Many people are envious of smart home life, but because they live in old houses, many wirings are not considered, so I don't know how to achieve this smart life. In fact, another smart home technology that we are going to talk about today, home radio frequency technology, should be designed for homes that have been renovated but not pre-wired.
This is the difference between wired and wireless networks mentioned in our home network. Wireless network technology can also set up a home LAN without wiring. The radio frequency technology is a point-to-point transmission of high-frequency wireless frequencies (315 or 433.92 MHz) to realize remote control functions of lights, curtains, and home appliances. This kind of technology is very suitable for users who have already been renovated, without pre-wiring, and will not damage the beauty of the original home.
Using products based on radio frequency technology, we can connect all the appliances in the home into a network. We call it a smart home wireless network. In this network, we can remotely control and let every cold electric appliance obey us. .
How to let home appliances take orders from us?
There are many electrical appliances in the home, lighting, refrigerators, air conditioners, computers, home theaters... Some of them have remote control capabilities, such as air conditioners, TV sets... some do not have remote control functions, such as water heaters, microwave ovens, rice cookers, The refrigerator...and the different remote control devices have different remote controls, which are not universal with each other, so there are four or five light remote controls at home. So how do you remotely control a device that does not have a remote control function and how to make a remote control implement multiple remote control functions? From the above introduction, we know that products based on radio frequency technology can help us solve these problems, but they are How to achieve it?
The smart home wireless network mainly includes a home gateway and several wireless communication sub-nodes. There is a wireless transmitting module on the home gateway, and each child node is connected with a wireless network receiving module. Through these wireless network transceiver modules, data is transmitted between the gateway and the child nodes.
2. Radio frequency wireless communication sub-node
In different control systems, the wireless communication sub-nodes have different functions:
Taking a 200-square-meter house as an example, the indoor length is more than 30 meters. Therefore, with the coverage of 100 meters, the user can receive the command of the remote control no matter where the user goes, and the lighting can always match your pace. Each remote control, switch or dimmer switch is equipped with a wireless RF transmitter or receiver, so the remote control can directly issue commands to each switch to control the preset lighting conditions without any wires being connected. However, the indoor remote control distance of 30m is already the maximum limit of wireless radio frequency technology. If this distance is exceeded, the wireless signal is susceptible to co-channel interference and the signal is weakened, which is also the biggest defect of radio frequency technology.
Radio frequency control scheme
Lighting control
The wireless RF lighting control system consists of a smart panel switch and a dimmer that sends and receives command signals that are transmitted over the air rather than through the home's power line. Each panel switch is equipped with a different remote identification code. These codes utilize 19-bit identification technology to enable the receiver to accurately identify each instruction. Even if the neighbors use them at the same time, there will be no transmission errors due to interference from their remote controls.
The dimmer switch also has an RF radio transmitter built in. It can control the floor lamp or table lamp switch or adjust the brightness of the light independently of the remote control or moving switch. The back of the dimmer switch is also equipped with a clip that can be freely clamped to the wire or other conspicuous places, which is not easy to lose and flexible. Reduce interference, transmit or receive commands more accurately.
2. Wireless smart socket
The wireless smart socket series mainly realizes the remote control of non-remote control appliances (such as water heaters, electric fans, etc.) through wireless radio frequency technology, which not only adds wireless remote control functions to these electrical appliances, but also maximizes energy conservation and safety.
3. Scene remote control mode
A scene mode is a specific lighting environment that can be pre-set and restored. It achieves a specific lighting environment by locking the switch of a light and the brightness of the light. For example: the full closure of the lights, the night environment, the entertainment environment, etc. when leaving home or sleeping. The scene remote control not only controls a single switch and socket, but also controls the entire lighting environment in the home.
4. Information appliance control
Information Appliance Control is a multi-function remote control system that integrates infrared control and wireless control. It can control up to five infrared devices (such as: TVs, air conditioners, DVDs, amplifiers, curtains, etc.) and wireless devices such as switches and sockets. The information appliance control system is mainly composed of an information appliance controller and various intelligent remote control switches. The information appliance controller can transfer the code of the remote control of the ordinary infrared appliance through the learning method to replace the original home appliance remote controller. At the same time, it is also a wireless remote control, which can transmit the control signal of 433.92MHz frequency, so it can control the intelligent switch, smart socket and wireless infrared transponder in this frequency band.
