Starry sky

Submitted by robert on Wed, 08/01/2018 - 14:33
Beginning
Layout

For my sister's birthday I had the idea to create a starry sky, with flickering stars and a real layout of the constellation Scorpius.

I started by printing an image of the constellation and surrounding stars at nine pages, I wanted the starry sky to be about 1 m by 1 m. Made an error when printing so the actual sky is smaller than the MDF board I bought.

Then came the 'fun' part... drilling all the holes. I used three different drill sizes for the different sizes of the stars. I used my Proxxon TBM 220 with the head shifted to the side.

On the back I made the holes a bit clearer by using a bigger drill, plus I wrote the two largest sizes next to it.

I bought some cheap paint, primer and matte black. It takes quite a lot of that paint (spray can), not completely satisfied about all of it, but can't change it anymore.

 

The electric part is build around an Arduino Nano and I2C IO Expander. The Arduino will flicker the different leds with hardware pwm and software pwm.

Part of the stars will be static and not flickering, because that would be too much.

The leds are connected to the board with three sizes plastic fibers which fit through the holes.

PCB

Pictures will follow, this it just... rotated etc.