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up/down counter

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alec_t said:
Good question, crutschow. Even with a pair of sensors there would be problems if a person dithered at the gate and triggered one of the sensors multiple times, or for some reason failed to trigger both. That would need to be handled by software.
Click to expand...

4510 or 4516 is capable of up and down counting. So he can choose two pair of sensor(photo diode & infrared LED) one for counting and one for control the up/down pin of the chip.
In this way I made a counter 1 year ago and it is working fine still now.......
 
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