Arduino RFID Door Lock

Posted on Feb 5, 2014

The first step to building a RFID door lock with a basic Arduino is to bread board out a basic working arduino. Most Arduino pre-flashed ATMega 168 chips come with the default blink program pre installed. Connect a LED to digital output 13 and verify that everything is working. The hardware portion of this RFID reader would be too simple if we use

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d a regular arduino with built in USB programmer. Since Iplan on putting this into the wall and not touching it again Idont want to use a big bulky $30 arduino board when I can buy a $5 ATMega 168 and make a much smaller custom PCB. Because Ichose to make a basic Arduino circuit myself Ineed an external USB->Serial FDIT programmer. Ihave included Eagle schematics of the controller with a power supply built from a 7805 voltage regulator. In testing Iused a bread board power supply. To get an arduino up and running all you really need is the ATMega168 with the arduino software flashed on it, 2x 22pF capacitors, 16mhz crystal, 10k ohm resistor, push button and a breadboard. The hookup for this is well known but Ihave included the entire schematic for the circuit. The arduino is going to trigger 4 outputs, 1 each for Red/Green/Blue LEDs, and 1 to trigger the TIP31A to send 12vDC to the door lock. The arduino receives serial data in on its Rx line from the ID-20 RFID reader. Now that you have your arduino bread boarded and working you can put together the RFIDreader portion of the circuit that will contain the ID-10 or ID-20 and RGB LED to indicate the status of the circuit. Remember that the reader will be outside and separate from the controller inside so that someone cannot easily break in. To build this, we are going to send 5v/Ground over from the primary bread board to a secondary bread board we are building the Reader on....

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