A small product that realizes the following functions:
In the interval between two stampings, the stamped parts must be discharged through the stamping monitoring light curtain. If there is no discharge within the set time, the machine must be stopped to avoid damaging the mold. It can be turned off when not in use without affecting the work. The monitoring time can be adjusted. The machine itself has photoelectric and pneumatic continuous punching, about 45 times per minute.
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PIC16C54 microcontroller, the time adjustment in the program can refer to "No AD port, temperature measurement through IO port (asm program)"
The waveform measured by the microcontroller pin during the experiment:
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