The design of the prepayment module of the heat meter based on MFRC522 introduces the composition and working principle of the prepayment module based on MFRC522 in the heat meter, and proposes the hardware circuit and software control process design scheme of the prepayment function. Through the power control of the IC card circuit and the drive solenoid valve, the system achieves low power consumption and high efficiency, creating conditions for solving the difficulty of charging by the heating company and improving residents\' awareness of saving. Composition and working principle of the prepayment module The heat meter is an instrument used to measure and display the energy released or absorbed by water flowing through the heat exchange system. It collects the temperature of the water inlet (outlet) and the water flow rate, and calculates the heat released by the system. The prepayment module is to achieve \'
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