Smoke Alarm by Email

Introduction

This is an open source alarm device.

When the concentration of toxic gas is high, MQ2 Shield alerts by sending email .This is used in gas leakage detecting equipments in family and industry, are suitable for detecting of LPG, i-butane, propane, methane ,alcohol, Hydrogen, smoke.

Features

• Wide detecting scope
• Fast response and High sensitivity
• Stable and long life
• Simple set up

Usage

Set Up

Debugging steps

• 1. Connect these three boards as shown in the above. Power it by USB.
• 2. Download programs to Arduino.
• 3. Open serial debugging tools. Use lighter or other tool that can distribute gas around MQ2 sensor. (Default setting is when output number is more than 50, send mails ) User and password have to be encrypted by Base64.

• 4. Pay attention to mail server IP and port. The setting has to be correct. Or the mail receiving will be failed. Mail is as following picture shows (test sina and yahoo). Here we suggest use yahoo mailbox.

• 5. During sending the mail, if long time no connection to the server, wifi will shut down automatically. Program has been added soft wdt. When wifi is shut down it will jump to OOOOH address of the program automatically.

Sample Code

The sample Arduino code is provided here: <syntaxhighlight lang="c">

1. include <MsTimer2.h>
2. include <WiShield.h>
3. define WIRELESS_MODE_INFRA 1
4. define WIRELESS_MODE_ADHOC 2

//#define DEBUG // Wireless configuration parameters ---------------------------------------- byte local_ip[] = {192,168,3,178}; // IP address of WiShield byte gateway_ip[] = {192,168,3,1}; // router or gateway IP address byte subnet_mask[] = {255,255,255,0}; // subnet mask for the local network prog_char ssid[] PROGMEM = {"SOLID"};// max 32 bytes

unsigned char security_type = 2; // 0 - open; 1 - WEP; 2 - WPA; 3 - WPA2 int wait = 500; //delay time const prog_char security_passphrase[] PROGMEM = {"wxst2010"}; // max 64 characters

int WIFI_LED; //wifi connect LED // WEP 128-bit keys // sample HEX keys prog_uchar wep_keys[] PROGMEM = {

 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d,	// Key 0
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,	// Key 1
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,	// Key 2
 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00	// Key 3

};

//--------------------------------------------------------------------------- unsigned char wireless_mode = WIRELESS_MODE_INFRA;

unsigned char ssid_len; unsigned char security_passphrase_len; byte server_ip[] = {202,165,103,162}; //yahoo //byte server_ip[] = {219,142,78,189}; //sina Client client(server_ip,25); //sina,yahoo // MQ2 configuration parameters ------------------- const int analogInPin = A0; // Analog input pin that the potentiometer is attached to int sensorValue = 0; // value read from the pot int outputValue = 0; /********** jump to 0000H **********/ void (*reset)(void)=0x0000; /********** Time2 interrupt **********/ void flash() {

 MsTimer2::stop();
 reset();

}

void setup() {

 MsTimer2::set(60000, flash);                                              // soft wdt period (1 minute)
 WDT_reset();                                                              // clear soft wdt 
 Serial.begin(9600);
 delay(100);
 Serial.println("BEGIN");                                                 //begin mark
 delay(100);
 WiFi.begin(local_ip, gateway_ip, subnet_mask);                            //wifi begin
 delay(1000);
 Serial.println("first connecting...");                                   //wifi begin mark
 client_connect();

}

void loop() {

   WDT_reset();                                                             //clear soft wdt
   sensorValue = analogRead(analogInPin);                                   // read the analog in value:   
   outputValue = map(sensorValue, 0, 1023, 0, 255);                         // map it to the range of the analog out:
   Serial.print("sensor = " );                       
   Serial.print(sensorValue);      
   Serial.print("\t output = ");      
   Serial.println(outputValue);
   delay(500);
   if(outputValue>=50){                                                     //check the vaule of MQ2
     WIFI_LED=digitalRead(9);                                               //check the state of wifi connect led
     if(WIFI_LED)
     {
       delay(500);
       if(!client.connected())                                              //check the connected state of client
       {
         client_connect();
       }
       else                                                          
       {
          Serial.println("connected");
          delay(2000);
          SMTP_email_command();
       }
     }
     else                                                                    //if wifi off restar wifi
     {
       WDT_reset();
       Serial.println("WIFI_OFF");
       WiFi.begin(local_ip, gateway_ip, subnet_mask);
       delay(1000);
       Serial.println("WIFI_OFF restart...");
       client.connect();
     }
   }

} void SMTP_email_command(void) //smtp send mail {

    Serial.println("email");
    client.println("HELO");                                                     /* say hello (statement after helo is needed but irrelevant)*/
    delay(wait);
    SMTP_ACK();
    Serial.println("hello");
    client.println("auth login");
    delay(wait);
    SMTP_ACK();
    Serial.println("auth login");

    client.println("c3VuemhhbnNoYW4=");                                        //the name of yahoo,sina(Base64 encrypt)
    delay(wait);
    SMTP_ACK();
    Serial.println("name");

    //client.println("emhhbmdsaW4=");                                              //the password of sina(Base64 encrypt)
    client.println("c25vdzEzMTQ1MjA=");                                           //the password of yahoo(Base64 encrypt)
    delay(wait);
    SMTP_ACK();
    Serial.println("password");

    //client.println("MAIL FROM:<sunzhanshan@sina.com>");                          // identify sender, this should be the same as the smtp server you are using---sina 
    client.println("MAIL FROM:<sunzhanshan@yahoo.com.cn>");                        //identify sender, this should be the same as the smtp server you are using---yahoo
    delay(wait);
    SMTP_ACK();
    Serial.println("mail form");

    client.println("RCPT TO:<sunzhanshan1985@163.com>");                         /* identify recipient */
    delay(wait);
    SMTP_ACK();
    Serial.println("mail to");

    client.println("DATA");
    delay(wait);
    SMTP_ACK();
    Serial.println("data");

    //client.println("From: <sunzhanshan@sina.com>");                                 //sina
    client.println("From: <sunzhanshan@yahoo.com.cn>");                           //yahoo
    delay(wait);
    client.println("To: <sunzhanshan1985@163.com>"); 
    delay(wait);
    client.println("Subject: Alarm");                                                 /* insert subject */
    delay(wait);
    client.println();
    client.println("the gas concentration tested by MQ2 is " );                       /* insert body */
    client.println(outputValue);                                                      /* insert body */
    delay(wait);
    SMTP_ACK();
    Serial.println("Message");
    client.println();
    client.println(".");
    //client.println();
    delay(wait);
    SMTP_ACK();
    Serial.println(".the email end");
    //client.println();
    client.println("QUIT");
    delay(wait);
    SMTP_ACK();
    Serial.println("QUIT");

} /********** WDT_reset **********/ void WDT_reset(void) {

 MsTimer2::stop(); 
 delay(500);
 MsTimer2::start();

}

/********** server return data **********/ void SMTP_ACK() {

   while(client.available()) {
       char ACK = (char)client.read();
       Serial.print(ACK);
   }

} /********** client_connect **********/ void client_connect() {

 WDT_reset();
 if (client.connect())                                              //connect client
 {
    Serial.println("connect");
 }
 else
 {
    WDT_reset();
    WiFi.begin(local_ip, gateway_ip, subnet_mask);
    delay(1000);
    Serial.println("WIFI_OFF restart...");
    client.connect();
 }

}

</syntaxhighlight>