Seeed MR60BHA1 User manual

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1. Overview
The MR60BHA1 radar module uses 60G millimetre wave radar technology
to enable non-contact sensing of a persoAn's breathing rate and heart
rate.
This radar module has the following operating characteristics:
Implementation of radar detection based on FMCW FM continuous wave
signals.
Realization of simultaneous sensing of human respiratory rate and heart
rhythm.
Breathing heartbeat observation distance of 0.4-2 m
Low output power, which is not harmful to the human body
Independent of temperature, humidity, noise, airflow, dust, light and other
environmental influences.
product support for secondary development, adaptable to a variety of
scenarios applications.
Universal UART communication interface, providing a common protocol
4 groups of I\O reserved, according to user definition of input and output,
or do simple interface simulation.
2.Main parameters
2.1. detection angle and distance
Parameter content
Minimu
m
Typica
l
Maximu
m
Unit
Performance
Detection distance (thoracic)
0.4
2
m
Respiratory measurement accuracy
90
%
Heartbeat measurement accuracy
85
%
Refresh time
1
30
S
Observation set-up time
20
S

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Parameter content
Minimu
m
Typica
l
Maximu
m
Unit
Operating parameters
Operating voltage (VCC)
4.6
5
6
V
Operating current (ICC)
150
mA
Operating temperature (TOP)
-20
60
℃
Storage temperature (TST)
-40
80
℃
Launch parameters
Operating frequency (fTX)
58
60
63.5
GHz
Transmitted power (Pout)
6
dB
m
Antenna parameters
Antenna gain (GANT)
4
dBi
Horizontal beam (-3dB)
-40
40
o
Vertical beam (-3dB)
-40
40
o
)

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3. Module dimensions and pin description
3.1. Module size package
Fig. 1 Schematic diagram of the radar module structure

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3.2. pin descriptions
Interface
Pins
Description
Typical
values
Description
Interface
1
1
5V
5.0V
Positive power input
2
GND
Ground
3
RX
Serial port reception
4
TX
Serial port send
5
S1
3.3V/0V
occupied/unoccupied
6
S2
3.3V.0V
Stationary / Active
Interface
2
1
3V3
3.3V
Output power
2
GND
Ground
3
SL
Reserved
4
SD
Reserved
5
GP1
Spare expansion pins
6
GP2
Spare expansion pins
7
GP3
Spare expansion pins
8
GP4
Spare expansion pins
3.3. using the wiring diagram
Fig. 2 Schematic diagram of the radar module and peripheral connections

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4. Main operating properties
4.1 Radar module operating range
The radar module beam coverage is shown. The radar coverage is a three-
dimensional sector of 80° horizontally and 80° tilted.
Due to the radar beam characteristics, the radar has a relatively long range
in the direction normal to the antenna face, but a shorter range if it
deviates from the antenna normal.
When the radar is mounted on top or at an angle, the radar beam range
and the effective radiation space will reduce the radar range, which needs
to be taken into account when using the radar.
4.2. main functions and performance
Main functions and performance
a. Breath detection function
a) Detection distance.
i. 0.4m≤x≤2m// Detection distance between the chest cavity and the
radar antenna surface
b) Accuracy rate: ≥90%
b. Heartbeat detection function
a) Detection distance

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i. 0.4m≤x≤2m// Detection distance between the chest cavity and the
radar antenna surface
b) Accuracy: ≥85%
c. Presence sensing function
a) Detection distance: ≤ 3m // distance between antenna face and
person
b) Accuracy: ≥ 90%
d. Motion detection function
a) Motion triggering
b) Motion direction and position sensing
5. How the radar works and how it is installed
5.1. installation method
As the radar works mainly on the basis of the respiratory heart rhythm
causing undulating movements on the surface of the large muscles, the
undulation of the human chest and back will be more pronounced, so this
radar needs to be installed in the correct position to the human chest or
back.
Based on the radar mode of action, the following mounting options are
considered for radar installation.
(1) Overhead installation
The radar beam is positioned vertically downwards towards the body, with
the centre of the radar beam corresponding to the position of the body's
chest cavity.
In this installation mode, a distance of ≤ 2 m is required between the radar
and the body to be measured.

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Fig. 5 Schematic diagram of the ceiling mount
(2) Tilt mounting
With tilt mounting, the radar is fixed to a wall or bedside, the radar is
mounted at an angle (as shown in Fig. 6) and the radar beam is directed at
the body at an angle, with the centre of the radar beam corresponding to
the position of the human chest cavity.
In this installation mode, the radial distance between the radar and the
body to be measured is ≤ 2 m.
Fig. 6 Diagram of inclined installation

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(3) Horizontal installation
The radar is placed horizontally (as shown in Fig. 7), the radar is fixed to a
wall or placed on a table, the radar beam is directed towards the human
body and the centre of the radar beam corresponds to the position of the
human thorax.
The distance between the radar and the human body to be measured in
this installation mode is ≤ 2 m.
Fig. 7 Horizontal installation diagram
Fig. 8 Diagram of back mounting