24G Biosensing Radar Human Presence - R24A User Manual(Ver.1.1)Reference 云帆瑞达科技（深圳）有限公司 TEL: 0755-88602663 广东省深圳市福田区车公庙苍松大厦北座 1708 sales@iotrda.com www.iotrda.
Contention 1. Working principle ............................................. 4 2. Hardware design considerations ................................ 4 2.1. Power supply can refer to the following circuit design .... 5 2.2. Use the wiring diagram .................................... 5 3. Layout requirements for the antenna and enclosure ............. 6 4. Electrostatic protection ...................................... 6 5. Function interference items ................................... 7 5.
as possible to reduce the design cost and increase the stability of the product, and improve the completion efficiency of the project 。 From the hardware circuit reference design, radar antenna and shell layout requirements, how to distinguish interference and multi-functional standard UART protocol output. This radar is a self-contained airborne sensing sensor, a module composed of a radio frequency antenna, a radar chip and a high-speed main frequency MCU.
1. Working principle The radar transmits the 24G frequency band millimeter wave signal, the electromagnetic wave signal reflected by the measured target, and performs demodulation processing at the transmitting signal, and then proceeds through the amplification, filtering, ADC, etc., to obtain the echo demodulation signal data. The amplitude, frequency and phase of the echo signal are calculated in the MCU unit, and finally realize the target parameters (breathing, motion, micromotion, etc.
2.1. Power supply can refer to the following circuit design Figure 1 Figure 2 2.2.
3. Layout requirements for the antenna and enclosure PCBA: needs to maintain radar patch higher than other devices ≥ 1mm Housing structure: Keep radar antenna surface at 2-5mm distance Shell detection surface: non-metallic shell, need to be straight to avoid bending surface and affect the performance of the whole sweep area. 图 4 4. Electrostatic protection Radar products have an electrostatic sensitive circuit, which is prone to electrostatic hazards.
5. Function interference items 5.1 Unmanned state, the abnormal output of someone In the normal state, the radar will accurately judge the human sitting state and the existence of sleep, and output falls, breathing, vital signs and other information A. Radar scanning area is large, the door, next door to the plank wall movement was detected Adjustment method: Reduce the radar sensitivity, and the radar provides the scene setting B.
A. The human body is outside the radar range Radar scanning range, and adjust the installation angle.Radar measurement range, in different environments, the electromagnetic wave reflected area is different, the scanning area will have small differences. B. Metal occlusion causes an incorrect output Overthick office tables and chairs, metal seats.It will block the electromagnetic wave penetration, causing misjudgment. C. Scan angle difference The radar was not scanned to the trunk position.
DP7：Scene mode (bed, bathroom, hotel, Bedroom, Office, Default mode) Adapt to different scenes according to the size of the face shell DP8：No false alarm confirmation prompt 6.2.
B、Frame structure description a. Start code: 1Byte, is fixed to 0X55。 b. Data length: 2 Byte, low bytes in front, high bytes in back Length = data length + function code + address code 1 + address code 2 + data + check code。 c. Function code：1Byte Read r command：0X01 Write command：0X02 Passive report command：0X03 Active reporting command：0X04 d. Address code: Address code 1 indicates the function classification, and the address code 2 indicates the specific function.
WARNING: Changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment. RF Exposure The equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment. This device should be installed and operated with minimum distance 20cm between the radiator & your body.
