Introduction

Rd-03_V2 is a radar module developed by Ai-Thinker, based on the S1KM0000 chip (an integrated millimeter-wave sensor SoC). It operates at the 24GHz K-band (single-frequency sweep modulation bandwidth of 1GHz).

  • Maximum sensing distance for moving human targets: 7m
  • Uses FMCW (Frequency Modulated Continuous Wave) technology to detect motion or micro-movements of human bodies in the sensing area, providing real-time detection results
  • Provides a visual configuration tool for easy setup of detection range, sensitivity in different zones, and no-person delay time
  • Supports automatic generation of detection thresholds, reducing manual calibration, improving detection accuracy, simplifying installation, and enabling large-scale deployment

Main Controller

The S1KM0000 is an integrated MCU millimeter-wave sensor SoC based on FMCW radar transceiver technology. It uses FMCW signals to detect targets in a defined space, combined with radar signal processing for high-sensitivity motion and micro-motion detection.

Features

  • DIP package with standard 2.54mm pin header, compatible with 2.0mm pin header
  • Supports 24GHz ISM band
  • 1T1R radar antenna, narrow beam, high resolution, wide bandwidth, strong anti-interference
  • Maximum sensing distance up to 7m
  • Wide detection angle, coverage up to ±60°
  • Accurate identification within sensing range, supports zone division, filters out interference outside target zone
  • Ultra-compact module size: 20x20mm, plug-and-play, real-time detection reporting
  • Intelligent radar parameter adjustment via serial port
  • Multiple installation methods: ceiling mount, wall mount
  • Automatic detection threshold generation
  • UART supported
  • Power supply: 3.3V/5V (3.0–3.6V or 4.5–5.5V); default 3.3V version
  • Average power consumption: 50mA

Applications

  • Human presence lighting control
  • Advertising display activation
  • Life safety protection
  • Smart appliances
  • Smart security
  • Smart lighting
  • New energy charging/parking monitoring facilities

Installation Guidelines

  • Ensure radar antenna faces the detection area with no obstruction
  • Secure installation; shaking affects detection performance
  • Avoid movement behind the radar; back-lobe signals may detect unintended objects. Use metal shielding if necessary
  • Detection distance may vary due to target size, posture, RCS, etc.
  • Avoid direct alignment of multiple 24GHz radars; install them apart to prevent interference
  • Keep antennas away from metals and high-frequency devices
  • Power input 3.0–3.6V; ripple within 100kHz should have no significant peaks

For more details: https://docs.ai-thinker.com/en/Rd-03_V2/

Testing

Two test methods: serial debugging and PC software debugging

Serial Debugging

  • Download and run Ai-Thinker Serial Debug Assistant
  • Use USB-to-TTL tool to connect module and PC
  • Configure serial parameters, open port, and receive distance data
  • Download and run PC tool software

 

PC Debugging

  • Download and run PC tool software
  • Select module COM port, set baud rate 115200
  • Click "Connect Device" to establish connection
  • Software displays firmware version, parameters, and real-time data
  • Maximum Distance: Sets effective detection distance (step = 0.7m, range: 0–10, accuracy: 0.1m)

Parameter Explanation

  • Maximum Distance: Sets effective detection distance (step = 0.7m, range: 0–10, accuracy: 0.1m)
  • Target Disappearance Delay: Delay before switching from “detected” to “not detected” state (range: 0–65535s)
  • Trigger Threshold (dB): Energy threshold for switching from “no person” to “person detected,” auto-calculated via software
  • Micro-motion Threshold (dB): Energy threshold for micro-motion detection

Real-time Data

  • Indicator light: Red = person detected; Green = no person
  • Distance data displayed in text box
  • “Start/Pause” button toggles detection
  • “Generate Threshold” scans noise and calculates detection thresholds
  • Motion/micro-motion graphs show real-time...
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