Creating the microswitch bracket

Now that I have a 3D printer and am better at CAD I can draw things up and print them.

This is what I have done for a bracket to hold the micro switch to the millimetre above the end of the platform. The bracket has to reach over the top of the drawer runners too.

Below is the CAD drawing…


Here it is with the microswitch attached. The holes were so good, I don’t even need to put nuts on the back of the bolts, screws into the bracket just fine without.


Sketched  and printed in no time!

Hairy beast!

We looked on eBay for fur for the creature. We then toured local fabric and craft shops. Then we found this long orange fur. It really struck us this would catch peoples attention as they walked by. So we bought it.


Our creation all of a sudden is looking nearly finished.

It needs some foam to shape it and make it more rounded so some large car sponges should do that for the top and sides.

Holding the paper down.. problem solved!

Since the platform idea evolved, I’ve struggled with many ideas of how to hold the paper down into place when the visitor closes the drawer.

It is essential the picture is held in EXACTLY the correct place on the platform and that the closing of the drawer does not cause the picture to waft off the platform. I have had many ideas of hinged contraptions and glass plates etc. While washing up I noticed my collection of neodymium magnets stuck to the metal beading under the plasterwork of the window. From no where inspiration.

See my idea below, I’m embedding the magnets into the frame. The magnets are dangerous if swallowed, so I must protected the young visitors from them. The 3D print pauses, I put the magnet inside and i end up with a frame that contains magnets.

I then drill out four holes in the platform, wood glue more magnets into the platform, sand and paint. I now can snap the frame onto the base with the paper trapped between! – Simple is always better than elaborate contraptions like I was originally thinking.

And here it is finished.

Controlling the eyes

I printed a base for the Arduino Uno as shown above, and screwed it into the box. It was then rigged up to animate the eyes. I linked the Uno to the RPi via I2C so that the RPi could command the eyes to do sequences as a show controller. The idea is that as it scans or similar, the eyes respond to what is going on.