blink(inch)

I came back from holiday vacation to discover a Shapeways box waiting on the doorstep. Inside I found two copies of the 3d printed cube enclosure, which came out looking nice, fit together well, and let enough light through to show up in sunlight.

The light is a little unbalanced in the corner but that's more an issue with the LED placement than the cube itself.

Starting with a fork of the ATTinyTemp enclosure i created a rounded cube enclosure for the blink(inch) in OpenSCAD. It is just a bit larger than an inch^3, and thanks to the original parametric design the only real effort went into making sure the hole for the USB plug was the right size.

To test the circuit I used the HID mouse wiggling example from http://codeandlife.com/2012/02/11/v-usb-tutorial-continued-hid-mouse/ . I've had troubles with enumeration before with V-USB and ATTiny85 but having the 3.6V zener diodes seems to mitigate that -- it enumerated on the first try.

I also ran a non-USB color fading test with pleasant results

The design files are now in this repo: https://github.com/spro/blinkinch. It includes the Eagle schematic and board files plus a .zip of gerber and drill files

While I wait for the PCBs to arrive from OSHPark I'll use an equivalent breadboard to start developing the firmware and driver.

My current conception of the driver exposes a service with a single method:

setRGB(r, g, b, message=null)