Rfid Door Lock Description

Topics: RFID, Printed circuit board, Microcontroller Pages: 18 (3994 words) Published: August 14, 2011
RFID Door Lock

Version 1.0
October 2009
Cytron Technologies Sdn. Bhd.
Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Cytron Technologies Incorporated with respect to the accuracy or use of such information or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Cytron Technologies’s products as critical components in life support systems is not authorized except with express written approval by Cytron Technologies. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights.

This document describes the development of Cytron Technologies DIY (Do It Yourself) Project PR25. This project revises PR8: Read and Display and PR9: Password Door Security. However, this project improves the previous PR, where it can learn new RFID ID tag and read ID tag in two different communication ways, Wiegand and UART. Connection for UART and Wiegand RFID tag reader are provided on PCB to be extended. Schematic and source code is also provided.

PIC16F876A - 8-bit microcontroller with 22 I/O - Operate with 5V supply - Operating speed 20MHz WIEGAND RFID TAG READER - RFID tag reader with specification reader-tocard and binary reader-to-controller interface - Standard 26-bit binary card data format - Operate with 5V supply

Created by Cytron Technologies Sdn. Bhd. – All Rights Reserved


ROBOT . HEAD to TOE PR25 – RFID: Read and Display


Push Button


RFID Tag Reader LCD Door Lock


PR25 is an open source microcontroller Do It Yourself kit. This PIC microcontroller based project is designed to develop a low cost RFID door lock. It combine the features and functions of PR8 (RFID: Read and Display) and PR9 (Password Door Security). When RFID tag is place near to RDIF reader, the reader can read RFID tag, further send the tag ID to the PIC microcontroller. After PIC microcontroller process the data, the tag ID will display on LCD in decimal number and only particular RFID tag can pass the door lock. However, this project improves the previous PR, where it can read ID tag in two different communication ways, Wiegand and UART. And connection for UART and Wiegand RFID tag reader are provided on PCB to be extended. Besides, it also can “learn” new ID tag. The new RFID tag saved can open the door lock for next time used. This DIY project also provides LCD (2x16 characters) for user to display the status. Buzzer is not provided as there is an internal build buzzer inside the RFID tag reader.

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2 capture/compare/PWM functions synchronous serial port can be configured as either 3-wire Serial Peripheral Interface (SPI™) or the 2-wire Inter-Integrated Circuit (I²C™) bus Universal Asynchronous Receiver Transmitter (UART).

All of these features make it ideal for more advanced level A/D applications in automotive, industrial, appliances and consumer applications.

This powerful (200 nanosecond instruction execution) yet easy-to-program (only 35 single word instructions) CMOS FLASH-based 8-bit microcontroller packs Microchip's powerful PIC® architecture into an 40- or 44-pin package and is upwards compatible with the PIC16C5X, PIC12CXXX and PIC16C7X devices. Features of the device: • • • • 256 bytes of EEPROM data memory self programming 2 Comparators 8 channels of 10-bit Analog-to-Digital (A/D) converter Figure 1 Figure 1 shows the pin diagram for PIC16F876A. For more information about the PIC microcontroller, please refer to the datasheet. The datasheet can be found in microchip web site at: http://www.microchip.com

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