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
*/
