2019-08-25 (Su) PillarGame

It will be vital to know the position of the rotating cylinder so an optical sensor will monitor dark and light stripes which amounted to a homemade encoder. The steady location of the IR emitter and sensor unit may be tricky. A camera mount for a security camera offers a couple of articulated joints and 1/4-20 threaded posts on either side, so it is easy to mount.
Security camera mount and IR sensor

A #4 standoff went through the hole of the IR sensing unit but, it was tricky to couple the two threaded components. I look for a small bit of plastic to put two holes in it to accept bolts of either size. Before I found suitable plastic, the kind that would not shatter, I found some articulated tubing that could accommodate a #4 bolt and was also longer than the camera mount.
Articulated nozzle and IR sensor

With a bright light, it was possible to see the #4 bolt and screwdriver bit inside the plastic nozzle. As fortune would have it, the bolt head was large enough to trap it inside the tip while the threaded portion was small enough to pass through the opening without modifying anything. I used a pan head bolt, but a countersunk head might have been a better choice.
Bolt visible inside nozzle

Since the nozzle was pointed plastic, I removed the standoff and nylon washer that was resting against the PCB. I thought this portion of the project would be exceptionally traumatic, but if I get good readings with this positioner, it will be a blessing.
Fewest parts for an easy-to-position sensor

First time here?

Completed projects from year 1
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Completed projects from year 3
Completed projects from year 4
Completed projects from year 5
Completed projects from year 6

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