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NFC based Transmitter and receiver

This project has been made without using a commercially available NFC module. Instead of using the module, they have used coupled coils to transmit message modulated by a high frequency carrier, whose frequency is the standard frequency for Near Field Communication (NFC). A similar coil is also used, both of which are tuned to resonate at the frequency of 13.56MHz. The modulation of the carrier takes place using a MCU. A similar MCU is also used to demodulate the signal and display on LCD. The transmitter block includes user interface (ATmega1284p), local oscillator (13.56MHz carrier generator) and antenna (LC Tank). The receiver block includes a antenna, demodulation and ADC Circuit (unity gain amplifier and hysteresis comparator with inverting-input) and signal processing unit (ATmega1284p). The reader should keep in mind that this project is being used to understand the working of wireless module instead of a detailed application. However, I highly recommend this since a similar ay to transmit messages can be used by a large number of applications. Continue reading