The iButton garage-door opener (Arduino)

I've made an iButton garagedoor opener and logger.

On a Dutch (kind of) eBay (www.marktplaats.nl) I found some iButtons and readers very cheap. I had no idea what to do with them, but I bought them anyway.
My garage opens with a push on a button, so it must be possible to get that working with the iButton.
I also found some really cheap (0,50 euro) displays, so it would be nice if I also can make a screen to show me who entered when.
The project is now existing in three parts:

1. The iButton opening the door
2. A clock keeping track of times and dates
3. A screen showing the information

So to keep things understandable I try first to figure out the three parts separately.

Step 1 You will need

Parts

• iButton(s)
• iButton reader
• Arduino
• 2 push buttons
• power supply
• 2 10 kOhms resistors
• 220 Ohms resistor
• 2,2 kOhms resistor
• 10 kOhms potmeter
• LCD-display with HD44780 controller
• NPN transistor
• relais
• 1N4001 diode
• some wire
• PCB

Tools

• soldering iron
• solder
• snips
• breadboard
• computer with Arduino software
• a LED

Comments

[techxpert]

one question what's a ibutton

[kenyer]

Hi, A iButton is a kind of electronic key, that looks like a button-battery. You can see them in the picture above. Every iButton has an unique number that is written in a chip inside. The communication with the iButton goes trough the 1-Wire protocol and uses, you guessed it, only one wire. See also the site off the manufacturer: Maxim

[techxpert]

thanks :)

[alahamm]

Nice job! Sure wish I had all those tools, but I´ll settle for a translator.

[nolte919]

Where oh where did you find LCD displays for less than a buck??

[kenyer]

On "www.marktplaats.nl" that's a Dutch kind of Ebay. I was really lucky with them.

[Cello62]

Nice project and a very good instructables.

[jam BD]

Amazing project... Nice integration and great 'ible