sketch:

Wuhan Linkup Technology Co., Ltd. is a high-tech enterprise based on Huazhong University of Science and Technology, located in "China Optics Valley • Wuhan". The company is committed to providing products, basic modules and solutions for smart homes and smart buildings based on energy collection technology. The product "kinetic energy generator" has full independent intellectual property rights, and is stable and reliable, Corresponding intelligent products can be produced with the application circuit. Linbell G4 kinetic energy self generating wireless doorbell is a digital product based on the power generation module.
The company's main products include: kinetic energy self generating wireless doorbell, kinetic energy self generating wireless switch, and kinetic energy self generating wireless socket.  
Now let's take you to enjoy the style of linbell G4 kinetic energy self generating wireless doorbell.

1、 Unpacking

The outer packaging of the product is sealed with environment-friendly hard kraft paper, and the user is specially reminded to reuse the packaging box, with the manufacturer's information of the product printed on the front: Linptech Linktop Technology, simple printing without losing atmosphere.

There are various function marks on the back, and white printing paper printed with the name, model and manufacturer details of the doorbell. It can be seen that this packaging box is a universal box

When you open the box, you will see that the doorbell and wireless transmitter are firmly fixed in the center of the box in a unique way

The host and all accessories are available

The instructions are simple and clear, which can be understood by ordinary people and easy to use

There are warm tips on the 3M sticker. The manufacturer is considerate

2、 Hardware analysis and application

As for the quality of a digital product, my habit is to look at the internal materials and workmanship, and pay particular attention to the details, because the technical level and ability of the manufacturer can be seen indirectly through the materials and workmanship, and the details can be seen whether the manufacturer is considerate, rather than looking at rhetoric.

First, take a look at the appearance of the doorbell. The whole body is matte white with strong texture.

It can be seen from the side that the upper part is large and the lower part is small, and the middle part is crossed by a smooth curved surface. This is easy to plug in and out, easy to control, and the details are handled perfectly.

The top of the front is a symbol of linbell+bell, and the bottom is a volume adjustment key and a ring selection key. The volume can be divided into five levels, from 0 to the maximum. There are 36 different kinds of ringtones for users to choose. When one is dragged for many times, different transmitters correspond to different ringtones to identify visitors at different entrances. The settings are also very simple.

When the upper cover is opened below, a red wire is ingeniously inlaid at the edge of the shell as the receiving antenna of the doorbell.

The back of PCB is relatively simple

Component surface, including power supply part, music piece and receiving part

This is the power part

This is the receiving board

This is 36 8-chord musicals

Next, let's look at the self generating wireless transmission part, which is composed of a box, keys, generators and lines. This is the key part of the doorbell.

The shell is made of the same material as the receiving part.

Open the box cover, and there is also an antenna embedded in the gap of the shell, and the circuit board is in the middle

The circuit board consists of three parts: the power supply part, the coding part (estimated, not necessarily accurate, one 14 pin chip is not marked, please give me your advice!), the wireless transmitting part, and the wireless transmitting chip and the wireless receiving chip are used in pairs. The working principle of the power supply part is roughly as follows: when the high voltage small current spike pulse voltage delivered by the generator (see details in the generator part) is rectified and stored, it will become low voltage (the voltage required by the circuit) and large current (enough to drive the circuit current). In actual use, it is found that the doorbell only sounds when the key is pressed, and the doorbell does not sound when the key is released for resetting. However, there are two power generation processes when the key is pressed and released, so it can be seen that half wave rectification is used for rectification.

Take a look at the close-up of the chip

Back of PCB board

Now let's take a look at the generator, the most important part of this article

Remove the key handle rocker

Key handle rocker

Return spring

Generator front

On the back of the generator, it can be seen that the wire bundles are very thin and many. The more turns, the higher the voltage, the smaller the wire diameter, and the greater the equivalent internal resistance. Therefore, it should be noted that there will be large errors when measuring with a general voltmeter

Remove the permanent magnet

Generator coil core

Permanent magnet

Brief description of the principle, as shown in the following diagram, is the initial state. When the key is pressed, the rocker quickly presses down the permanent magnet due to the effect of elasticity, and the iron core of the coil moves in the magnetic field, which is equivalent to the coil cutting the magnetic line of force in the magnetic field, generating a tooth shaped voltage from weak to strong, with a maximum of 14 to 18V. Similarly, the same voltage will be generated when the reset is released, It's just in the opposite direction.

In the experiment, the doorbell was placed at home, separated by three walls, and then the distance of the launch button was adjusted. The doorbell could still ring when it was 16 meters away from the last wall, indicating that the launch distance was far enough to meet the use of more complex environments.

3、 Summary

It has the following advantages through use:

1. High appearance, beautiful atmosphere, easy to use, electricity saving.

2. The wireless transmitter does not need a battery, and there is no need to replace the battery. This is the biggest selling point of this doorbell.

3. It can realize one to many, different transmitters correspond to different ringtones, and the settings are simple. This is the second selling point of this doorbell.

At present, linbell G4 self generating wireless doorbell is in the stage of crowdfunding. If you want to own this doorbell, please click

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