ZigBee module. ZigBee, also known as “purple bee”, is a LAN protocol based on IEEE802.15.4 standard. The frequency band is 2.4GHz. It is characterized by short distance, simple application, self-organized communication, low power consumption, high security, low cost, etc. Due to the support of automatic networking, at least one coordinator and one router are needed, which are mainly suitable for automatic control, remote control, various smart home and so on.
WIFI。 WiFi technology is also a short-range wireless transmission technology. The standards adopted are IEEE802.11a and IEEE802.11b. The frequency band is generally 2.4GHz, and the transmission distance is generally about 100m. The networking mode is relatively uncomplicated. The wireless network composed of AP and wireless network card is enough. At present, WiFi is used in many hotels, restaurants, libraries, office buildings and families, It can be connected to the Internet only by carrying the terminal supporting WiFi. At the same time, it is also used in smart home control, such as TV, air conditioner, lamps, curtains, etc.
Bluetooth。 Bluetooth is also a wireless technology standard. The band is about 2.4GHz, and the communication distance is generally less than 100m. Bluetooth is mainly used for portable devices, such as various instruments, smart home, sports measurement, automotive electronics, leisure toys, mobile phone peripherals, data acquisition system, etc.