ماژول سنسور رادار تشخیص حرکت انسان با فرکانس 5.8 گیگاهرتز HLK-LD012-5G
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Introduction
HLK-LD012-5G is an ultra-low power 5.8G radar sensor launched by Hilink Electronics, with an overall power consumption of about 68uA.
The module size is 20mm*20mm.
The module fully integrates 5.8GHz microwave circuit, intermediate frequency amplifier circuit and signal processor.
It has high integration and good production consistency.
The peripheral is equipped with a small planar antenna to ensure the performance of the sensor while greatly reducing total measurement.
The sensor can be used to detect the presence of human body or various scenes of moving target
sensing, including smart home, Internet of Things, and smart lighting.
It is especially suitable for low-power battery-powered scenes such as night lights, solar street lights, and wireless cameras
The PIN distance is 2.54mm.
If you need to tune the distance and delay time and other parameters,
you can hang or pull down P2 and P3.
The state matches the specific resistance on the module to select the corresponding gear or use the external MCU reserved on the module to rewrite the internal parameters.
The following table shows the definition of each PIN:
Sensing time and sensing distance adjustment
The P2 and P3 pins on the HLK-LD012-5G module are used to select different sensing distances and delay gears.
P2 is used to adjust the sensing distance, which can be provided with the 3 resistors (th0, th1, th2) reserved on the module 16 different sensing distance options.
When P2 is suspended or pulled up, the sensing distance of the module is far.
when P2 is pulled down, the receiving gain is reduced by 18dB and the sensing distance is short.
The three distance adjustment resistors on the module are used to adjust the threshold of the inductive judgment. The
resistance bit NC represents 1, and the 0 ohm resistor represents 0.
The smaller the threshold, the farther the sensing distance.
P3 is used to select the pull-up time of the OUT signal after sensing. When P3 is floating or pulled high, the sensing pull-up time is 2 seconds.
when P3 is pulled low, the sensing pull-up time is 15 seconds.
If there is a new trigger during the inductive output pull-up period, the inductive time will be extended
Photosensitive detection
The module supports photosensitive detection.
The sample module does not enable the
photosensitive detection function by default.
The photosensitive threshold can be
adjusted by changing the photosensitive judgment threshold or tuning the photosensitive resistance.
In the version with photosensitive function, the radar sensor will be activated only when the
ambient light is lower than the set illuminance.
If the light is too bright, the module will not activate the sensor function.
(After the photodiode is mounted in a bright environment, the current consumption of the module will increase by about 5uA)
Module power-on
The module has a power-on self-check function, that is, after the module is powered on, the OUT pin first outputs a high level, and then outputs a low level after a delay of 2S, and enters the normal induction mode after a delay of 0.5S.
Detection range
The sensing sensitivity of the radar sensor can be configured by adjusting the resistance, and its positive limit sensing distance is 10 meters, and the actual sensing distance can be adjusted appropriately as needed.
Precautions
1. When installing the antenna, avoid metal shells or components on the front of the antenna to avoid shielding the signal.
Plastic or glass is allowed, but the obstruction should not be close to the front of the antenna.
2. Try to avoid directing the radar antenna to large metal equipment or pipelines
3. When installing multiple radar modules, try to ensure that the antennas of each radar module are parallel to each other, avoid direct illumination between the antennas, and keep a distance of more than 1m between the modules
4. The radar sensor should avoid facing the AC drive power supply and try to stay away from the rectifier bridge of the drive power supply to avoid power frequency interference with radar signals.
Datasheet: HLK-LD012-5G
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