seeed audio 24GHz mmWave Sensor User Manual

24GHz mmWave Sensor – Human Static
Presence Module Lite
User Manual and User Protocol

Product Overview

Statement

This document is the user manual for the 24GHz mmWave Sensor – Human Static Presence Module Lite and covers its use.

Electrostatic Protection

This radar product have electrostatic sensitive circuits inside, which is easily caused the problem by electrostatic hazards. Therefore, it is necessary perform electrostatic protection in the process of transportation, storage, working and taking. Please do not touch the surface of radar module antenna and connector pins with your hands, but only touch the corners. And please wear antistatic gloves when operating the radar sensor.

Part List

24GHz mmWave Sensor – Human Static Presence Module Lite x1

Software

Upper Computer Software(Windows)
Quick Start

Hardware Connection

The following figure illustrates the connection method.

Examples:

1. Hardware connection for using upper computer software.
2. Hardware connection for using Arduino library.

Getting Started

The getting started tutorial is published by Seeed Studio and you can refer to here for further information.

FAQ

How long is the initialization time?
– When the module is initially powered on and started to work, the internal circuit of the module needs to be completely reset and the ambient noise needs to be fully evaluated to ensure the normal operation of the module. Therefore, during the initial power-on of a module, ensure that the steady start time is at least 30 seconds to ensure the validity of subsequent output parameters.
Why do detections sometimes fail?
– Since human biometric features belong to ultra-low frequency and weak reflection characteristic signals, radar processing requires relatively long- term cumulative processing.
– In the cumulative process, many factors may affect radar parameters, so occasional detection failure is normal.

User Protocol

This protocol is applied to the communication between the radar and the upper computer.
The control commands and data required for radar operation are defined as follows:

• Interface levels: TTL
• Baud Rate: 115200 bps
• Stop Bit: 1
• Data Bit: 8
• Parity Check: no

Communication Command and Parameter Definition
This radar contains two output functions:

• Standard Function
• Open Underlying Function

Frame Structure Definition and Description

Head| Control| Command| Length| Data| Check| Tail
---|---|---|---|---|---|---
2 bytes| 1 byte| 1 byte| 2 bytes| n bytes| 1 byte| 2 bytes

• Head: 2 bytes, fixed as 0x53 and 0x59;
• Control: 1 byte
  • 0x01- Heartbeat Packet Identifier
  • 0x02- Product Information
  • 0x03-OTA Upgrade
  • 0x05- Working Status
  • 0x80- Human presence
• Command: 1byte – identify the current data content
• Length: 2 bytes, equal to the data length in bytes
• Data: n bytes, defined according to the actual function
• Check: 1 byte
  • Check code calculation: Take the sum of (Head + Control + Command + Length + Data) In hexadecimal, and then take the lower eight bits.
• Tail: 2 bytes, fixed as 0x54 and 0x43.

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