Monday, January 14, 2013

OpenROV Build Day 5

Parts for the electronics chassis laid out. This is a tricky assembly. It's important to get the chassis squared up, and the center of the servo should align with the center of the endcap. 
Camera mount with LED shields added. These shields keep the glare of the forward facing LED arrays from interfering with the camera.

The motor controllers are mounted in a group of three on the side away from the Beaglebone.


The end cap is tricky to put on. Glue on the fingers means fingerprints on the plastic.

The Beaglebone goes on this side. The plastic arrived pre-discolored for my convenience. I don't think the fish will care.

The other end piece is asymetric. The servo mounts offset with the axis in line with the center of the tube.

The whole platform should be square, which is tricky. If you were building more than one you would get good at this part.

It does slide into the tube, and rotates fairly smoothly. I'm worried about whether the servo will be strong enough to rotate the whole platform.

The camera mounts on the back of platform, and is held down with zip-ties. These are not the reusable ones that come with the kit.

The LED arrays are glued down. I used five minute epoxy. I glued a short strip of zip-tie tip to the ring of the lens, which allows manual focus. The lens ring is hard to manipulate without some sort of handle.

The OpenROV cape fits onto the Beaglebone. Watch out for bent pins (often happens on the outside pins). Straighten carefully before seating the cape. This takes a good bit of force.

These are the components for the tilt servo. There were no instructions in the assembly video, and none of the mounting components appear to be used.

Instead, use these four pieces.

I found it easier to put the nuts on the outside. Tighten with a nut driver, or use small pliers.

The whole assembly is held together with a reusable zip-tie. The camera platform is held down by the pressure of the tube.

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