Code
Latest source code is available at http://www.dejanlevec.com/code/Microcontrollers/RFID-Reader/14-Jun-2009/.
Hex file is available only for ATmega8 at 16MHz. Host executable is available only for Intel Macs with latest software update.
Currently you need to request ID from a device.
Example: ./set-led status
Receiving ID when tag is scanned is still in progress. (I have some problems with USB interrupt-in)
Circuit
Components for USB are connected as usual. (D+ on PB2, D- on PB4). Green LED is connected to PC5 (28), yellow LED to PC3 (26). TX from RFID module is connected to RX on AVR (PB0 on ATMega8/168).
Parts
* RFID module (seeedstudio – $12.50)
* RFID tags (seeedstudio – $2.50)
* ATmega8 microcontroller (or similar)
* 16Mhz quartz (or 12Mhz)
* 2x 3.6V or 3.3V zener diode
* 1x green LED
* 1x yellow LED
* 2x 68 R (or other 12 – 100 ohm resistors)
* 1k5 resistor
* 10 uF capacitor
* 2x 330 ohm
* 28 pin socket
Latest update on: 14 Jun 2009 @ 7:20 PM