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The induction doorbell, also known as the greeter, is an electronic product used in small stores and convenience stores to guard against burglary. The English name of the induction doorbell is Automatic Door Bell. The predecessor of the greeter is an electronic anti-theft alarm; People used it to guard against theft in advance, but later, because the electronic anti-theft alarm made a harsh alarm sound, which had a negative impact on customers entering the store, it later evolved into a more pleasant sound, such as ding dong, hello, welcome, and even some induction doorbells that users can freely change voice content, welcome doorbells that can be recorded independently, etc, For example, MicroSound voice prompt is popular among users. Welcome induction doorbell reports welcome voice and festival promotion activities as soon as the customer enters the door, which plays the role of polite greeting and prompt, and at the same time, it serves the dual role of reminding the shop staff that someone has entered the store and welcoming the customer. Generally speaking, whether it is called an induction doorbell or a welcome device, it is actually a voice prompt device. However, according to the different functions and uses, the requirements of the induction doorbell are small and exquisite in size, convenient in use, sensitive in sensing, and beautiful in sound quality. It can send welcome statements when users enter or leave the room. At present, the main doorbell used in the market is the MiscroSound human body induction voice prompt, which has a small appearance. As an induction doorbell, it can be divided into infrared human body induction, light induction, two-way induction, etc. according to different uses and requirements, and different induction methods; According to different voice content, there are fixed voice content, voice can be changed independently, and voice can be recorded.
two thousand and thirteen
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eleven
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thirty
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The induction doorbell is a new type of doorbell, which is mostly used in small stores. It can not only welcome guests but also guard against theft. At present, the induction doorbell has a light sensing doorbell and an infrared sensing doorbell. The working principles of the two doorbells are different. Due to different quality, the price of the induction doorbell is also very different. I hope you can pay attention when you choose. With the progress of science and technology, more and more scientific and technological products appear in our lives. The induction doorbell is a new type of doorbell. The induction doorbell, also known as the greeter, is an electronic product used in small stores convenience stores in recent years to guard against theft. The induction doorbell is a voice prompt device that obtains the information about the existence of an object through various sensors, converts it into an electrical signal, and uses the electrical signal to control the playing of welcoming words or music. Principle of light sensing: the light sensing greeter uses the human body to reflect light, and the photosensitive resistor to get a sufficiently large change of light. The circuit generates a change current trigger circuit, and the sensitivity is concerned with the reflectivity of the object. The light sensing greeter is related to the ambient light intensity, and cannot be used normally in darkness. Principle of infrared induction: infrared pyroelectric sensor, action mode: passive, It does not emit any signal, so it does not produce harmful electromagnetic interference. The central wavelength of infrared radiation of human body is 9~10 -- um, and the wavelength sensitivity of the detection element is almost stable in the range of 0.2~20 -- um. A window with a filter lens is set on the top of the sensor. The wavelength range of the light that can pass through the filter is 7~10 -- um, which is just suitable for the detection of human infrared radiation. The infrared of other wavelengths is absorbed by the filter, thus forming an infrared sensor specially used to detect human radiation. At present, infrared human body sensing doorbell is widely used in the market, such as MicroSound voice prompt, which is compact in appearance. As an sensing doorbell, it can be divided into infrared human body sensing, light sensing, two-way sensing, etc. according to different uses and requirements, and different sensing methods; According to different voice content, there are fixed voice content, voice can be changed independently, and voice can be recorded.