preface

Nowadays, there are various doorbells on the market, which are basically installed and used by every household. There are two types of functions: wired and wireless. Wiring comparison of wired doorbell during installation The trouble is not beautiful, even the wall may need to be chiseled, there are many inconveniences, and such doorbells will gradually fade out of the market. Wireless doorbell is widely used. Basically rely on the transmitter and The two devices of the receiver work together to realize the wireless communication function and eliminate the middle pull wire and other links. At the same time, people like the colorful ring tones. For this kind of For electronic products, the transmitter is usually powered by the built-in 12V battery, and the receiver is connected to the battery or mains power to work. However, what I want to introduce to you today is a A new generation of self generating wireless doorbell linbell G4. The transmitter of this doorbell does not need batteries. Instead, it uses LinkedIn's core kinetic energy generation technology to press the doorbell button every time Both can be converted into electric energy and transmit wireless signals. The receiver buttons and the illuminant are integrated, giving a sense of technology. It is believed that many people have a great impact on this battery free doorbell Curiosity. How on earth is it realized? How does it work? Don't worry, I will lead you to get closer from unpacking, appearance, disassembly, modification, experience, etc Solve the mysteries of this self generating wireless doorbell.

Unpacking

First of all, thank you Love to play computer games The platform gave me the opportunity to evaluate this time. Although I already have a wireless doorbell at home, I still have great interest in the wireless doorbell without batteries . The product has been received for many days, so take advantage of the weekend reverie to write some thoughts on the use of this product!

The product is packaged with recyclable hard kraft paper. The manufacturer information of this product is printed on the front: Linptech LinkedIn Technology. It is based on Huazhong University of Science and Technology Technology companies. Has been committed to the development of novel, fun, environmental protection, easy to use new products.

The model and specification of this product are printed on the back: G4SW, Color: white. There are a lot of functions listed: no battery, wireless remote control, free code checking, power-off memory, front and rear distinction Door, adjustable volume, ultra-low power consumption. The small doorbell has so many functions! It blinded my eyes. Scanning the QR code at the bottom can focus on popular science and technology. There are many Many new products of technology are waiting for you to explore your taste.

The product content includes a transmitter, a receiver, a set of fixing screws, a manual, and a 3M double-sided adhesive backing. The layout is compact and orderly, not too occupied Large carton space.

On the back of the double-sided adhesive tape, there are also warm instructions for installation and operation.

The user guide also records in detail the quick experience of using this product, installation instructions, addition and deletion of code and text instructions.

Appearance

The exterior color of the doorbell is white, slightly frosted and light. Linbell with abstract artistic symbols on the front, the panel function keys and horn holes are very eye-catching Receiver size: 83 * 48 * 23.5mm. Weight: 59g. National standard two plug interface.

The mounting screw holes have been reserved on the back of the transmitter. At first glance, they are no different from ordinary transmitters. Where is its self generating device hidden? Don't worry and then look down. Transmitter size: 83 * 46 * 20mm. Weight: 45g.

Disassembly

First, disassemble the transmitter, and use a screwdriver to pry open the rear housing through the hole under the box. Each component is assembled in a hook type structure without using a screw to fix the housing.

The internal circuit board is very small. I really don't see any batteries! A circle of red wire on the edge provides a hidden antenna for this transmitter. Compared with the serpentine antenna on the ordinary doorbell board, the effect should be better and the transmission distance should be longer.

There are not many circuit board parts. It is mainly composed of low-power radio frequency chip CC115L and peripheral rectifier protection circuit. In addition, there is a 14 pin chip, the body mark has been polished, and the specific parameters are unknown. It should be a wireless transceiver code matching chip through visual inspection. Maybe the official considers the protection of technology property rights! The whole circuit board can be taken out by opening the fixed welding spot of the coil at the red circle position. There is no part on the back of the PCB board, and the circuit design and wiring of the double-sided board are clear, reasonable and scientific.

The self generating press mechanism is mainly introduced, which is composed of closed coil, magnet and return spring.

It can be clearly seen from the following group of dynamic diagrams that when pressing the transmitter pressing plate, the return spring compresses, driving the magnet downward; when the finger leaves the pressing plate, the return spring recovers, driving the magnet upward. because After pressing the pressing plate, the magnet will produce displacement, which will change the magnetic flux of the closed coil and generate induced electromotive force . Generally speaking The self generating technology uses Faraday's law of electromagnetic induction. Magnetic energy generates electricity, and electricity generates magnetism.

How much power can be generated by one press of self generation? It can be clearly seen through the test of the instrument below. When the switch is pressed, the induced electromotive force generated from the generator coil is only 62mv, and this weak signal is not enough to drive the load behind. What should I do? When the closed coil is connected to the PCB circuit board, the weak electrical signal can be rectified, boosted and filtered through the back circuit, and the peak voltage can reach about 1.8V, which can drive the whole circuit board to work normally.

