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A device used to measure the speed of an object moving through it with utmost accuracy.

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Arduino-Chronograph

Code of an Arduino chronograph.

Designed for an Arduino Uno. I used two laser gates and two 3D printed holders. You can configure the distance from the two sensors(begining and end).

// convert mm/s to kph
kph = ((750000000 / elapsed_time) * 0.00036); 

In the current configuration the distance between sensors is 7.5cm or 750mm

You can make the samething by printing the part twice and buying an IR break beam (https://www.adafruit.com/product/2168)

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A device used to measure the speed of an object moving through it with utmost accuracy.

https://lynden.wiesenhaan.com/projects/Chronograph.html

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