Everyone who is older than 18 know what the Bluetooth is and used it several times. Nowadays, this wireless transmission solution is implemented in every mobile phone. It can be used for data exchange between devices or voice between our mobile and headset. What is the range if Bluetooth device? It depend on its class:

  • class 1 (100 mW) – has the longest range, theoretically 100 m (in practice it is about 25 m),
  • class 2 (2.5 mW) – it is the most popular class with the range up to 10 m,
  • class 3 (1 mW) – rarely used with the theoretical range up to 1 m.

I have mentioned about the basic application of Bluetooth. What else can be it used? It is used e.g. in wireless mouses and keyboards. However, it is perfect for wearable devices e.g. it can provide connectivity between an intelligent watch and a smartphone. Also, components of an intelligent home can use this technique. Thermostats, LED lamps or remote controlled power outlet are connected to the master central via WiFi. However it could be Bluetooth.

Let’s see what the next versions of the Bluetooth protocol are:

  • Bluetooth 1.0 – 21 kbps
  • Bluetooth 1.1 – 124 kbps
  • Bluetooth 1.2 – 328 kbps
  • Bluetooth 2.0 + EDR – introduction of Enhanced Data Rate improved the theoretical throughput up to 2,1 Mbps
  • Bluetooth 3.0 + HS (High Speed) – 24 Mbps (3 MBps)
  • Bluetooth 3.1 + HS (High Speed) – 40 Mbps (5 MBps)
  • Bluetooth 4.0 + LE (Low Energy) – 1 Mbps with very low power consumption and long range (up to 100 m). It is dedicated for sensor applications.

You should remember about one very important thing. Bluetooth can interfere your WiFi network, because it operates at the same frequency band!