Section 1. 1 Hardware Circuit Overview The temperature measuring system consists of five parts: power module, detection module, display module, control module and communication module. The power supply module completes the task of converting 200V and 50Hz commercial power into stable DC +5V power supply, including four parts: voltage transformation, rectification, filtering and voltage stabilization, in which the voltage stabilization part adopts LM7805 integrated block. The task of serial communication module is to realize the communication between single chip microcomputer and computer, and download the program to single chip microcomputer for debugging through software.

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