seeed studio R24BBD1 Bedienungsanleitung
Table of Contents
Overview 3
1. Principle of operation 3
2. Hardware Design Considerations 4
2.1 The power supply can be designed with the following circuit in mind4
2.2 using the wiring diagram 5
3. Antenna and housing layout requirements 5
4. Static Protection 6
5. Functional disturbances 6
5.1 Unoccupied state, abnormal output occupied 6
5.2 Manned status, abnormal output unoccupied 7
6. Functions in detail 8
6.1 Function point descriptions 8
6.2 Description of the output of the body motion amplitude parameter 9
7. Description of the agreement 9
8. Communication commands and parameter definitions 10
8.1 Definition and description of the frame structure 10
8.2 Description of address assignment and data information 11
Overview
This manual primarily describes the practical application of the radar system and
the issues that should be addressed at each stage to minimize design costs,
increase product stability, and improve project efficiency.
This manual talks about the hardware circuit reference design, the radar antenna
and shell layout requirements, and the use of a multifunctional standard UART
protocol.
The radar is a self-contained space-sensing sensor consisting of an RF antenna,
a radar chip, and a high-frequency multi-core processor. To meet the diverse
needs of users, it is built on a stable, flexible, and superior algorithmic
architecture core. It can be connected to a remote or host computer so that the
status and detection data can be sent in various ways. It also has several groups
of GPIOs that allow the user to customize the development.
1. Principle of operation
The radar transmits a 24G band millimeter-wave signal, the measured target
reflection electromagnetic wave signal, demodulates the transmitted signal, and
then obtains echo demodulation signal data through amplification, filtering, ADC,
and other processes. The echo signal's amplitude, frequency, and phase are
decoded in the MCU unit, which ultimately enables the measurement of the
target parameters (breathing, motion, tiny motions, etc.).
2. Hardware Design Considerations
The standard voltage power supply and input current of the radar under normal
circumstances should be 4.9–6V and 200 mA, respectively. Power supply design,
power ripple ≤ 100mV.
2.1 The power supply can be designed with the following circuit in mind
Fig. 1
Fig. 2
2.2 using the wiring
diagram
Fig. 3 Schematic diagram of the radar module and peripheral connections
3. Antenna and housing layout requirements
PCBA: Mount the radar ≥1mm higher than the other devices.
Case: Keep 2-5mm between the radar antenna and other shell surfaces.
Case detection surface: To avoid coverage area performance, keep the non-metallic
case flat and straight to avoid bending.
Fig. 4 Schematic diagram of the radar module and peripheral connections
4. Electrostatic (ESD) protection
Radar modules contain electrostatic-sensitive circuits, so they risk electrostatic shocks.
Thus, it is essential to maintain proper electrostatic protection throughout the process of
transportation, storage, work, and handling. Avoid touching the radar module's antenna
surface and connector pins, but hold the corners. We recommend that you wear anti-
static gloves during the operation of the radar sensor.
5. Function interference item
5.1 Unoccupied state, abnormal output occupied
When the radar is in its normal state, it will accurately determine the existence of human
sitting or sleeping states and will output fall data, breathing information, vital signs, etc.
a. Radar scanning covers a large area. You can detect movement around the
doorway and the next door in the wooden wall.
Adjustment method: Reduce radar sensitivity; the radar has scene settings
b. When the radar is facing toward the air conditioner and fan when it is
operating
Adjustment method: Position the radar so it doesn't directly face the air
conditioner and fan
c. Object shaking caused by air conditioning wind
Adjustment method: Cotton and non-metallic items do not cause false
alarms. Metal items should be well-positioned to avoid interference.
d. If the radar is not fixed, vibration may cause false alarms. To prevent this
from occurring, support the radar in a fixed position to avoid vibrations and
shakes.
e. Occasional moving objects, such as pets, birds, or other animals.
Because of the high sensitivity of the radar's detection of micromotions,
this interference cannot be eliminated.
f. Power supply interference can interfere with judgment, resulting in
occasional errors.
Maintain a stable current power supply and minimize ripple.
5.2 Occupied status, abnormal output unoccupied
Radar can determine whether a human body exists by transmitting and receiving
electromagnetic waves. The closer the body is to the radar, the higher the accuracy is.
a. The human body is out of radar’s range.
