Refining the Space Rock shapes

First refined version of shape 4. The outer shell has been sanded ready to be cast (as a test). And some test prints in PLA of the inner part that holds the power bank and circuit board. The first version of this is not deep enough and the screw holes are a little too close to the edge of the print.

Glow-in-the-dark Space Rocks

Small (45mm) 3D printed Space Rocks, that glow in the dark.

First attempt at mould-making with silicone and casting in Jesmonite

A small test, mould-making from the lumpy Space Rocks created using Meshmixer, plus the resulting Jesmonite cast.

Getting the Space Rocks to talk to each other

Configuring the XBees.

Am using the Digi XBee wireless connectivity kit to allow the Space Rocks to communicate with each other. Following the tutorials on Sparkfun, I have managed to get them talking via X-CTU. Which is a good start.

XBee 1 talking
XBee 1 talking
XBee 2 talking
XBee 2 talking


And these two are also now communicating with each other.

XBee communicating with Arduino shield
XBee communicating with Arduino shield

And inside the plastic shells, at a distance of about 5 feet apart.

Arduino – Mozzi Piezo input tests

“A piezo creates a varying voltage when you squeeze it. [We’ll] use it as a sensor by measuring the voltage the piezo produces across a 1 megaOhm resistor…Notice it has a very fast response, especially a sharp attack and decay when it’s knocked.”

This first test was changing the frequency as the piezo was scraped and touched.

And the audio version:


Piezo sample trigger (& speed)


Piezo sample scrub

And finally an example of an external speaker circuit. Will need to work on the output level for this.

Arduino audio – further Mozzi tests

A video showing an Arduino Nano running the Mozzi library, which allows sounds generated from sensors. This uses the LDR + resistor as input to Analog Pins A1 +  A2, and using the code from Arduino➞File➞Examples➞Mozzi➞03.Sensors➞Knob_LightLevel_x2_FMsynth

And here’s the attendant audio.