Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE) female and seems to work OK

and seems to work OK on Uno but may not work on other Arduinos

3x - SPDT slide switches

While not specifically designed for Pi Model A or B

That's why Ytai added a temperature cut-off

instead of continuously charging/draining the battery

Adafruit Bluefruit LE SPI Friend - Bluetooth Low Energy (BLE) female and seems to work OKAdd powerful and easy to use Bluetooth Low Energy to your robot, art or other electronics project! With BLE now included in modern smart phones and tablets, its fun to add wireless connectivity. So what you really need is the new Adafruit Bluefruit LE SPI Friend! The Bluefruit LE SPI Friend makes it easy to add Bluetooth Low Energy connectivity to anything with 4 or 5 GPIO pins. With SPI, you don't have to worry about baud rates, flow control, or