One ring to rule them all — or at least manage all of your incoming smartphone alerts. That's the idea behind Smarty Ring, a Bluetooth-enabled wearable gadget that allows users to check smartphone alerts and manage incoming calls right from their finger.
Hacking Electronics: An Illustrated DIY Guide for Makers and Hobbyists by Simon Monk. Who needs an electrical engineering degree? This intuitive guide shows how to wire, disassemble, tweak, and re-purpose everyday devices quickly and easily.