2022-03-07 (M) RemoteFinishLine Lasers and reflectors

I bought three reflective things at a hardware store. I purchased a retroreflector mounted atop a fiberglass pole with a red body and white center, a pair of red reflectors, and some reflective tape. I held both laser units on the table and walked across the room to position the reflectors. Both retroreflectors worked well at three meters, and I didn't see much difference between the one with the lens and the one without. The advantage to the lensless version is that it won't detect a reflection on anything outside of 50cm, so anything passing between that distance and the reflector should be reliably detectable. Alternatively, I could attach a battery-powered laser to any surface and aim it at the detector, but that would require precision positioning. I searched for large reflectors online, but I didn't see anything promising.
Reflectors and camera flash

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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