2 layers25 × 37.3 mm
TheLock schematics
bitraf/toollock
Each lock has a key with a matching key pattern. The key is physically attached to the tool using a wire. An optical sensor detects that the right key is used.
14 parts
Msgflo
1 boardsKiCad boards from 1 GitHub repository tagged “msgflo”, the most starred first; open any of them in PCBKit.