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RS 485
- 两块stm32板进行远程通讯,分别按下4个K键,数码管个位十位百位千位加一,主板与从板同步,并有倒计时功能。(Two pieces of STM32 board for remote communication, respectively press 4 K keys, the digital tube bit ten bits thousand bits plus one, the main board and from the board synchronization, and have