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你的电路原理图是怎么连接的
18脚，21脚和17脚是怎么接的
18接低，20和21连接，17接单片机I/O口，电路图在附件中，请问我可否给你打电话交流？
你好，请问你的问题解决了没有，我也遇到一只读取高电平的现象
