seeed studio MR60BHA1 User manual

MR60BHA1
60GHz mmWave Module - Respiratory
Heartbeat Detection
Sensor User Manual (V2.3)

Contents
Overview........................................................................ 2
1. Working principle .............................................................. 3
2. Hardware Design Considerations .................................................. 3
2.1. The power supply can refer to the following circuit design ......................... 3
2.2. Use wiring diagrams ....................................................... 4
3. Layout Requirements for Antenna and Housing....................................... 4
4. Static Protection ............................................................... 5
5. Detailed function............................................................... 5
5.1. Function point description ................................................... 5
6. Protocol description ............................................................ 6
7. Communication command and parameter definition ................................... 6
7.1. Frame structure definition and description ...................................... 6
7.2. Address allocation and data information description............................... 7
Appendix 1 : About Data Command Generation Routines................................. 24
8. Historical version update instructions.............................................. 25

Overview
This document mainly describes how to use the module of MR60BHA1 to develop a product and
explain the problems should be paid attention to during the process. The manual can help to reduce the
design cost and increase the stability of the product, which can improve the efficiency of development.
From the hardware circuit reference design, the layout requirements of the radar antenna and the
housing, how to distinguish the interference and the multi-function standard UART protocol output.
This module is a self-developed air sensing device, which is composed of a radio frequency antenna,
radar chip and high-speed main frequency MCU. It relies on a stable, flexible and superior algorithm
architecture to solve users' various detecting requirements. It can be used with a host computer
software or a host to flexibly output detection status and data. It contains several groups of GPIOs,
which can satisfy user-customized development requirements.

1. Working principle
radar transmits a 60 G-band millimeter wave signal, and the measured target reflects the
electromagnetic wave signal,and demodulates the transmitted signal, and then processes it through
amplification, filtering, and ADC to obtain echo demodulated signal data. In the MCU unit, the
amplitude, frequency, and phase of the echo signal are calculated, and the target parameters ( sleep
quality, breathing, turning over, body movement , etc.) are measured and the scene evaluation is finally
realized.
2. Hardware Design Considerations
The radar's rated power supply voltage needs to meet 4.9 - 6V, and under normal working conditions,
the rated current requires an input of more than 200mA. Power supply design, power supply ripple
should be≤ 100mv.
2.1. The power supply can refer to the following circuit design
figure 1

figure 2
2.2. Use wiring diagrams
Figure 3 Schematic diagram of the connection between the radar module and the peripherals
3. Layout Requirements for Antenna and Housing
PCBA: Need to keep the height of the radar patch ≥ 1mm than other devices
Shell structure: It is necessary to maintain a distance of 2 - 5mm between the radar antenna
surface and the shell surface
Shell detection surface: non-metallic shell, need to be straight to avoid curved surface, affecting
the performance of the entire scanning area
Figure 4
MR60BHA1

4. Static Protection
Radar products have static-sensitive circuits inside, which are prone to electrostatic hazards.
Therefore, it is necessary to fully protect against static electricity during transportation,
storage, work and handling. Do not touch and grab the radar module antenna surface and
connector pins. Only touch its corners.
Wear anti-static gloves as much as possible when handling the radar sensor.
5. Detailed function
5.1. Function point description
function points
State change time/function explanation
DP1: Someone/Nobody
No one to someone, report within 0.5s
From someone to no one, 40 s output no one state
DP2: Someone is stationary / Someone is
active
Static and dynamic switching, reporting within 0.5 seconds
DP3: Heartbeat rate
Output data once every 3 seconds, the unit is times/minute
DP4: Body Motion Amplitude Parameter 0 –
100
Output data once every 5 seconds [Reference: Description of Body
Motion Amplitude Parameter Output]
DP5: Getting in/Out of bed
From getting out of bed to getting in bed, someone exists to report
within 1 minute
From bed entry to bed exit, the exit state is output in about 40s
DP6: Sleep state (awake/light/deep)
When in bed, judge and report the sleep state once every 10 minutes
DP7: Sleep Quality Score
At the end of the sleep process, report the score of this segment of
sleep, with a score ranging from 0 to 100 points.
DP8: Respiratory/Heart Rate Rate
Output data once every 3 seconds, the unit is times/minute

