With more and more products in the IoT market and more and more mature technologies, Zigbee has been used as a low-power technology with 15 years of history in the field of automated lighting and industrial control. Its stability and high confidentiality. The advantages of low power consumption and low cost have become a highly demanding technology in the domestic market. However, looking at the development trend of Internet of Things technology and industry in the international market, Zigbee technology needs to further break through the three major bottlenecks and obstacles in order to take the lead in the tide of the Internet of Things. Mohan, an expert in designing the underlying communication protocols for the network, points out that the Internet of Things requires a set of open application interfaces (APIs) and communication protocols that work with different physical layer networks. Mohan is a co-founder of Enlighted. He has worked for Netcom equipment manufacturers such as Cisco, Novell and Novell, and has developed multi-protocol protocol routers in Hughes. He believes that Zigbee has not learned from the Internet industry. The current development requires too much manual support, and it has not left the initial stage of adoption: "At present, Zigbee's main adopters are lighting control solution providers, they do not understand what they need. Network security, this kind of communication protocol will always be in a backward state; if system vendors such as Aruba and Cisco are to dominate Zigbee, they will find a way to run ahead." 1. The first is the unavoidable 2.4G band interference problem. In fact, according to cisco internal literature, since the 2.4G frequency band is a global free frequency band, the equipment using the 2.4G frequency band is growing rapidly and the actual use quantity is too large. The 16 communication channels of the 2.4G frequency band have become too much in the past 20 years. Overcrowded, and devices that interfere with each other's network and cause them to malfunction normally occur frequently. It is not difficult to understand that the wireless mouse and the network card on the same computer interfere with each other, and different wifi in the same building interfere with each other. Such things happen every day. This has caused real problems for the need for highly reliable use environments such as commercial buildings and campus networks. Since the interference in the 2.4G band is so serious that all new generation wireless routers have been fully considered from the beginning of design, they must be compatible with both the old 2.4G band and the newly adopted 5G band. And Zigbee seems to be completely unaware of the huge risks that this brings. Zigbee is a low-power RF device. Zigbee's lower transmit power will be interfered and suppressed by other 2.4G devices, especially wifi, in an environment full of high-power 2.4GIT equipment network equipment. Zigbee networks can experience delays in control commands, loss, and even network failure. Mohan pointed out that if someone is using Wi-Fi to transport streaming media, the gates controlled by Zigbee may not be able to be opened. Users must confirm that each floor uses a different 2.4g wireless channel to avoid network collision and interference. "You can't sell such a solution to current electric technicians." A European industry giant, Danfoss, tested several vendors' chipsets and found that ZigBee wireless signals were blocked by wireless local area network (WLAN) signals in all but one exception. In the 2.4G frequency band, at least the following types of equipment are flooded: Wifi – 2.401~2.4835GHz (router, wireless video head.) Bluetooth - Bluetooth 2.4015~2.4805GHz Computer keyboard, mouse, Sony PlayStaTIon 3 and Nintendo Wii wireless game controller, Baby monitor.
Features
A Push Button Switch is a switch that has a knob that you push to open or close the contacts. In some pushbutton switches, you push the switch once to open the contacts and then push again to close the contacts. In other words, each time you push the switch, the contacts alternate between opened and closed. These types are commonly called latching switches. There are also Non latching push button switches that only maintain the switch contacts when the switch is help in position. Once the switch is let go, the current is broken and the switch turns off. Push switches are usually a simple on-off switch.
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November 17, 2020