Bluetooth technology is named after the Scandinavian king Harald "Bluetooth," who unified the Danish tribes in the 10th century. The founding companies behind the technology (mostly from Nordic countries) chose the name to honor his role in unification, symbolizing the technology's goal of uniting different types of devices under one connectivity standard.
How the technology works
Bluetooth is a wireless communication standard that lets devices exchange data without cables, relying on radio waves at a 2.45 GHz frequency — an internationally agreed frequency band for industrial, scientific, and medical equipment.
How pairing works
When two Bluetooth-equipped devices come close to each other, an automatic "electronic handshake" takes place to determine whether there's data to exchange or whether one device should control the other, with no manual intervention needed after the initial pairing. This mechanism creates a small personal network that doesn't extend beyond a single room or less, with automatic frequency coordination between devices to avoid interference.
Bluetooth and Arduino-based home control
By connecting a Bluetooth module to an Arduino board, you can control any home electrical appliance with just a tap on a smartphone app button, with no wires needed between the phone and the control board. The Bluetooth-based home appliance control project covered earlier demonstrates this principle step by step.
You can find Bluetooth modules compatible with Arduino at Juthour Tech.
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