but plenty for an Arduino Nano. So far functionality for three of the four buttons on this speaker has been preserved: power, volume up, and volume down. The fourth button initiates Bluetooth ...

Bluetooth LE is good enough for short-range ... A small, cheap board was needed that could be powered by a LiPo battery, and [Micah] created a board that fit his needs perfectly.

Read more: Battery Brands Ranked From Worst To Best ... from beginner projects like an Arduino-powered automatic plant watering system to more complex applications like a self-balancing mobile ...