ATtiny85 – RC switch

I have finally managed to program an ATtiny85 to act as a RC switch! The switch will work as a “poor-man’s-ESC-reverse”. I bought a cheap ESC for my Ballbot Project and it has no reverse mode, it is made for RC aeroplanes, so I have to implement a relay that acts as a “polarity-switch” to be able to make a reveres motion on the motors.

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fireNest 6ch remote

Yesterday I finally continued the build of the remote control for fireCrow v2.0. It was quite some time since last I worked with the firing system now so I thought I’d better get cracking!


The remote control box with buttons, one of the two rotary switches,
a key switch (on the short side beneath the red buttons), and a vinyl sticker

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Repair your $700 digital height gauge

If your height gauge on/zero/off button stops working, there’s no need to send your tool to a repair man and pay plenty of cash to get it fixed!


Before doing anything you’ll need to remove the battery. Then you take a X-Acto knife (or similar) and carefully peel of the ISO sticker on the backside of the tool.


Beneath the sticker you’ll find the hidden screws for the plastic hood.

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Ballbot – assembled parts

I’ve been doing a lot of work since last time and there have been some changes in the design as well!

After I assembled a couple of parts in FreeCAD I realized that I had miscalculated (in my head) the size of some of them :(
I had to flip the base plate upside down to make room for the steering cradle and remove the friction wheels, because they wouldn’t fit anymore. I also had to make the propel wheel larger to get better grip and to make the ball go a bit faster.
The approximate speed is now somewhere about 10 km/h, which is a quite good speed I think.

Screenshot from 2014-02-25 11:52:48

The base plate front view – with motors and steering craddle and its servo

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