Speaking of wireless control methods, it is closely related to the development of wireless technology.
With the rapid development of technology, wireless technology has also made rapid progress.
Basically a new wireless technology appears, and smart wireless products will follow up immediately.
Features
Flexible application, no wiring, good scalability, convenient movement, etc.
Common wireless technologies mainly include
Infrared, Bluetooth, RFID, ZigBee, WIFI, cellular mobile, etc.
1. Infrared technology
The most widely used communication and remote control technology infrared transmission is currently the most widely used communication and remote control method.
The infrared remote control device has the characteristics of small size, low power consumption and low cost.
Infrared remote control technology is basically used on household TVs and air conditioners.
Infrared detection technology is divided into active infrared detection and passive infrared detection.
These two types of infrared detection technologies have different applications in smart homes.
Active infrared detection is to send out one or more modulated parallel infrared beams through an infrared transmitter, which is received by the infrared receiver and converted into a digital signal and sent to the alarm controller. If there is an obstacle in the transmission area, it will be triggered Call the police.
Active infrared detection is widely used in home alarm systems. For example, install a pair of infrared transmitters and receivers on both sides of the window, if an object passes through, it will immediately alarm.
Infrared transmission can be applied to data transmission between household appliances, such as audio transmission. The biggest advantage of wireless infrared technology is its large bandwidth, even exceeding that of several other mainstream wireless technologies.
This means that audio products using infrared wireless technology can transmit large-capacity audio signals without compression, and can run in higher bit rate formats.
2. WIFI technology
Short-range wireless transmission technology WiFi is a technology that can wirelessly connect terminals such as 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 within a range of hundreds of feet.
The main advantages of WiFi technology are:
First, the radio wave covers a wide range, with a radius of up to 100m, so not to mention an office of tens of square meters, or even a building of tens of meters high.
Second, the transmission speed is very fast, up to 11Mbps.
Although WiFi technology is already very advanced, there are few large-scale commercial applications based on WiFi technology.
What's the reason?
First, large operators do not recognize this model;
Second, it lacks an effective business model.
Three, ZigBee technology
The most popular wireless technology in the smart home industry, ZigBee technology is a short-distance, low-complexity, low-power, low-rate, and low-cost two-way wireless communication technology. It is mainly used for short distances, low power consumption, and low data transmission rates. High occasions.
Simply put, ZigBee is a highly reliable wireless data transmission network, similar to CDMA and GSM networks.
The communication distance of ZigBee digital transmission module is generally several hundred meters, but it can also reach several kilometers, and it supports wireless expansion.
At present, the general wireless smart home system is based on 315M/433M radio frequency one-way data transmission. Because there is no receiving response from the receiver, these wireless smart homes will have control failures under interference, and the system reliability is very poor.
The wireless smart home system using the ZigBee standard can completely solve the fatal flaw 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.
Fourth, cellular mobile (3G/4G/5G)
Cellular mobile networks are deeply entrenched in the consumer market, providing reliable broadband communications and supporting various voice calls and streaming video applications.
The downside is that they will bring very high operating costs and power demand.
Although cellular mobile networks are not suitable for most battery-powered sensor IoT applications, they are well suited for specific use cases, such as connected cars or fleet management in transportation and logistics.
In addition, in-vehicle infotainment systems, traffic routes, advanced driver assistance systems (ADAS), and fleet telematics and tracking services can all rely on the ubiquitous high-bandwidth cellular mobile network.
The next-generation mobile network 5G with high speed and ultra-low latency will become the future of autonomous vehicles and augmented reality (VR).
It is expected that 5G will also 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.
Five, Bluetooth and BLE
Bluetooth belongs to the category of personal wireless networks, and is a short-distance communication technology well positioned in the consumer market. The new Bluetooth Low Energy, due to its low power consumption characteristics, further optimizes consumer IoT applications.
Devices that support BLE are mainly used in conjunction with electronic devices (usually smart phones), which act as hubs for data transmission to the cloud. Nowadays, BLE is widely integrated in fitness and medical wearable devices (such as smart watches, blood glucose meters, pulse oximeters, etc.) and smart home devices (such as door locks). Through these devices, data can be easily transmitted to smart phones. And visualize it on a smartphone. 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 a small amount of data from a radio frequency identification tag to a reader within a short distance.
So far, this technology has promoted a major revolution in the retail industry and logistics.
By attaching radio frequency identification tags to various products and equipment, companies can track their inventory and assets in real time, thereby achieving better inventory and production planning and optimized supply chain management.
With the continuous increase of Internet of Things applications, RFID continues to consolidate its position in the retail industry, making possible Internet of Things applications such as smart shelves, self-checkout, and smart mirrors.
In summary, each vertical field and application has its own unique network requirements.
Choosing high-quality wireless technology for your IoT use case means accurately weighing standards in terms of range, bandwidth, quality of service, security, power consumption, and network management.