使用单稳态触发电路作“延时”或“定时”用,由于受到元件和器件的影响,其精度不会太高。
The accuracy of delay or timing is not sensitive with monostable trigger circuit since electrical elements have influence on it.
事件延迟,毫秒。如果这个值不在定时器支持的最小和最大延时之间的话,函数将返回一个错误。
Event delay, in milliseconds. If this value is not in the range of the minimum and maximum event delays supported by the timer, the function returns an error.
设计了一个由微波发射器、555定时器、电压比较器和继电器组成的具有延时功能的自动报警器。
The paper designs an automatic alarm with the time delay function which composed by the microwave launcher, 555 timers, the voltage comparator and the relay.
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