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  • Linux Format

    Make a model train scale-speed monitor

    Nov 15, 2022 5 minutes

    OUR EXPERT

    Sean Conway is a former IT security specialist from a national telecommunication company who implements Pi-based projects to get his muchneeded technology fix after retiring.

    YOU NEED

    Raspberry Pi 3 B+

    16GB SD card

    Raspberry Pi OS Lite (used: 4 April 2022)

    GPIO Zero 1.6.2

    IR sensors

    H ave you ever seen something and thought, “I can do that”? This writer’s inspiration came after using a commercial device to determine the speed of a model train. The speed limit posted for a real train entering a siding is 16kph. So let’s use a Raspberry Pi, with some external infrared (IR) sensors mounted to a block of wood of known dimensions, to establish the scale speed of a model train entering the siding on a model railway layout.

    Typical full-size trains

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