How does the information appliance controller realize remote control of the air conditioner?
The infrared code of the air conditioner is quite different from the infrared code of other home appliances. The infrared code corresponding to each button on the air conditioner remote controller is not fixed. For example, pressing a button with an increase or decrease in temperature does not simply send a fixed temperature increase or decrease of the infrared code, but sends a code of the current working state to the air conditioner (how much does the code contain the current air conditioner? Still heating? What is the wind speed? What is the angle of the wind?). Therefore, the information appliance remote control can not simply learn a few buttons on the air conditioner remote control to achieve complete control of the air conditioner. The user can only control the air conditioner by learning the working status of the air conditioner.
5. Telephone remote control
The telephone remote control system mainly realizes the control of infrared appliances (mainly air conditioners) and wireless switches and sockets in the home by making telephone calls. It can be set directly through the telephone connected to the telephone controller, or it can be accessed by telephone; the telephone controller can control the lights, sockets and air conditioners in the living room, study and bedroom.
Let's take a look at a real-life case to see which wireless RF products are needed to complete some smart solutions.
1. House type
Three rooms and two halls: master bedroom, second bedroom, study room, living room, dining room.
2. The functions implemented
Home smart appliances, lighting systems; remote intelligent control appliance system (telephone, network); home security system; video intercom system.
3. System structure diagram
The two left vertical dotted lines in the figure indicate the infrared remote control signal; the other dotted lines indicate the RF remote control signal; the solid black line with the arrow is the security signal; the direction of the arrow is the signal transmission direction. In this picture, we mainly focus on the family part, and the community part is used for the overall community project.
4. Products used
â—Intelligent gateway
A home security function
Provide 14 channels of wired zone access, 2 channels of output; wireless disarming, emergency help and other functions; telephone and network for arming, with linkage control.
B video intercom (optional)
Through the connection with the door machine, the video intercom and unlock between the user and the visitor are realized.
C telephone remote control
The intelligent gateway is embedded in the telephone voice module, and realizes the telephone alarm function through the telephone line of the user; the security operation such as remote arming can be performed through the gateway telephone voice module; and the remote telephone control is performed on the home appliance and the lighting system.
D network remote control
Remote network control of home appliances, lights, sockets and security detectors in the home through the network; remote security disarming, alarm elimination, alarm inquiry and other functions in the home security system.
E home voice message
Record a voice message.
F mail service
Email sending and receiving function.
â—Information appliance controller
Realize all local remote control operations in the home, and directly control the code with smart sockets, switches, DVD remote control, TV remote control, curtain controller, etc. It is a multi-function remote control in the true sense.
â—Other remote control
Including scene remote control, mini scene remote control and enhanced scene remote control, it can achieve single control of lighting and different scene combination control.
â—Smart switch, socket
Works with the remote control to achieve intelligent control of the lighting effect.
Radio frequency technology
Radio frequency technology is a short-range, low-complexity, low-power, low-data-rate, low-cost wireless communication technology. The advantage of this technology is that some products do not need to be re-routed, and use point-to-point RF technology to realize the control of home appliances and lighting, and the installation and setting are relatively convenient, mainly used to realize the control of certain specific appliances or lights, and the cost is moderate. This type of system has weak functions, a relatively simple control method, and is susceptible to interference and shielding from surrounding wireless equipment environments, especially the same frequency and obstruction; it is more suitable for newly renovated households and renovated households.This is the difference between wired and wireless networks mentioned in our home network. Wireless network technology can also set up a home LAN without wiring. The radio frequency technology is a point-to-point transmission of high-frequency wireless frequencies (315 or 433.92 MHz) to realize remote control functions of lights, curtains, and home appliances. This kind of technology is very suitable for users who have already been renovated, without pre-wiring, and will not damage the beauty of the original home.
