On August 31, 2016, the 5th Smart Home Technology Seminar hosted by electronic enthusiasts was held in the Chrysanthemum Hall on the 5th floor of the Shenzhen Convention and Exhibition Center. More than 200 engineers from all over Guangdong and Shanghai gathered together.
Chen Lu, editor-in-chief of e-birth, introduced the market trend of smart home growth in the next three years. The highlights of this seminar include "What impact will the latest wireless technology have on the development of smart home market? 2.4GHz smart home What are the landing solutions? Product innovation and development trends in the smart home industry? How do smart home products and other devices use the cloud platform to achieve interoperability? The eight industry elites from the industry bring the latest to the audience. Market and technical interpretation.
Philips Lighting Director Huang Feng:
　　 Bluetooth 5.0 lacks smart home application layer protocol, NB-IoT technology needs to solve billing mode and device delay hotspot in smart home field
Huang Feng believes that the connection of smart home is very complicated. Haier, Midea and other home appliance manufacturers, international intelligent control company Siemens, IT manufacturers such as Xiaomi, Jingdong, etc. have entered smart homes, in addition to the intelligent lighting manufacturers Philips, Opt, and Many startups are entering this field. Smart home landing, the protocol standard has become a key point of interconnection.
Philips Lighting Director Huang Feng
　　 · Huang Feng believes that Bluetooth 5.0 has been upgraded to 4.2 standards. Although there are three key performance improvements, there is a lack of smart home applications. ZigBee 3.0 is more suitable for smart home scenarios.
　　 · There is no version of the Bluetooth 5.0 standard. It is revealed that the new standard will increase the requirements in terms of transmission distance, transmission rate and optimization function:
1. Increase the transmission distance. The traditional Bluetooth transmission distance is 5 meters. Now the low-power Bluetooth can reach 60 meters. The effective transmission distance to Bluetooth 5.0 will be 4 times that of the 4.2LE version. The effective working distance between the Bluetooth transmitting and receiving devices. Up to 300 meters;
2, the transmission rate is twice the 4.2LE version, the speed limit is 24Mbps;
3, the ability to optimize the broadcast, many in order to better adapt to the scene, improved the ability of about 8 times. These features are not optimized for smart homes, but Smart Mesh is optimized for smart home needs.
Does the Bluetooth 5.0 standard match the current smart home development requirements? Bluetooth 4.0 used to be called classic Bluetooth, mainly point-to-point, point-to-multipoint audio and video operations. Bluetooth 4.2 adds three features: support for IoT connectivity, Bluetooth 4.2 devices can connect to the Internet directly via IPv6 and 6LoWPAN, and support low-power IP connectivity. Second, to increase the low-power mechanism, a dry battery can be used for half a year, and the security is enhanced. If the user license is not obtained, the Bluetooth signal will not be able to connect and track the user equipment, and the intelligent positioning cannot be performed. Third, in terms of transmission performance, the Bluetooth 4.2 standard increases the data transmission speed by 2.5 times, mainly because the capacity of the Bluetooth intelligent data packet is increased by 10 times compared with the previous one, and the transmission error rate is reduced.
There is no version of the Bluetooth 5.0 standard, which adds three requirements: 1. Increase the transmission distance, the traditional Bluetooth transmission distance is 5 meters, and now the low-power Bluetooth can reach 60 meters, and the effective transmission distance to Bluetooth 5.0 will be 4.2LE version. 4 times, the effective working distance between the Bluetooth transmitting and receiving devices can reach 300 meters; 2. The transmission rate is twice the 4.2LE version, and the speed limit is 24Mbps; 3. The ability to optimize the broadcast, many to better adapt to the scene , improved the ability of about 8 times. These features are not optimized for smart homes, but Smart Mesh is optimized for smart home needs.
Bluetooth Smart Mesh V1, Bluetooth 5.0 may support Bluetooth Smart Mesh V1. Plan to standardize this content in the first quarter of 2017. Bluetooth lacks the protocol for smart fixtures, and Smart Mesh plans to add these standards to the application layer. How Bluetooth 5.0 is backward compatible with Bluetooth 4.2 and Bluetooth 4.0, the Bluetooth standards organization is discussing.
Huang Feng revealed that NB-IoT technology is suitable for smart parking, remote meter reading and other fields, but it faces the hot issues of billing mode and equipment delay in smart home applications.
Does NB-IoT technology match the needs of the current smart home market? NB-IoT refers to low power consumption and wide coverage of narrowband Internet of Things. A base station can build 6 sectors, and a sector can build 50,000 nodes. It has super coverage capability and can be widely used in remote meter reading, intelligent parking, intelligent street lights and other fields. Under the 3GPP promotion, the cost of the NB-IoT chip is 5 US dollars. After the manufacturer plans to mass-produce the chip in the future, the price will reach about 1 US dollar. This technology has four major characteristics:
Large-scale applications of NB-IoT technology will appear in 2017. Main applications: intelligent meter reading, intelligent parking, one base station wide coverage in one block, parking position sensor through NB-IoT connection; intelligent street light: wide coverage of base station, intelligent street light and management system direct communication.
NB-IoT technology is mainly for group users, charging for traffic and connection points. In the smart home field, there are some points worth discussing from the business model and connection method: 1. Billing mode, for home users, for each connection Equipment charging, household user acceptance is not high; 2, battery life 10 years is based on long-term sleep of the equipment, wake up once a day, on the basis of operation, smart home equipment is frequently operated, such as sensors, need to consider battery life; When the device is extended, the devices communicate with each other. All operations need to go through the remote system on the base station, and the operation is delayed.
Resistive Touch Screen
The outermost layer of resistance screens is usually a soft screen that connects the internal contacts up and down by pressing. The inner layer contains the oxidized metal of the physical material, namely N-type oxide semiconductor (indium oxide), also known as indium oxide, with an optical transmittance of 80% and the upper and lower layers separated by the middle. ITO is the main material used in both resistive and capacitive touch screens. Their working surface is the ITO coating. The outer layer is pressed by fingertips or any object to make the surface film concave and deformed. According to the leading line number of screen, divide again have 4 line, 5 line and much line, threshold is low, cost is opposite cheap, advantage is not affected by dust, temperature, humidity. Disadvantages are also obvious, the outer screen film is easy to scratch, can not use sharp objects to touch the surface. In general, multi-touch control is not allowed, that is, it can only support a single point. If two or more contacts are pressed at the same time, they cannot be recognized and accurate coordinates can be found. To enlarge a picture on the resistance screen, you can only click "+" several times to make the picture be enlarged step by step. This is the basic technical principle of the resistance screen.
Control by pressure induction. When a finger touches the screen, the two conductive layers are in contact at the touch point and the resistance changes. A signal is generated in both X and Y directions and transmitted to the touch screen controller. The controller detects the contact and calculates the position of (X, Y), then works according to the simulated mouse mode. Resistive touch screen is not afraid of dust, water and dirt, and can work in harsh environments. But because the outer layer of the composite film is made of plastic material, its anti-explosion property is poor, and its service life is affected to some extent.
The resistive touch screen is controlled by pressure induction. The surface layer is a layer of plastic and the bottom layer is a layer of glass, which can withstand the interference of harsh environmental factors. However, it has poor hand feel and light transmittance, so it is suitable for wearing gloves and occasions that cannot be touched directly by hand.
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Tonya Display Limited , https://www.tydisplay.com