Raspberry Pi multi quad case
thingiverse
This is a job that requires four Raspberry Pi or Tinkerboard units. Inside, there's space for a power supply unit. On the side, you'll find holes for a main switch and four individual switches to turn things on or off. The switches I purchased from www.conrad.de can be seen in this example: https://www.conrad.com/de/kaltgeraete-steckverbinder-c8-stecker-einbau-horizontal-gesamtpolzahl-2-25-a-schwarz-c8-1-st-1572265
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