Speaking of wireless control mode, it is closely related to the development of wireless technology.
With the rapid development of science and technology, wireless technology is also making rapid progress.
Basically, when a new wireless technology appears, smart wireless products immediately follow.
The characteristics of
Flexible application, no wiring, good scalability, easy to move, etc.
Common wireless technologies mainly include
Infrared, Bluetooth, RFID, ZigBee, WIFI, cellular mobile, etc.
First, infrared technology
Infrared transmission is currently the most widely used means of communication and remote control.
Infrared remote control device has the characteristics of small volume, low power consumption and low cost.
Now household TV, air conditioning and other appliances are basically the use of infrared remote control technology.
Infrared detection technology is divided into active infrared detection and passive infrared detection.
These two kinds of infrared detection technology have different application ways in smart home.
Active infrared detection is to send one or more parallel infrared beams modulated by the infrared emitter, which are received by the infrared receiver and converted into digital signals and sent to the alarm controller. If there are obstacles in the transmission range, the alarm will be triggered.
Active infrared detection is widely used in home alarm system. For example, a pair of infrared transmitters and receivers on either side of the window will alert you immediately if anything passes through.
Infrared transmission can be used for data transmission between household appliances, such as audio transmission. The biggest advantage of wireless infrared technology is the large bandwidth, even more than other mainstream wireless technology.
This means that audio products using infrared wireless technology can transmit large volumes of audio signals without compression, while operating in a higher bit rate format.
Second, WIFI technology
WiFi is a technology that wirelessly connects personal computers and handheld devices (mobile phones, tablets, etc.) to each other.
WiFi, commonly known as wireless broadband, is a short-range wireless communication technology that can support radio signals for Internet access over a range of hundreds of feet.
The main advantages of WiFi technology are:
First, the coverage of radio waves is wide, with a radius up to 100m, so let alone an office of dozens of square meters, or even a building of dozens of meters high, can cover all of them.
Second, the transmission speed is very fast, which can reach 11Mbps.
Although WiFi technology has been very advanced, there are few large-scale commercial applications based on WiFi technology.
Why?
First, large operators do not recognize this model;
Second, the lack of effective business model.
ZigBee technology
ZigBee technology, the most popular wireless technology in the smart home industry, is a two-way wireless communication technology with short distance, low complexity, low power consumption, low speed and low cost. It is mainly used for the occasion of short distance, low power consumption and low data transmission rate.
Simply put, ZigBee is a highly reliable wireless data transmission network, similar to CDMA and GSM networks.
The communication distance of ZigBee data transmission module is generally hundreds of meters, but can also reach several kilometers, and supports wireless expansion.
At present, the general wireless smart home system is based on 315M/433M radio one-way data transmission, because there is no response from the receiver, these wireless smart home in the case of interference will appear control failure, system reliability is very poor.
The wireless intelligent home system using ZigBee standard can completely solve the fatal defect of control failure.
It is based on this advantage that ZigBee technology has become the most popular wireless transmission technology in the smart home industry.
Iv. Cellular Mobile (3G/4G/5G)
Cellular mobile networks are entrenched in the consumer market, providing reliable broadband communications and supporting a variety of voice calling and streaming video applications.
On the downside, they bring very high operating costs and power demand.
While cellular mobile networks are not suitable for most battery-powered sensor iot applications, they are well suited to specific usage scenarios, such as connected cars or fleet management in transportation and logistics.
In addition, things like in-vehicle infotainment systems, traffic routes, advanced Driver Assistance systems (ADAS), and fleet telematics and tracking services can all rely on ubiquitous high-bandwidth cellular mobile networks.
5G, the next-generation mobile network with high speed and ultra-low latency, will be the future of self-driving cars and augmented reality (VR).
5G is also expected to enable real-time video surveillance for public safety, real-time mobile transmission of medical data sets for connected health, and some time-sensitive industrial automation applications.
5. Bluetooth and BLE
Bluetooth, which belongs to the category of personal wireless networks, is a short-range communication technology well positioned in the consumer market. The new Bluetooth low power, due to its low power characteristics, further optimizes consumer iot applications.
BLE enabled devices are used primarily in conjunction with electronic devices (typically smartphones) that act as hubs for transferring data to the cloud. BLE is now widely integrated into fitness and medical wearables (e.g., smartwatches, glucose meters, pulse oximeters, etc.) as well as smart home devices (e.g., door locks) through which data can be easily transferred to and visualized on smartphones. In a retail environment, BLE can be combined with beacon technology to enhance customer services such as in-store navigation, personalized promotions, and content delivery.
Six, RFID
Radio frequency identification (RFID) uses radio waves to transmit small amounts of data from an RFID tag to a reader over a short distance.
To date, the technology has driven major revolutions in retail and logistics.
By attaching RFID tags to a variety of products and equipment, companies can track their inventories and assets in real time, leading to better inventory and production planning and optimized supply chain management.
As iot applications continue to increase, RFID continues to consolidate its position in retail, which in turn enables iot applications such as smart shelves, self-checkout and smart mirrors.
To sum up, each vertical domain and application has its own unique network requirements.
Choosing a premium wireless technology for your iot use case means exacting standards in terms of range, bandwidth, quality of service, security, power consumption, and network management