Game port photogate

photogate

Hack-A-Day regular [Andrew] has posted an incredibly simple game port based photogate. He uses a pair of light dependent resistors. Each one is placed inside of a ballpoint pen tube to limit ambient light on the sensor. He’s got a simple QBasic program to calculate the velocity of an object passing the sensors. You’ll have to run it inside a DOS emulator to get access to the game port under XP.

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