I'm planning to build a laser tripwire tachometer that measures the frequency of beam breaks to calculate rpm. The device will break the beam at ~30,000 times/second at peak. Planning to use a 650nm laser with an LDR sensor module (xc4446) for detection, but it appears LDRs have a ~10ms latency. Wil…

[image] sit399: break the beam at ~30,000 times/second You should use a sensor that is at least 10x faster than that, that is, with a response time of less than 3 microseconds. A photodiode will work.

Will LDR sensor module latency be a problem?

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sit399 September 26, 2021, 5:31pm 6

Sorry mate made a typo, it was actually ~30,000/min, so about 500/second. Would you still recommend a photodiode for this situation?

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Will LDR sensor module latency be a problem?

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