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

火焰传感器

无源蜂鸣器

三色LED灯

步进电机

风扇

WIFI模块(局域模式)

SIM900A模块

舵机模块

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* GNDGND* * * 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myservoconst int digitalInPin = 2; //D0 attach to digital 2const int analogPin=A0; //the DO on the Module attach to Pin7 on the SunFounder const int digitalPin=7; //the D0 attach to pin7int Astate=0;boolean Dstate=0;int redPin = 11; // select the pin for the red LEDint greenPin = 12; int bluePin = 13; int buzzerPin = 8;//the pin of the active buzzer attach to pin8int comdata;const int motorIn1 = 9;const int motorIn2 = 4;#define rank1 150#define rank2 200#define rank3 250void set_tele(void){Serial.begin(115200); //波特率为115200delay(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 OUTPUTpinMode(greenPin, OUTPUT);pinMode(bluePin, OUTPUT);pinMode(buzzerPin,OUTPUT);//set the buzzer as as OUTPUTdigitalWrite(buzzerPin,LOW);//initialize the buzzerPin as LOW levelpinMode(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6myservo.write(0); //初始化舵机位置0set_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 A0Serial.println(Astate); //peint if( stat == LOW){analogWrite(motorIn1,0);analogWrite(motorIn2,rank3);analogWrite(redPin, 255); //redanalogWrite(greenPin, 0);analogWrite(bluePin, 0);//digitalWrite(buzzerPin,LOW);myservo.write(90); //舵机旋转至90度delay(5000);// 延时3000msmyservo.write(0);//舵机旋转至0度delay(1000);// 延时3000msfor(int i = 200;i <= 500;i++) //frequence loop from 200 to 800{tone(8,i); //in pin7 generate a tone,it frequence is idelay(2); //wait for 5 milliseconds }delay(1000); //wait for 4 seconds on highest frequencefor(int i = 500;i >= 200;i--) //frequence loop from 800 downto 200{tone(8,i); //in pin7 generate a tone,it frequence is idelay(2); //delay 10ms}tele();}if((Astate>120 && Astate<150)){analogWrite(motorIn1,0);analogWrite(motorIn2,rank1);analogWrite(redPin, 0); //redanalogWrite(greenPin, 255);analogWrite(bluePin, 0);//digitalWrite(buzzerPin,LOW);myservo.write(90); //舵机旋转至90度delay(5000);// 延时3000msmyservo.write(0);//舵机旋转至0度delay(1000);// 延时3000msfor(int i = 200;i <= 500;i++) //frequence loop from 200 to 800{tone(8,i); //in pin7 generate a tone,it frequence is idelay(10); //wait for 5 milliseconds }delay(4000); //wait for 4 seconds on highest frequencefor(int i = 500;i >= 200;i--) //frequence loop from 800 downto 200{tone(8,i); //in pin7 generate a tone,it frequence is idelay(10); //delay 10ms}}else if((Astate>=150 && Astate<200)){analogWrite(motorIn1,0);analogWrite(motorIn2,rank2);analogWrite(redPin, 0); //redanalogWrite(greenPin, 0);analogWrite(bluePin, 255);//digitalWrite(buzzerPin,LOW);myservo.write(90); //舵机旋转至90度delay(5000);// 延时3000msmyservo.write(0);//舵机旋转至0度delay(1000);// 延时3000msfor(int i = 200;i <= 500;i++) //frequence loop from 200 to 800{tone(8,i); //in pin7 generate a tone,it frequence is idelay(5); //wait for 5 milliseconds }delay(2000); //wait for 4 seconds on highest frequencefor(int i = 500;i >= 200;i--) //frequence loop from 800 downto 200{tone(8,i); //in pin7 generate a tone,it frequence is idelay(5); //delay 10ms}}else if((Astate>=200)){analogWrite(motorIn1,0);analogWrite(motorIn2,rank3);analogWrite(redPin, 255); //redanalogWrite(greenPin, 0);analogWrite(bluePin, 0);//digitalWrite(buzzerPin,LOW);myservo.write(90); //舵机旋转至90度delay(5000);// 延时3000msmyservo.write(0);//舵机旋转至0度delay(1000);// 延时3000msfor(int i = 200;i <= 500;i++) //frequence loop from 200 to 800{tone(8,i); //in pin7 generate a tone,it frequence is idelay(2); //wait for 5 milliseconds }delay(1000); //wait for 4 seconds on highest frequencefor(int i = 500;i >= 200;i--) //frequence loop from 800 downto 200{tone(8,i); //in pin7 generate a tone,it frequence is idelay(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); //redanalogWrite(greenPin, 0);analogWrite(bluePin, 0);//digitalWrite(buzzerPin,HIGH);pinMode(buzzerPin,INPUT);pinMode(motorIn1,0);pinMode(motorIn2,0);}delay(200);//delay 200mswhile (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3000msmyservo.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 idelay(5); //wait for 5 milliseconds }delay(4000); //wait for 4 seconds on highest frequencefor(int i = 500;i >= 200;i--) //frequence loop from 800 downto 200{tone(8,i); //in pin7 generate a tone,it frequence is idelay(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

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