After the Fukushima earthquake in March 2011, many areas in eastern Japan have not resumed power supply. On May 5, 2012, Unit 3 of the Hokkaido Power Company Bob Nuclear Power Plant was shut down. All the nuclear power plants in operation in Japan were shut down. The shutdown of the nuclear power unit has further exacerbated the power shortage in Japan.
Accordingly, the Japanese government began to implement the "ecological points" program, as well as the establishment and implementation of the Green Procurement Law, Electrical Appliances Safety Law. Among these policies, energy conservation incentives for lighting facilities, for areas using LED lighting, further reduce electricity prices based on their energy savings. In 2011, the sales volume of LED lighting fixtures in Japan increased by 268% compared with the previous year, while in 2012 it is expected to increase by 185%. Mu Zhengdian said that in 2011, sales of LED lighting products accounted for about 20% of all lighting products, and this proportion is expected to reach 42% this year.
In order to further promote the use of LED lighting, Mu Zhengdian also proposed to develop an international standard for LED lighting industry. According to the Japan Lighting Industry Association's comparison test of 12 kinds of LED lighting products on the market in Japan, when the same product uses the US Department of Energy LED performance standards and the Japan Lighting Industry Association LED performance standard test, the difference between the two can be close to 50. %. Therefore, it is necessary to develop universal international testing standards. Mu Zhengdian believes that the new international standards should clarify the standard parameters of the lighting performance of LED products, such as luminous flux, color temperature, service life, etc., while providing consumers with clear and easy-to-understand instructions for distinguishing different LED products. .
What is 2.4g wireless module?
2.4g line module operating frequency in the range of 24400-2484mhz, can communicate through the scanning protocol, air rate up to 1Mbps, output power up to +4dBm, the module has the advantages of low power consumption, cost-effective. Movingcomm's current 2.4g antenna modules are: IOT04, IOT05, IOT09, IOT18, IOT60, etc. Users can choose a variety of modules with a transmission distance of 50-500 meters according to cost considerations.
Second, the role of 2.4g wireless module
Function 1, for the formation of a star topology wireless communication network, and must be a multi-point star topology, some extraordinary places need wireless communication. On the one hand, the transmitting and receiving module is cheap, and the cost of forming the star topology is relatively low. On the other hand, the transmitting and receiving module can adopt the modular design, which is small in size, easy to use and easy to integrate. For the wireless network with low communication speed and close distance, the transmitting and receiving module is very practical.
Function 2, for wireless multi-channel (parallel) control. Such as complex remote-controlled robots, some places require multi-channel (parallel) control. One method is to use the receiving module to directly connect to the decoder, and then connect to the relays and other electronic components to drive the subsequent controlled object; the other method is to use the receiving module to connect to the single chip microcomputer, and after the data is disposed of, the single chip microcomputer is connected to the relays and other electronic components to drive the subsequent controlled object. Usually a pair of transmitting and receiving modules can achieve up to six parallel wireless control, if the required number of channels is greater than six, you can use multiple pairs of transmitting and receiving modules, and work at the same time to meet the actual needs.
Function 3, used for general serial port, RS232 antenna data transmission, there are usually many control instruments and equipment using serial port, and communication with these devices must meet the requirements of serial port. In some extraordinary places, when the industrial control site must use the antenna transmission mode, it is natural to choose the transmitting and receiving modules mentioned in this article, but it must be explained here that to use this communication mode, the corresponding software must be prepared at the transmitting end and the receiving end respectively to achieve the conversion of file formats, in order to achieve the purpose of wireless communication, if the communication system is full-duplex. It can be achieved by using two pairs of transmitting and receiving modules, working simultaneously.
Third, 2.4g wireless module application field
2.4G wireless module is widely used in wireless health sports products, wireless mouse and keyboard, product information push, wireless remote sensing, wireless ranging system, alarm security system, smart home, toy control, tire pressure monitoring and other fields. With the 2.4G wireless module, all the whole house wireless smart home can be linked together, you can control all the smart home devices through the link of the network, and then you can control the switch of all the whole house wireless home, adjust the brightness of the lamp, adjust the rise and fall of the curtain, etc., through the continuous innovation of technology, The whole house wireless smart home can be controlled by a small white robot voice, can be controlled by a smart scene panel, can be controlled by sensors and so on.
Four, 2.4g wireless module how to choose antenna
In general, the 2.4g wireless module requires an impedance of 50 ohms, a red wire used with 2.4g, a 2.4g folded rod antenna, a 2.4g gold-plated straight head rod antenna, a 2.4g gold-plated elbow rod antenna, and a 2.4g small suction cup antenna. These antennas are special antennas designed for 2.4g wireless communication system, antenna standing wave ratio performance is good, small size, clever structure, easy installation, stable performance, with good anti-vibration and aging ability.
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