AIM:
To design an effective ATM system based on RFID by using 8 bit controller [AT89C51]
ABSTRACT:
RFID is an acronym for Radio Frequency Identification. RFID is one member in the family of Automatic Identification and Data Capture (AIDC) technologies and is a fast and reliable means of identifying just about any material object. Primarily, the two main components involved in a Radio Frequency Identification system are the Transponder (tags that are attached to the object) and the Interrogator (RFID reader). Communication between the RFID reader and tags occurs wirelessly and generally doesn’t require a line of sight between the devices. RFID tags are categorized as either active or passive. Active RFID tags are powered by an internal battery and are typically read/write, i.e., tag data can be rewritten and/or modified.
RFID based ATM system is a very innovative and interesting project that can play a vital role in banking applications. In general we are using magnetic strip cards to access the ATM system. There will be magnetic strip reader in the ATM machine; we need to insert our ATM card into that to access. All this process is contact based. We can upgrade this process to contact less by replacing magnetic strip cards with RFID cards. There will be RFID reader in the ATM machine. Just showing our RFID card infront of the RFID reader is enough to access the machine.
The significant advantage of all types of RFID systems is the non contact, non-line-of-sight nature of the technology. Tags can be read through a variety of substances such as snow, fog, ice, paint, crusted grime, and other visually and environmentally challenging conditions, where barcodes or other optically read technologies would be useless. Hence this project can be very much useful and can be implemented in real time applications for recording the attendance. In this project user can process money transaction through RFID card. Microcontroller can validate RFID cards. Microcontroller allows valid card with password access. For invalid cards microcontroller displays message on LCD.
This project uses regulated 5v, 500mA power supply. 7805 and 7812 three terminal voltage regulators are used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/12v step down transformer. The RFID module requires a separate +5v power supply.
Requirements:
- AT89C51 controller
- RFID reader
- RFID tags
- Relay
- RS232 cable
- MAX 232 [line converter]
- LCD