Using products based on radio frequency technology, we can connect all the appliances in the home into a network. We call it a smart home wireless network. In this network, we can remotely control and let every cold electric appliance obey us. .
How to let home appliances take orders from us?
There are many electrical appliances in the home, lighting, refrigerators, air conditioners, computers, home theaters... Some of them have remote control capabilities, such as air conditioners, TV sets... some do not have remote control functions, such as water heaters, microwave ovens, rice cookers, The refrigerator...and the different remote control devices have different remote controls, which are not universal with each other, so there are four or five light remote controls at home. So how do you remotely control a device that does not have a remote control function and how to make a remote control implement multiple remote control functions? From the above introduction, we know that products based on radio frequency technology can help us solve these problems, but they are How to achieve it?
The smart home wireless network mainly includes a home gateway and several wireless communication sub-nodes. There is a wireless transmitting module on the home gateway, and each child node is connected with a wireless network receiving module. Through these wireless network transceiver modules, data is transmitted between the gateway and the child nodes.
Home gateway
Home Smart Gateway is an intelligent control center for the home, with embedded processor and Armlinux operating system; with touch TFT LCD display (5 ~ 10 inches); 14 alarm point input and 2 alarm control output When an alarm occurs, the alarm can be sent through the network or by telephone; the wireless RF module on the gateway communicates with each sub-node in the network to realize home appliance control; the built-in Webserver realizes remote control of the home appliance through the Web. At the same time, the home gateway also has a picture, message, MP3MP4 playback function, which is convenient for the host to make warm messages.2. Radio frequency wireless communication sub-node
In different control systems, the wireless communication sub-nodes have different functions:
Lighting control, through the wireless remote control switch node to achieve the function of light switch and dimming;
Power control, remote control of the power supply of the appliance through the wireless remote control socket;
Curtain control, remote control of electric curtain motor through wireless curtain controller;
Home appliance control, remote control of infrared remote control appliances through wireless infrared forwarding module;
Relay output control for I/O control of electric windows and doors, gas valves, etc.
Ordinary household or commercial receivers usually use infrared (IF) signals, which require a straight path for signal transmission and reception, and are easily blocked by foreign objects. Using radio frequency technology, the signal transmission and reception is not blocked by foreign objects, and the reception is accurate and reliable regardless of the orientation or angle within the coverage of the system. In addition, the signal is transmitted by the 315 or 434MHz radio frequency depending on the area of ​​use, and the wall is beyond the wall and is not obstructed by any foreign objects. The system can be used in an open environment with a coverage of up to 100 meters. In addition, the wireless radio frequency has low power consumption and wide coverage. Whenever you go to any corner, the control is the most convenient, reliable, and comfortable.Taking a 200-square-meter house as an example, the indoor length is more than 30 meters. Therefore, with the coverage of 100 meters, the user can receive the command of the remote control no matter where the user goes, and the lighting can always match your pace. Each remote control, switch or dimmer switch is equipped with a wireless RF transmitter or receiver, so the remote control can directly issue commands to each switch to control the preset lighting conditions without any wires being connected. However, the indoor remote control distance of 30m is already the maximum limit of wireless radio frequency technology. If this distance is exceeded, the wireless signal is susceptible to co-channel interference and the signal is weakened, which is also the biggest defect of radio frequency technology.
Radio frequency control scheme
Lighting control
The wireless RF lighting control system consists of a smart panel switch and a dimmer that sends and receives command signals that are transmitted over the air rather than through the home's power line. Each panel switch is equipped with a different remote identification code. These codes utilize 19-bit identification technology to enable the receiver to accurately identify each instruction. Even if the neighbors use them at the same time, there will be no transmission errors due to interference from their remote controls.
The dimmer switch also has an RF radio transmitter built in. It can control the floor lamp or table lamp switch or adjust the brightness of the light independently of the remote control or moving switch. The back of the dimmer switch is also equipped with a clip that can be freely clamped to the wire or other conspicuous places, which is not easy to lose and flexible. Reduce interference, transmit or receive commands more accurately.
