2022-02-14 (M) RemoteFinishLine Explanation

A friend asked about making a single-person race timer. The concept is simple; when someone breaks a beam, a timer starts, and the timer stops when they break a second beam. Some factors make it more complex, like the start and finish line are not close enough to connect with a cable and may not have line-of-sight. The system must be simple to operate and understand.

I sketched my idea for a pair of identical boxes, each with a character display, light ring, and arcade button. The idea is that a race will tap the button on top, and that unit will become the start line. When they pass in front of the distance sensor, it sends a Bluetooth signal to its partner, starting a timer and monitoring its distance sensor. When the racer breaks the beam at the finish line, the time is displayed there and sent to the starting unit, where it also shows up. Either box can be the starting line.
Conceptual drawing

I mentally prepared this project with parts I had on hand, so I gathered them to get an idea of how it would come together. I chose small arcade buttons because they fit inside the light rings and Arduino Micros because they're inexpensive. I had an assortment of Bluetooth bridges, so I grabbed them, and I'll find a pair that works.

The rest of the posts for this project have been arranged by date.
First time here?

Completed projects from year 1
Completed projects from year 2
Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6
Completed projects from year 7
Completed projects from year 8

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