Seeed Studio MR60BHA1 Heartbeat Detection Sensor User Guide
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    Seeed Studio MR60BHA1 Heartbeat Detection Sensor User Guide

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    Seeed Studio MR60BHA1 Heartbeat Detection Sensor

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    Seeed Studio MR60BHA1 Heartbeat Detection SensorSeeed Studio MR60BHA1 radar chip and antenna layout for accurate heartbeat sensing

    Introduction

    From hardware circuit reference design, radar antenna, and housing layout requirements, the Seeed Studio MR60BHA1 Heartbeat Detection Sensor helps distinguish interference and supports multi-functional standard UART protocol output. This radar is a self-contained system, consisting of an RF antenna, a radar chip, and a high-speed MCU, providing accurate and reliable heartbeat detection for various applications.

    Working Principle

    Seeed Studio MR60BHA1 sensor wiring diagram showing PCBA and supply voltage

    The radar transmits a 60 GHz millimeter wave signal, and the target reflects the electromagnetic wave signal, and demodulates it from the transmitted signal.

    For applications that require fall detection and advanced movement monitoring, Seeed Studio also offers the MR60FDA1 Fall Detection Pro Module, which can be integrated alongside the MR60BHA1 sensor for comprehensive human monitoring solutions.

    Hardware Design Considerations

    The rated supply voltage of the radar needs to meet 4.9 – 6V, and the rated current needs to be 200mA or more. Input is required. The power supply is designed to have a ripple of ≤ 100mv.

    Power supply can refer to the following circuit de. signSeeed Studio MR60BHA1 sensor non-metallic housing for optimized radar performance

    Handling Seeed Studio MR60BHA1 sensor safely with anti-static gloves

    Wiring DiagramUART frame structure diagram for Seeed Studio MR60BHA1 Heartbeat Detection Sensor

    Antenna and housing layout requirements

    For the Seeed Studio MR60BHA1 Heartbeat Detection Sensor, the PCBA should keep the radar patch height ≥ 1mm higher than other components. The housing structure must maintain a 2–5mm distance between the radar antenna surface and the housing surface. The housing detection surface should be non-metallic and straight to avoid bending, which could affect the overall performance of the sensor.

    Seeed Studio MR60BHA1 sensor measuring human heartbeat non-invasively

    Electrostatic Protection

    Proper handling of the Seeed Studio MR60BHA1 Heartbeat Detection Sensor is essential during transportation, storage, and operation to prevent static damage. Avoid touching the radar module antenna surface or connector pins directly; only handle the corners. Always wear anti-static gloves when handling the MR60BHA1 sensor to ensure safe and reliable operation.

    Detailed Explanation of Functions

    Function Description

    Function Status change time/function explanation
    DP1: occupied/unoccupied From unoccupied to occupied, report within 0.5s
    From occupied to unoccupied, report within 40s
    DP2: Some people are stationary / some people are active Static dynamic switching, report within 0.5 seconds
    DP3: Heart rate Outputs data once every 3 seconds, in units of times/minute
    DP4: Body movement parameters 0 – 100 Output data once every 5 seconds [Refer to: Body motion amplitude parameter output instructions].
    DP5: In-bed/out-of-bed From bed-out to bed-in, 1 1-minute report in the presence of someone

    From bed-in to bed-out, about 40s output of bed-out status
    DP6: Sleep state (awake/light sleep/deep sleep) In the bed state, 10 minutes to determine and report sleep status once
    DP7: Sleep quality score At the end of the sleep process, a score of 0 to 100 is reported for the sleep period.
    DP8: Respiratory/heart rate Outputs data once every 3 seconds, in units of times/minute

    Communication,, Command,, and Parameter Definition

    Definition of frame structure

    Frame header Control word Command word Length identifier Data Checksum End of frame
    0x53 0x59 Control Command Lenth_H Lenth_L Data Sum 0x54 0x43
    2 Byte 1 Byte 1 Byte 1 Byte 1 Byte n Byte 1 Byte 2 Byte

    Description of the frame structure

    The following frame structure applies to the Seeed Studio MR60BHA1 Heartbeat Detection Sensor:

    • Frame header: 2 Byte, fixed to 0x53,0x59;
    • Control word: 1 Byte (0x01 – heartbeat packet identification, 0x02 – product information, 0x03 – OTA upgrade, 0x05 – operation status, 0x07 – radar detection range information, 0x80 – human presence, 0x81 – breath detection, 0x84 – sleep monitoring, 0x85 – heart rate monitoring)
    • Command word: 1 Byte (to identify the current data content)
    • Length identification: byteste, equal to the specific byte length of the data
    • Data: n Byte, defined according to the actual function
    • Checksum: 1 Byte. (Calculation method of checksum: “frame header + control word + command word length identifier + data” summed to the lower eight bits)
    • End of frame: 2Byte, fixed to 0X54,0X43;

    Description

    Function Category Function Description Transfer direction Frame header Control word Command word Length

    Identification

    		Data Checksum field End of frame Note
    System Functions Heartbeat Pack Report Report 0x53 0x59 0x01 0x01 0x00 0x01 0F sum 0x54 0x43
    Heartbeat Package Inquiry Send 0x53 0x59 0x01 0x80 0x00 0x01 0F sum 0x54 0x43
    Response 0x53 0x59 0x01 0x80 0x00 0x01 0F sum 0x54 0x43
    Module Reset Send 0x53 0x59 0x01 0x02 0x00 0x01 0F sum 0x54 0x43
    Response 0x53 0x59 0x01 0x02 0x00 0x01 0F sum 0x54 0x43
    Information Inquiry
    Product Information Product Model Send 0x53 0x59 0x02 0xA1 0x00 0x01 0F sum 0x54 0x43
    Response 0x53 0x59 0x02 0xA1 0x00 len len B

    Product Info

    		 sum 0x54 0x43
    Product ID Send 0x53 0x59 0x02 0xA2 0x00 0x01 0x0F sum 0x54 0x43
    Response 0x53 0x59 0x02 0xA2 0x00 len len B

    Product ID

    		 sum 0x54 0x43
    Hardware Model Send 0x53 0x59 0x02 0xA3 0x00 0x01 0x0F sum 0x54 0x43
    Response 0x53 0x59 0x02 0xA3 0x00 len len B

    Hardware model

    		 sum 0x54 0x43
    Firmware Version Send 0x53 0x59 0x02 0xA4 0x00 0x01 0F sum 0x54 0x43
    Response 0x53 0x59 0x02 0xA4 0x00 len len B

    Firmware version

    		 sum 0x54 0x43

    Appendix

    About the calculation of the check digit 

    Let’s take the command to send a human presence information query as an example. The data construction for the presence information query was confirmed by the protocol table

    above is

    • Frame header: 0x53 0x59
    • Control word: 0x80
    • Command word: 0x81
    • Length identifier: 0x00 0x01
    • Data: 0x0F
    • Checksum: 1Byte (SUM)
    • End of frame: 0x54 0x43

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