Matt writes -
Build instructions for the ‘Baby Interface Device’ (BID), an ultra-simple USB Human Interface Device for Tiny Humans. Built to allow my kid to interact with the computer without destroying my keyboards. The BID is a DIY USB HID (Human Interface Device) that acts as a keyboard to trigger a single keypress (space bar in this case). The concept is to create a very large button that is baby-friendly to allow an infant to interact with computer games and educational software.
The project can be assembled in less than an hour for around $35 or less and requires very little knowledge of electronics or coding.