Remote Door Open by SMS using Arduino

GSM Module used:

SIM900
Wiki
Testing the module


Video:

Code:

// this code was tested using the modem SIM900

/*

this code turn "On" and "Off" an LED by SMS.

Commands:

$ON$
$OFF$

Note: the commands are case sensitive.

*/


#include <SoftwareSerial.h>

SoftwareSerial mySerial(7, 8); // RX, TX

byte led = 13;   // use "byte" instead of "int" to save memory.
byte led_on = 0;
byte led_off = 0;
byte dollar_count = 0;

long last_millis = 0;
const int delay_time = 5000;

const int buff_size = 10;
char buffer[buff_size];

void setup()  
{
  pinMode(led, OUTPUT);
  mySerial.begin(9600);
  Serial.begin(9600);
 
   mySerial.println("AT\r\n"); // check communication with the modem.
   delay(500);
   mySerial.println("AT\r\n");
   
   //delete all read SMS
   
   for(int x=1; x<=20; x++){
   mySerial.print("AT+CMGD=");
   mySerial.print(x);
   mySerial.print(",");
   mySerial.print("3");
   mySerial.print("\r\n");  
   delay(1000);
   }
   
  
 
}

void loop(){

     
     if ((millis() - last_millis) > delay_time ){
       mySerial.print("AT+cmgl=\"REC UNREAD\"\r\n");
       last_millis = millis();
     }
  

  if (mySerial.available() > 0){

    char inchar = mySerial.read(); // print in data to  software serial port for debug perpose.
    
    Serial.print(inchar);

    if(inchar == '\r' || inchar == '\n'){
      dollar_count = 0;
      led_on = 0;
      led_off = 0;
    }

    if(inchar == '$'){
      dollar_count++; 
     } 
    

      switch (dollar_count){
      case 1:
      
      if(inchar == 'O' || inchar == 'N'){
        led_on++;
      }
      
      if(inchar == 'O' || inchar == 'F'){
        led_off++;
      }
      
      if(led_on == 2){
        digitalWrite(led, HIGH);
      }
      
      if(led_off == 3){
        digitalWrite(led, LOW);
      }
      
      break;
        
      }  


  }


}

                                                                                           By: Elimeléc 

Door Open with Dallas iButton Arduino

 Requirements

 Video

Schematic 

 Breadboard Connection

 Code

 #include <OneWire.h>

OneWire ibutton (2); // I button connected on PIN 2.

byte ibuttonid[10] = {1,144,74,165,21,0,0,143}; // Ibutton ID must be typed in Decimal in the following order: Family code (01 for DS1990); numbers from R. to L.; CRC. 
byte buffer[10]; //array to store the readed Ibutton ID.

boolean result;  // this variable will hold the compare result

int doorpin = 13; // the output pin to activate the door.

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

void loop(){
   
 if (!ibutton.search (buffer)){//read attached ibutton and asign value to buffer
    ibutton.reset_search();
    delay(200);
    return;
 }
  
  for (int x = 0; x<8; x++){  
    Serial.print(buffer[x],HEX); //print the buffer content in LSB. For MSB: for (int x = 8; x>0; x--) 
    Serial.print(" "); // print a space
   }
   Serial.println("\n"); // print new line
   
   // compare the ibutton id
   
  result = true; // set variable equal to one.
  for (int x=0; x<10; x++){ 
  int compare1 = ibuttonid[x];// asign each index of arrays to test, one by one and compare
  int compare2 = buffer[x];
  
  
  if(compare1 != compare2){ // if any index comparison is not equal, then the arrays are not equal and result will be 0.
   result = false; 
  }
  
  }
  if(result == true){ // if the arrays are equal, do something.
   Serial.println("Door open for 5 seconds."); 
   digitalWrite(doorpin,HIGH); // Turn on LED on pin 13 (build-in on the Arduino board)
   delay(5000); // wait five seconds. (1 second = 1000 milliseconds)
   Serial.println("Door closed");
   digitalWrite(doorpin,LOW); // turn off LED.
 }
   
    //set buffer back to cero.
    
    for (int x=0; x<10; x++){
     buffer[x] = 0 ;
    }                
}



/* by Elimeléc 
  Jun-07-2013
*/