Alex- Small PCB with castellated Holes on the corners to fit inside of the four Pins of the Header
- Ultra tiny discrete RGB LED
- BGA Microcontroller ATtiny20-UU or similar
- 0402 passive are to big - 01005 does fit but not many
- Black header Plastic shroud does looks big and bulky in this context. Maybe there are Header with less - or just remove it
- Could be fun to assemble and manufacture this
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