Bluetooth Shield

Adds Bluetooth serial communication so an Arduino can exchange data with a phone, tablet or laptop without cables. Once paired, it behaves exactly like a wired serial port, so existing Serial.print and Serial.read code works unchanged. The most common use is a phone app that controls a robot or reads sensor values. Note that classic Bluetooth serial pairs easily with Android and Windows but not with iPhone, which requires a BLE module instead. Wireless serial link with no code changes needed; Pairs with Android phones and Windows laptops; Onboard switch to keep USB programming free; Adjustable baud rate via AT commands