The lid servo fix by installing foam.
the outer edges with a pair of scissors. With the foam in
place, I started getting more consistent readings on the
sonar which was in line with what I expected.
The remaining issue I ran into was that occasionally the
lid servo would shimmy/shake while hunting to stop at the
desired position. Luckily, the fix for that wasn’t too bad. I
just cut a couple lengths of non-dense foam weather
stripping and installed those on the side of the cover
holding the lid. It would gently rub against the lid providing
a little resistance — not enough to slow down or prevent
the lid from moving, but just enough to dampen the
hunting effects. It cured the problem.
Suggestions to Upgrade and
Improve the MiniBot
With a good solid platform as the basis for your robot,
you can easily enhance it and expand on it. One of the first
mods I would suggest is adding a switch between the
power lead of the main drive servos.
This way, you have an easy way to disable just the
movement of the robot. This helps if you are doing
development since you can guarantee it won’t try to run
away when you are downloading a new version of code to
it. This is also useful if you want to use the robot on a desk
to make sure it won’t drive itself off the table.
I’ve been installing this feature as a standard part of
my larger robots but find that it is an easy mod and worth
56 SERVO 05.2013
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