Read Dallas iButton Arduino

Requirements:

-Arduino board

-OneWire Library (unzip and copy to arduino-1.0.3/libraries)

-Maxim Ibutton DS1990

-Maxim Touch Probe Read

 Schematic

 Breadboard Connection

Code: 

 #include <OneWire.h>

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

byte buffer[20]; //array to store the Ibutton ID.

void setup(){
 Serial.begin(9600); 
   
}

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
   
   //crc compute//
   byte crc;
   crc = ibutton.crc8(buffer, 7);
   Serial.println(crc,HEX);
 
     
} 

/*by Elimeléc

 Jun-07-2013

*/