Adjust the installation angle to fit the range of the radar.
Measurement range: the electromagnetic wave reflection area is different in
different environments, and the scanning area may be slightly different.
b. Output error due to metal shielding
Thick office desks and chairs and metallic seats. This will block electromagnetic
waves from penetrating and causing inaccurate judgments.
c. The difference in scanning angle.
When the radar fails to detect the body part (torso area), it can cause errors.
d. The radar’s sensitivity is too low
The radar can be adjusted in order to improve sensitivity.
6. Functions details
6.1 Function point descriptions
Functions
Status change time/function
explanation
DP1: occupied/unoccupied
No one to occupied, report within 0.5s
Manned to unoccupied, no status
output in 1-2 minutes or so
DP2: Some people are stationary /
Some people are active
Static dynamic switching, reporting
within 0.5 seconds
DP3: Someone close to the device
/ someone moving away from the
device / someone moving without
direction
Status output once every 2 seconds
DP4: Body movement amplitude
Data output once every 5 seconds
Functions
Status change time/function
explanation
parameter 0 - 100
Reference (description of output of
body motion amplitude parameters)
DP5: Sensitivity setting 1 - 10
steps
Default scene mode, adapted to 10
positions of adjustment
DP6: Scene modes (bed,
bathroom, hotel, bedroom, office,
default mode)
Adapted to different scenarios
according to the size of the area
DP7: No false alarm confirmation
prompt
DP8: Sleep parameter switch
Off by default, sleep function only
works when on
DP9: Bed entry/exit
Output status in 3S clock
DP10: Number of bed entries/exits
Count the number of times you
enter/leave bed in a day
DP11: Stationary dwell alarms
Outputs in three states, once every 10
minutes
DP12: Length of Sobriety
DP13: Length of light sleep
DP14: Length of deep sleep
DP15: Breathing rate
Normal number of breaths can be
tested
DP16: Breathing rate detection
signal
If there are factors such as distance,
range and other effects, output
breath-holding abnormalities, good
signals, abnormal movements,
Functions
Status change time/function
explanation
abnormal states of shortness of
breath
DP17: Sleep scoring (optional,
users can rate according to their
own way)
Combined day's sleep rating
6.2 Description of the output of the body motion amplitude parameter
Body movement amplitude parameters
0%
None
Environmental
unmanned
1%
Stationary (sleep)
Only breathing
without body
movement
2% - 30%
Micro-Movements
Only minor head or
limb movements
Movement
31% - 60%
Walking/fast body
movements
Slower body
movements
61% - 100%
Running/close range big
moves
Rapid body movement
7. Description of the agreement
This protocol is used for communications between a millimeter-wave sleep detection
radar and a host computer. The protocol outlines the radar’s workflow describes the
interface protocol's composition architecture and provides the commands and data
necessary for the relevant radar function. The serial port is defined as the following:
Interface level: TTL
Baud rate: 9600bps
Stop bits: 1
Data bits: 8
Parity: None
8. Communication commands and parameter definitions
8.1 Definition and description of the frame structure
Frame structure definition
Starting
Code
Length of data
Function
codes
Address
code 1
Address
code 2
Data
Check Code
0X55
Lenth_L
Lenth_H
Command
Address_1
Address_2
Data
Crc16_L
Crc16_H
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
n Byte
1 Byte
1 Byte
Starting
Code
Length
of data
Function
codes
Address
code 1
Address
code 2
Data
Check
Code
Frame structure description
a. Start code: 1 Byte, fixed to 0X55.
b. Data length: 2 Byte, low byte before, high byte after. Length = Data Length +
Function Code + Address Code 1 + Address Code 2 + Data + Checksum.
c. Function code: 1 Byte
Read command: 0X01
Write command: 0X02
Passive report command: 0X03
Active report command: 0X04
d. Address code:
Address code 1 indicates the functional classification.
The address code 2 indicates the specific function.
Refer to the address assignment and data information description.
e. Data: n Byte
f. Checksum: 2 Byte, low byte before, high byte after.
CRC16 checksum is used. Refer to Appendix 1 for reference codes
Dieses Handbuch passt für folgende Modelle
2
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