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I want to measure speed with one infra gate. The width of the bypassing object is known therefore I could calculate the speed. However the infrared gate would be interrupted only for 3-10ms. I understand raspi is not real time but it doesn't matter for me as far as I can get the exact time between low-high and high-low.

Andras Csehi
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My pigpio library will let you reliably time gpio transitions to within a few microseconds.

The library itself is written in C but you can use any language you want to capture the data (the events are time-stamped at source).

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joan
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