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These are the components I used, but you should be able to find alternatives for most of them if necessary.

  • SparkFun Pro Micro (5V, 16MHz)
  • 64 photoresistors
  • 72 diodes
  • Shift register
  • 8 resistors
  • Cables and soldering supplies

For potential alternatives, see Design decisions.


The electronics used in this project cost me around 35€, divided as follows:

Part Price
Pro micro 10€
Photoresistors 13€ (for 350 pcs)
Shift register 1€
Cables, diodes, etc. ~10€

This is significantly cheaper than commercial alternatives, which cost several hundred Euros.

Circuit board

Fritzing file


Copyright © 2021 Philipp Leclercq. Licensed under GPLv3.