Low-frequency card reader device based on em4095 that can recognize three modulation methods
A modulation method and card reader technology, used in instruments, inductive record carriers, computer parts, etc., can solve problems such as poor general performance, inability to recognize other types of radio frequency cards, and reduced work efficiency, achieving low cost and low cost. Resource cost, effect of improving versatility
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[0014] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0015] Such as figure 1 As shown, this embodiment adopts the main control module of low power consumption and high-performance STM32 single-chip microcomputer, 125K antenna, and the EM4095-based read-write module, LCD liquid crystal display module, and button circuit connected to the main control module and controlled by it . Specifically, the system uses STM32F103 single-chip microcomputer as the main control module, and controls the interpretation and display of the original data signal demodulated by EM4095 through the I / O port. The 125K antenna coil with figure 2 The two parallel capacitors C221 and C222 shown are connected in series to form a resonant circuit and resonate at 125KHz. When the 125KHz radio frequency card is placed on the antenna coil, the resonant circuit and the inductance coil in the card generate an alternating magnet...
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