A category of powered LEGO products which offer direct and remote control of action bricks.

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What electrical contact material is used for PF Connectors?

I'm designing my own PF electrical connector and I want to have the same functional characteristics as the original Lego brick. Could you please let me know which electrical contact material is ...
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At what voltage do the c1 and c2 lines run at when controlling a lego servo motor?

related: how to control a servo motor from a raspberry pi The raspberry Pi normally outputs 3.3 V signals from it's pins, however there are logic level converters for interfacing with higher-voltage ...