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本定时钟系采用PIC系列单片机设计完成,由于该系列单片机的优异性能,由附图可以看出,外围结构相当简洁,因此,十分可靠与易用。该钟的定时时间能精确到分,可同时控制八路负载的定时开关,对其中的每一路每天可设置2个时段(即2开2关)定时,且能用手动随时控制任一路负载的开关。由于该型单片机的驱动能力较强(每个I/O口有20mA以上的驱动电流),各定时输出端可直接经限流电阻驱动光继电器或光电耦合器。电路见附图。为获得精确时钟,本机使用32768Hz
The timing of the clock system using PIC microcontroller design completed, due to the excellent performance of the family of microcontrollers, can be seen from the figure, the external structure is quite simple, therefore, very reliable and easy to use. The timing of the clock can be accurate to points, while the eight load control of the timing switch, each of which can be set up for each of the two time periods (ie, 2 to 2 off) timing, and can manually control any load switch at any time . Due to the strong driving capability of the SCM (each I / O port has a driving current of over 20mA), the timing outputs can directly drive the optical relay or optocoupler through the current limiting resistor. Circuit see the photo. To get a precise clock, the machine uses 32768Hz