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.
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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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