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6 天
基于单片机的光电密码锁的原理(硬件电路及源程序)
密码是4321时,执行相应的密码正确动作,否则不执行。 (1)反射式光电对管前无障碍物,所以接收管不导通,其输出为高电平,经74LS04反向器后输出为低电平,LED1发光;当在对管前挡障碍物时,接收管导通,输出为高电平,LED1不发光。该输出端接单片机的T0脚。
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