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Communication technology is the most concerned topic in the Internet of Things industry in the past few years. It is in the core of the Internet of Things industry, and it is irreplaceable. It plays a role of connecting up and down, and can connect sensors and other products upwards. Product and industry applications. In addition, communication technology as a basic technology is very important for IoT products and solutions. At present, the homogenization of hardware product functions is a very common phenomenon. For example, the hot smart bracelet products on the market are similar in function. Hard to be competitive. The status of communication technology in the Internet of Things industry can be described as important.
So in the Internet of Things communication technology, which wireless technology is more widely used, today I will check with you.
1, Bluetooth Blue Tooth
Bluetooth Blue Tooth is generally used for close-range data exchange and currently plays an important role in the field of wearable smart products, smart medical electronics and smart home. The Bluetooth function we usually use can only transmit data within a short distance (about 10M). The power consumption is relatively large, and the range of use has certain limitations.
2, Purple Bee ZigBee
ZigBee is a low-power, short-range wireless communication technology, and the data transmission module is similar to a mobile network base station. In practical applications, it has been found that although Bluetooth technology has many advantages, there are still limitations of the application. For industrial production, smart home and telemetry and remote control, Bluetooth technology is more complicated, not only has large power consumption, short distance, but also has a small networking scale. The advent of the ZigBee protocol of the Purple Bee just makes up for these shortcomings.
3, RF RF
Radio Frequency Radio Frequency (RF) is a kind of electromagnetic wave with high frequency alternating current. The radio frequency system is composed of three parts: tag (radio card), antenna and reader. The commonly used access card, canteen card and bus card are all RF communication system devices.
4, Wi-Fi
Wi-Fi is very common in our lives, with wireless networks in almost all public places in first-tier cities, due to its low cost and transmission characteristics. Wi-Fi is a technology that allows electronic devices to connect to a wireless LAN. It typically uses a 2.4G UHF or 5G SHF ISM RF band. Connection to a wireless LAN is usually password protected; but it can also be open, allowing for any Devices within the WLAN range can be connected.
Since the frequency band of the wireless network does not require any telecommunications operation license worldwide, the WLAN wireless device provides a wireless air interface that can be used worldwide, which is extremely inexpensive and has a very high data bandwidth. Users can quickly browse the webpage in the Wi-Fi coverage area and receive calls anytime, anywhere. With Wi-Fi, we can make long distance calls, browse the web, send and receive emails, download music, digital photos, etc., without worrying about slow speed. And the problem of high cost.
Wireless networks are becoming more widely used on handheld devices, and smartphones are part of it. Unlike the Bluetooth technology that was applied to mobile phones earlier, Wi-Fi has greater coverage and higher transmission rates, so Wi-Fi mobile phones have become the fashion trend of the mobile communication industry in 2010.
5, NFC
NFC is an emerging technology. Devices using NFC technology can exchange data in close proximity to each other. It is evolved from the integration of contactless radio frequency identification (RFID) and interconnection technology through a single chip. Integrated inductive card reader, inductive card and point-to-point communication, using mobile terminals for mobile payment, access control, identity recognition and other applications.
Inventory of the Internet of Things throat - common communication technology
6, LoRa
LoRa is one of the LPWAN communication technologies. It was born in August 2013 and is an ultra-long-range wireless transmission scheme based on spread spectrum technology adopted and promoted by Semtech. This solution changes the previous compromise between transmission distance and power consumption, providing users with a simple system that can achieve long distance, long battery life (3-5 years), large capacity, and thus expand the sensor network. . Currently, LoRa operates mainly in free frequency bands around the world, including 433, 868, and 915 MHz.
7, NB-IoT
Cellular-based Narrow Band Internet of Things (NB-IoT) is built on a cellular network and consumes only about 180 kHz of bandwidth. It can be deployed directly on GSM networks, UMTS networks or LTE networks, supporting low-power devices in the WAN. The cellular data connection, also known as Low Power Wide Area Network (LPWA). NB-IoT supports efficient connection of devices with long standby time and high network connection requirements. The battery life of the NB-IoT device is said to increase to at least 10 years while providing a very comprehensive indoor cellular data connection coverage.
8, IPv6/6Lowpan
IPv6-based low-speed wireless personal area network standard, namely IPv6 over IEEE 802.15.4. The IEEE 802.15.4 standard is designed to develop compact low-power, inexpensive embedded devices (such as sensors) that can run on batteries for one to five years. The standard uses a radio transceiver operating in the 2.4 GHz band to transmit information using the same frequency band as Wi-Fi, but its RF transmit power is only about 1% of Wi-Fi. The emergence of 6LoWPAN enables various low-power wireless devices to join the IP home, and is connected to Wi-Fi, Ethernet and other types of devices; IETF 6LoWPAN technology has the characteristics of wireless low-power, self-organizing network, is the Internet of Things perception Layers, important technologies of wireless sensor networks, ZEPBee's new generation of smart grid standards SEP2.0 has adopted 6LoWPAN technology, with the deployment of the US smart grid, 6LoWPAN will become the de facto standard, a comprehensive replacement for the ZigBee standard.
9, RF433/315M
The wireless transceiver module adopts radio frequency technology and works in the ISM frequency band (433/315MHz). It generally includes a transmitter and a receiver. It has high frequency stability and good harmonic suppression. The data transmission rate is 1K~128Kbps, and the modulation mode of GFSK is adopted. With superior anti-interference ability. Applications: (1) Wireless meter reading system (2) Wireless street light control system (3) Railway communication (4) Model wireless remote control (5) Wireless security alarm (6) Home appliance control (7) Industrial wireless data collection (8) Wireless data transmission. The low-power RF433 can operate in the voltage range of 2.1-3.6V. In the 1SEC cycle polling mode, the charging mode consumes less than 20uA, and a 3.6V/3.6A lithium-ion battery can be used. Work for more than 10 years.
10, Z-Wave
It is a radio-based, low-cost, low-power, high-reliability, network-suitable short-range wireless communication technology led by Danish company Zensys. The operating frequency band is 908.42MHz (USA) ~ 868.42MHz (Europe), using FSK (BFSK/GFSK) modulation mode, data transmission rate is 9.6 kb ~ 40kb / s, the effective coverage of the signal is 30m indoors, outdoor can exceed 100m, suitable for narrow broadband applications. Z-Wave uses dynamic routing technology. Each Z-Wave network has its own independent network address (HomeID); the address (NodeID) of each node in the network is assigned by the control node (Controller). Each network can accommodate up to 232 nodes (Slave), including control nodes. Zensys provides a Dynamically Linked Library (DLL) for Windows development. The developer uses the API functions in the DLL for PC software design. The wireless network built by Z-Wave technology can not only remotely control home appliances through the network equipment, but also control devices in the Z-Wave network through the Internet.
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