说明：  no intro
(RFID reader program. Hardware it works: At the base station on the case of electricity through the coupling coil 125k launch the sine wave frequency, ID card at the coupling coil 125k inspired by the sine wave generated electromotive force sensors, which provide power throughout the ID card. ID card through the modulation circuit in accordance with its type of data card ID card issued sinusoidal coupling coil, the base station to receive the coupling coil, in accordance with the different wave 125k to express different sets of data. And Manchester, through DATA-side code in the form of output.)