Who will give you a complete paper on this? My previous graduation project was designed in this direction, which was mainly divided into banknote detection circuits (infrared or fluorescent). The magnetism was complicated, that is, the sensor and AD were sent to the pins of the single chip microcomputer, and then the control circuit, the single chip microcomputer, the memory chip and the display chip might be added with interface expansion. According to your design requirements, the undergraduate thesis is not very demanding on the scheme, just look for some information on the Internet ~ all parts of the circuit can be combined online.

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