Disassemble the receiver section:

The receiver is disassembled with a hard paddle, and the same hook type package can be easily opened. A circle of red line material is also seen on the periphery, which is the built-in antenna of the transmitter.

Solder down the 220V power connection of the circuit board for further analysis. No protective measures are taken for the welding spot, which is slightly suspended. High and low voltage components are relatively compact. At least get an insulating mylar piece to protect it!

The receiver is suitable for wide voltage input 100~240VAC and can work normally. The internal circuit is common Constant voltage and current primary side controlled power switch SM7503P chip.

The rectifier bridge stack MB8S converts AC mains power into DC voltage required by the circuit board. The withstand voltage can reach about 800V, and the performance is reliable.

11175L15 is the voltage stabilizing chip of the circuit, and FR0396 is the ring tone chip.

Radio frequency receiver CC113L chip and BS003F3P6 single-chip chip, interested friends can check Baidu. A small 7D471K blue part is also distributed beside them. This is a varistor for lightning protection. When the mains voltage rises unexpectedly, it can effectively protect the doorbell receiver.

The sound generator is a common moving coil horn structure. 8Ω/0.25W

On the back of the circuit board, there are only internal keys and patch indicator components. On the left is the volume adjustment key and on the right is the ring tone selection key.

Modification

All disassembly processes are basically completed. The transmitter components of this self generating doorbell are modified and the work indicator light is added. When someone presses the panel switch, the indicator function will be activated. The original transmitter does not display the indicator light. Will outsiders think that the doorbell has no power?

Add a small LED light on the chip at the corresponding circuit position of the transmitter, and when it is turned on, it can send out a dazzling blue light.

The transmitter panel shall be drilled and the LED indicator light shall be fixed at the corresponding opening position. The doorbell after opening has no effect on the overall appearance structure.

Experience

Compare the self generating wireless doorbell with a small K doorbell at home. Linbell seems to be smaller in size. The only difference is that the transmitter of the small K doorbell needs to be equipped with a 12V battery to work.

Use a power meter for power consumption test. In static state, the small K power consumption is 0.52W, and the linbell self generated power is 0.28W.

When the dynamic bell rings, the small K power consumption is 1.07W, and the linbell power consumption is 0.55W.

Through the noise meter test, in terms of ring amplitude, the small K volume is louder than the linbll sound, which can reach more than 100 decibels.

Since the hole position for the installation of the small K doorbell transmitter is different from that of the linbell hole, the hole shall be re opened and the door position shall not need to be excavated again.

Tear off 3M double-sided adhesive backing for pasting.

Fix the transmitter at the appropriate position of the gate and lock the screws. It can be easily done with a screwdriver. Align the upper and lower hooks and close the transmitter.

Press the transmitter to check the working effect of the doorbell? You can see the blue indicator light! The effect is strong.

The details explain how to pair the doorbell and select the bell. In fact, the instructions are very detailed. Ordinary people can understand. Let me just say a few more words! The left key of the indicator on the receiver panel is the volume adjustment key. There are five gear selections. Mute. 1.2.3.4. Each time the volume is set, it will be automatically memorized. When it is plugged in after power failure, it will automatically memorize the last set value. It is not necessary to set again. The key on the right is the ringtone selection key. Short press to select 36 different ringtones. When you have selected your favorite music, long press the right key or the left key for more than 3 seconds. At this time, the indicator light will start to turn on and off gradually, indicating that the receiver has entered the learning mode. Then release your hand and wait for the transmitter to press. When the transmitter is pressed, the music will ring, which is the ringing effect you just selected. It also has memory function after power failure. There is no need to repeatedly check the code. Through the code matching operation, you can flexibly achieve the effect of one dragging many, and multiple dragging one, to meet the needs of different places.

In addition, the instructions here describe the switching of 16 music modes. To be exact, there should be 36 ringtones with different sound effects, piano music, animal sounds, and alarm sounds. Every capital is so beautiful and cheerful. It greatly meets the needs of different people for the choice of ringtones.

summary

I was very satisfied with the appearance, structure and performance of this self generating doorbell from disassembly to installation. Compared with the ordinary wireless doorbell, it is less inconvenient to replace the transmitter battery. For the transmitter that uses the battery, the battery has been used for a long time, and the leakage has caused the metal spring contact of the battery compartment to become mildewed and corroded, resulting in the indirect ineffectiveness of the doorbell after being pressed. This unnecessary worry can be saved by replacing the Linbell self generating wireless doorbell. In addition, the power consumption of the receiver plugged into the socket for a long time is relatively small, saving power and money! The door of the home is a metal door structure, which does not affect wireless signal transmission in the slightest. The reception distance is also perfect. The distance from the gate to the living room is 5~6 meters. Each press can ring the bell. Suggestion: I hope the manufacturer can add the transmitter indicator structure. I believe many people will like this function, and modify the error in the manual.

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