6. Protocol description
This agreement applies to 60G Communication between the millimeter wave breathing and sleep
detection radar and the host computer.
This protocol briefly introduces the radar workflow, briefly introduces the structure of the interface
protocol, and gives the control commands and data required for the related radar work. The serial port
communication is defined as follows:
Interface level: TTL
Baud rate: 115200 bps
Stop bit: 1
Data bits: 8
Parity: None
7. Communication command and parameter definition
7.1. Frame structure definition and description
A. frame structure definition
frame header
control word
Command word
length identification
data
check code
end of frame
0X53 0X59
Control
Lenth_H
Command
Lenth_H
Lenth_H
Data
Sum
0X54 0X43
2 Bytes
1 Byte
1 Byte
1 Byte
1 Byte
1 Byte
nByte
1 Byte
1 Byte
2 Bytes
B. frame structure description
a. Frame header: 2Byte, fixed at 0X53, 0X59;
b. Control word : 1 Byte
(0x0 1 - heartbeat packet identification, 0x0 2 - product information, 0x0 3 - OTA upgrade, 0x05
- working status, 0x07 - radar detection range information, 0x8 0 - human presence, 0x81 -
breathing detection, 0x84 - sleep monitoring, 0x85 - heart rate monitoring)
c. Command word : 1Byte ( identify the current data content )
d. Length identification : 2Byte, equal to the specific byte length of the data
e. Data: nByte, defined according to the actual function
f. Check code: 1 Byte,
(Check code calculation: frame header + control word + command word + length identifier +
data) After summing, take the lower eight bits)
g. Frame end : 2 Byte, fixed at 0X54, 0X43;

7.2. Address allocation and data information description
Product
Category
Function
Descript
ion
Trans
missio
n
directi
on
fram
e
heade
r
contr
ol
word
Comm
and
word
length
identifi
cation
data
check
field
end
of
frame
Remark
System
function
s
Heartbea
t packet
report
report
5359
01
01
0001
OF
sum
5443
Heartbea
t packet
query
Issued
5359
01
80
0001
OF
sum
5443
Reply
5359
01
80
0001
OF
sum
5443
Module
reset
Issued
5359
01
02
0001
OF
sum
5443
report
5359
01
02
0001
OF
sum
5443
Product
model
report
report
5359
02
01
len
len B product
information
sum
5443
Product
ID report
report
5359
02
02
len
len B product
id
sum
5443
Hardwar
e model
report
report
5359
02
03
len
len B
hardware
model
sum
5443
Firmwar
e version
report
report
5359
02
04
len
len B
firmware
version
sum
5443
Information query
Product
model
query
Issued
5359
02
A1
0001
OF
sum
5443
Reply
5359
02
A1
len
len B Product
Information
sum
5443

product
informa
tion
product
id query
Issued
5359
02
A2
0001
OF
sum
5443
Reply
5359
02
A2
len
len B product
id
sum
5443
Hardwar
e model
query
Issued
5359
02
A3
0001
OF
sum
5443
Reply
5359
02
A3
len
len B
hardware
model
sum
5443
Firmwar
e version
query
Issued
5359
02
A4
0001
OF
sum
5443
Reply
5359
02
A4
len
len B
firmware
version
sum
5443
working
status
Initializat
ion
complete
informati
on
report
5359
05
01
0001
OF
sum
5443
Whether
the
initializat
ion
complete
s the
query
Issued
5359
05
81
0001
OF
sum
5443
Reply
5359
05
81
0001
01:
Completed
02: Not
completed
sum
5443
Radar
detection
range
informati
on
Location
out-of-
bounds
status
report
report
5359
07
07
0001
00: Out of
range
01: In range
sum
5443
Reporting method: when
the status changes
Location
out-of-
bounds
status
query
Issued
5359
07
87
0001
OF
sum
5443
Reply
5359
07
87
0001
00: Out of
range
01: In range
sum
5443
human body report

Switch
the
human
presence
function
Issued
5359
8 0
00
0001
01: On
00: Off
sum
5443
Reply
5359
8 0
00
0001
01: On
00: Off
sum
5443
human
body
function
Actively
report
existence
informati
on
report
5359
80
01
0001
00: no one
01: no one
sum
5443
Reporting method: report
when the status changes
Active
reporting
of sports
informati
on
report
5359
80
02
0001
00: None
01: Still
02: Active
sum
5443
Reporting method: report
when the status changes
Active
reporting
of
physical
activity
paramete
rs
report
5359
80
03
0001
1B Body
Movement
Parameters
sum
5443
Reporting method: report
once every 1s
Value range: 0-100
Active
reporting
of human
distance
report
5359
80
04
0002
2B Human
distance
sum
5443
Reporting method:
Report once every 2 s
Value range: 0-65535
Unit: cm
Active
reporting
of body
position
report
5359
80
05
000 6
6B (2B:x,
2B:y, 2B:Z)
Body
Orientation
sum
5443
Reporting method: report
once every 2s
Unit: cm
position information has
positive and negative, the
first 0 of 16-bit data
means positive, and the
first 1 means positive
Information query
Query
Issued
5359
8 0
80
0001
OF
sum
5443