Use stm32f103cbt6 as the core. Students who do not have this chip can use stm32f103c8t6 instead.
In order to save space, the 7805 solution is used in the power supply part. However, since this is an LDO, heat generation is inevitable. In severe cases, it may reach 70~80℃. Students who have the conditions can use DC-DC voltage stabilization instead.
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