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This is my attempt at a modular robot head running a raspberry pi a pair of web-cams and servos the modular part is the db25(parallel plug) connector to the neck/body that has connections to the battery and balance wires for external charging, Ethernet and other auxiliary pins that are unused so far (ribbon cable from the pi). This connector will have a matching connector on the body/neck of the robot and also a set of separate breakout cables for debugging on my desk when disconnected ...
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/robots/show/small-robot-head-mk2