2. Wireless smart socket
The wireless smart socket series mainly realizes the remote control of non-remote control appliances (such as water heaters, electric fans, etc.) through wireless radio frequency technology, which not only adds wireless remote control functions to these electrical appliances, but also maximizes energy conservation and safety.
3. Scene remote control mode
A scene mode is a specific lighting environment that can be pre-set and restored. It achieves a specific lighting environment by locking the switch of a light and the brightness of the light. For example: the full closure of the lights, the night environment, the entertainment environment, etc. when leaving home or sleeping. The scene remote control not only controls a single switch and socket, but also controls the entire lighting environment in the home.
4. Information appliance control
Information Appliance Control is a multi-function remote control system that integrates infrared control and wireless control. It can control up to five infrared devices (such as: TVs, air conditioners, DVDs, amplifiers, curtains, etc.) and wireless devices such as switches and sockets. The information appliance control system is mainly composed of an information appliance controller and various intelligent remote control switches. The information appliance controller can transfer the code of the remote control of the ordinary infrared appliance through the learning method to replace the original home appliance remote controller. At the same time, it is also a wireless remote control, which can transmit the control signal of 433.92MHz frequency, so it can control the intelligent switch, smart socket and wireless infrared transponder in this frequency band.
How does the information appliance controller realize remote control of the air conditioner?
The infrared code of the air conditioner is quite different from the infrared code of other home appliances. The infrared code corresponding to each button on the air conditioner remote controller is not fixed. For example, pressing a button with an increase or decrease in temperature does not simply send a fixed temperature increase or decrease of the infrared code, but sends a code of the current working state to the air conditioner (how much does the code contain the current air conditioner? Still heating? What is the wind speed? What is the angle of the wind?). Therefore, the information appliance remote control can not simply learn a few buttons on the air conditioner remote control to achieve complete control of the air conditioner. The user can only control the air conditioner by learning the working status of the air conditioner.
5. Telephone remote control
The telephone remote control system mainly realizes the control of infrared appliances (mainly air conditioners) and wireless switches and sockets in the home by making telephone calls. It can be set directly through the telephone connected to the telephone controller, or it can be accessed by telephone; the telephone controller can control the lights, sockets and air conditioners in the living room, study and bedroom.
Let's take a look at a real-life case to see which wireless RF products are needed to complete some smart solutions.
1. House type
Three rooms and two halls: master bedroom, second bedroom, study room, living room, dining room.
2. The functions implemented
Home smart appliances, lighting systems; remote intelligent control appliance system (telephone, network); home security system; video intercom system.
3. System structure diagram
The two left vertical dotted lines in the figure indicate the infrared remote control signal; the other dotted lines indicate the RF remote control signal; the solid black line with the arrow is the security signal; the direction of the arrow is the signal transmission direction. In this picture, we mainly focus on the family part, and the community part is used for the overall community project.
4. Products used
â—Intelligent gateway
A home security function
Provide 14 channels of wired zone access, 2 channels of output; wireless disarming, emergency help and other functions; telephone and network for arming, with linkage control.
B video intercom (optional)
Through the connection with the door machine, the video intercom and unlock between the user and the visitor are realized.
C telephone remote control
The intelligent gateway is embedded in the telephone voice module, and realizes the telephone alarm function through the telephone line of the user; the security operation such as remote arming can be performed through the gateway telephone voice module; and the remote telephone control is performed on the home appliance and the lighting system.
D network remote control
Remote network control of home appliances, lights, sockets and security detectors in the home through the network; remote security disarming, alarm elimination, alarm inquiry and other functions in the home security system.
E home voice message
Record a voice message.
F mail service
Email sending and receiving function.
â—Information appliance controller
Realize all local remote control operations in the home, and directly control the code with smart sockets, switches, DVD remote control, TV remote control, curtain controller, etc. It is a multi-function remote control in the true sense.
â—Other remote control
Including scene remote control, mini scene remote control and enhanced scene remote control, it can achieve single control of lighting and different scene combination control.
â—Smart switch, socket
Works with the remote control to achieve intelligent control of the lighting effect.
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