至90度
    delay(5000);      // 延时3000ms
    myservo.write(0);//舵机旋转至0度
    delay(1000);      // 延时3000ms


    for(int i = 200;i <= 500;i++)   //frequence loop from 200 to 800
      {
    
    
        tone(8,i);   //in pin7 generate a tone,it frequence is i
        delay(10);    //wait for 5 milliseconds   
      }
      delay(4000);   //wait for 4 seconds on highest frequence
      for(int i = 500;i >= 200;i--)  //frequence loop from 800 downto 200
      {
    
    
        tone(8,i);  //in pin7 generate a tone,it frequence is i
        delay(10);  //delay 10ms
      }

  }
  else if((Astate>=150 && Astate<200))
  {
    
    
    analogWrite(motorIn1,0);
    analogWrite(motorIn2,rank2);
    
    analogWrite(redPin, 0); //red
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 255);
    //digitalWrite(buzzerPin,LOW);

    myservo.write(90); //舵机旋转至90度
    delay(5000);      // 延时3000ms
    myservo.write(0);//舵机旋转至0度
    delay(1000);      // 延时3000ms

    for(int i = 200;i <= 500;i++)   //frequence loop from 200 to 800
      {
    
    
        tone(8,i);   //in pin7 generate a tone,it frequence is i
        delay(5);    //wait for 5 milliseconds   
      }
      delay(2000);   //wait for 4 seconds on highest frequence
    for(int i = 500;i >= 200;i--)  //frequence loop from 800 downto 200
      {
    
    
        tone(8,i);  //in pin7 generate a tone,it frequence is i
        delay(5);  //delay 10ms
      }
    
  }
  else if((Astate>=200))
  {
    
    
    analogWrite(motorIn1,0);
    analogWrite(motorIn2,rank3);
    
    analogWrite(redPin, 255); //red
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 0);
    //digitalWrite(buzzerPin,LOW);

    myservo.write(90); //舵机旋转至90度
    delay(5000);      // 延时3000ms
    myservo.write(0);//舵机旋转至0度
    delay(1000);      // 延时3000ms

    for(int i = 200;i <= 500;i++)   //frequence loop from 200 to 800
      {
    
    
        tone(8,i);   //in pin7 generate a tone,it frequence is i
        delay(2);    //wait for 5 milliseconds   
      }
      delay(1000);   //wait for 4 seconds on highest frequence
      for(int i = 500;i >= 200;i--)  //frequence loop from 800 downto 200
      {
    
    
        tone(8,i);  //in pin7 generate a tone,it frequence is i
        delay(2);  //delay 10ms
      }

      tele();
/*      
    Serial.print("AT+CMGD=1");
    Serial.print("\r\n");
    Serial.print("AT");
    Serial.print("\r\n");
    Serial.print("AT+CPIN?");
    Serial.print("\r\n");
    Serial.print("AT+CSQ");
    Serial.print("\r\n");
    Serial.print("AT+CREG?");
    Serial.print("\r\n");
    Serial.print("AT+CGATT?");
    Serial.print("\r\n");
    Serial.print("ATD15336551683;");
    Serial.print("\r\n");
*/    
  }
  else
  {
    
    
    analogWrite(redPin, 0); //red
    analogWrite(greenPin, 0);
    analogWrite(bluePin, 0);
    
    //digitalWrite(buzzerPin,HIGH);
    pinMode(buzzerPin,INPUT);
    pinMode(motorIn1,0);
    pinMode(motorIn2,0);
  }

  
  
  delay(200);//delay 200ms


 while (Serial.available())
    {
    
    
      comdata= Serial.read();
      if(comdata==49)
      {
    
    
        Serial.print("open the door\n");
        myservo.write(90); //舵机旋转至90度
        delay(1000);      // 延时3000ms
        myservo.write(0);//舵机旋转至0度
        delay(1000);      // 延时3000ms
      }
      if(comdata==50)
      {
    
    
        Serial.print("open fmq\n");
        for(int i = 200;i <= 500;i++)   //frequence loop from 200 to 800
      {
    
    
        tone(8,i);   //in pin7 generate a tone,it frequence is i
        delay(5);    //wait for 5 milliseconds   
      }
      delay(4000);   //wait for 4 seconds on highest frequence
      for(int i = 500;i >= 200;i--)  //frequence loop from 800 downto 200
      {
    
    
        tone(8,i);  //in pin7 generate a tone,it frequence is i
        delay(10);  //delay 10ms
      }
        delay(100);
     }
     if(comdata==51)
      {
    
    
        Serial.print("close fmq\n");
        pinMode(buzzerPin,INPUT);
        delay(100);
     }
     if(comdata==52)
      {
    
    
        Serial.print("111\n");
        analogWrite(motorIn1,0);
        analogWrite(motorIn2,rank1);
        delay(100);
     }
     if(comdata==74)
      {
    
    
        Serial.print("222\n");
        analogWrite(motorIn1,0);
        analogWrite(motorIn2,rank2);
        delay(100);
     }
     if(comdata==54)
      {
    
    
        Serial.print("333\n");
        analogWrite(motorIn1,0);
        analogWrite(motorIn2,rank3);
        delay(100);
     }
    }
}

五、演示视频

B站演示视频
CSDN演示视频