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Common Problem

  FAQ

Q
What are the characteristics of the Airtouch Technology's chip solution? What are the advantages?
Details
A

Compared with the traditional solution, the AT5810/AT5810S/AT58MP1T1RA/ AT58MP1T1RS8 chip integrates a phase-locked loop function, which can lock a fixed frequency; it can be adjusted by software to change the time, sensing distance, PWM output and other functions, which can quickly and flexibly match with peripheral products ; In mass production, the consistency is high, the stability is good, and the operation is convenient.

Q
What should I pay attention to when installing or using the radar module?
Details
A

Common precautions are as follows:

(1) The sensing distance is measured under certain test conditions. The actual sensing distance is related to the hanging height, the openness of the test site, the size of the tester (high, short, fat and thin), and the step direction. The sensing distance of the final product is recommended to Actual measurement shall prevail;

(2) When the radar sensors are densely distributed, try to ensure that the radar antennas are parallel to each other to avoid direct illumination between the antenna surfaces; for scenarios where the radar antennas may illuminate each other, it is recommended that the installation distance exceeds 1m; for aging tests and other densely distributed For the scene, ensure that there is a distance of more than 20cm between the lights;

(3) Microwave induction radar has a certain internal force through the wall. It can penetrate and sense thin wooden walls and glass walls, but it is generally not easy to penetrate and sense solid brick walls.

Q
How to reduce the sensing distance on the back of the radar module?
Details
A

(1) Normally, the directional pattern is basically determined after the antenna form is fixed, and the antenna backlobe optimization can consider the use of a more directional antenna;

(2) When designing the antenna: keep the antenna surface away from the edge of the board as much as possible, increase the size of the board as much as possible, and cover the ground on the bottom as much as possible; consider placing a shielding cover on the back of the module to reduce the radiation effect of the antenna on the back of the module;

(3) The test environment will affect the corresponding test results: In general, there is reflection in the indoor space, which will cause the sensing distance behind the module to be relatively far; but in an outdoor environment, this situation will be reduced.

Q
What special requirements does the radar module have for PCB plate making?
Details
A

The reference board design provided by the Airtouch Technology has requirements for the laminated structure of the PCB and the dielectric constant of the sheet. For details, please refer to the "PCB Manufacturing Process Parameters" document of each reference design.

Q
Why does infrared receiver/photosensitive interfere with radar? How to avoid it?
Details
A
reason
Infrared receiver/photosensitive is a non-linear device mixed with TX signal to produce clutter signal, which will cause interference after being received by RX;
Circumvention method
(1) When designing the structure, the infrared receiver/photosensor should be placed far away from the radar, especially the TX antenna far away from the radar;
(2) Shielding the interference on the software, ignoring the radar sensor signal during infrared reception;
Q
What should I pay attention to when building a board according to the reference board design information provided by the Airtouch Technology ? Which parameters have a greater impact on the consistency of the module?
Details
A

The thickness of the board (or the laminated structure of the board) and the dielectric constant of the board are the most important things to pay attention to. The consistency of the thickness and the dielectric constant of the board is most closely related to the consistency of the module.

Q
For terminal products that need to be connected to the Internet, what should be paid attention to nowadays for the coexistence of radar sensors and wifi/BT/NB?
Details
A
(1) Stagger as far as possible in space, and extend the distance between the antenna of the IoT module and the antenna of the radar;
(2) Stagger the time as much as possible, and shield the radar sensor signal when the IoT module communicates;
Q
Why does the buzzer switch and indicator flashing interfere with the radar module? How to avoid it?
Details
A
reason
(1) The buzzer switch will disturb the power supply; (2) The buzzer switch and TX signal will mix; (3) The indicator light and TX signal will mix
Circumvention method
(1) When designing the product structure, place the buzzer and switch away from the radar;
(2) The product software shields the interference and ignores the radar induction signal when the buzzer switch and indicator light flash;
(3) Update the sensor software algorithm, and adopt a specific software version for scenes with strong interference.
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