Description
The material used in PCB from top to bottom includes Silkscreen, Soldermask, Copper and Substrate. The last of those layers, substrate, is made of fiberglass and is also known as FR4, with the FR letters standing for “fire retardant.”







Keypad - 4x4
Mechanzo 5+ Kit
LEDs - Blue
Mechanzo 6+
Wemos D1 R2
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