TIDUED6B august   2018  – april 2023

 

  1.   Description
  2.   Resources
  3.   Features
  4.   Applications
  5.   Design Images
  6. 1System Description
    1. 1.1 Key System Specifications
  7. 2System Overview
    1. 2.1 Block Diagram
    2. 2.2 Design Considerations
      1. 2.2.1 mmWave Sensor
        1. 2.2.1.1 mmWave Sensor People Counting
        2. 2.2.1.2 IWR6843 UART Communication
          1. 2.2.1.2.1 IWR6843 Frame Output
          2. 2.2.1.2.2 IWR6843 Frame Header
          3. 2.2.1.2.3 TLV Elements
      2. 2.2.2 Power Supply Design
      3. 2.2.3 Wireless Network Design
      4. 2.2.4 CC1352 Software Design
        1. 2.2.4.1 Collector Node
        2. 2.2.4.2 Sensor Node
        3. 2.2.4.3 mmWave Sensor Configuration Command List Modification
    3. 2.3 Highlighted Products
      1. 2.3.1 IWR6843: Single-Chip 60- to 64-GHz mmWave Sensor
      2. 2.3.2 CC1352R: SimpleLink High-Performance Dual-Band Wireless MCU
      3. 2.3.3 IWR6843ISK and MMWAVEICBOOST: mmWave EVMs
      4. 2.3.4 LAUNCHXL-CC1352R1: SimpleLink™ Multi-Band CC1352R Wireless MCU LaunchPad™ Development Kit
  8. 3Hardware, Software, Testing Requirements, and Test Results
    1. 3.1 Required Hardware and Software
      1. 3.1.1 Hardware Setup
      2. 3.1.2 Software Setup
        1. 3.1.2.1 Loading the CC1352 Firmware
        2. 3.1.2.2 Loading the IWR6843 Firmware
        3. 3.1.2.3 Starting the Firmware
        4. 3.1.2.4 Building the Firmware
        5. 3.1.2.5 Viewing Collector Data Output
        6. 3.1.2.6 Modifying the mmWave Configuration
    2. 3.2 Testing and Results
      1. 3.2.1 Test Setup
        1. 3.2.1.1 People Counting Setup
        2. 3.2.1.2 Power Consumption
        3. 3.2.1.3 Wireless RF Range
      2. 3.2.2 Test Results
        1. 3.2.2.1 People Counting Test Results
        2. 3.2.2.2 Power Characterization
        3. 3.2.2.3 Wireless RF Range Results
  9. 4Design Files
    1. 4.1 Schematics
    2. 4.2 Bill of Materials
    3. 4.3 PCB Layout Recommendations
    4. 4.4 Altium Project
    5. 4.5 Gerber Files
    6. 4.6 Assembly Drawings
  10. 5Software Files
  11. 6Related Documentation
  12. 7Trademarks
  13. 8About the Author
  14. 9Revision History

3.2.1.1 People Counting Setup

For best results, the sensor node should be positioned high enough to be above the top of tracked objects and with a slight down tilt. The aim is to position the sensor node so that the antenna beam can encompass the area of interest. If the down tilt is too severe, noise from ground clutter increases and the effective sensing area decreases. If there is no down tilt, counting performance would be worse for cases in which one person is in line with and shielded by another person. Given the antenna radiation pattern of the sensor node, consideration should be taken to not mount the sensor node too close or oriented with the beam directed to the ceiling as this can increase the noise floor and result in less optimal performance.

GUID-23B95C6C-230E-4490-8A9F-5B468011F75F-low.png Figure 3-19 Sensor Node (IWR6843 + CC1352) Setup

Setup Requirements:

  • Elevate Sensor Node 1.5–2.5 m high
  • Down tilt: approximately 10 degrees

Setup using suggested tripod and smartphone clamp mount:

  1. Screw on clamp mount to tripod
  2. Clamp the sensor node across its width below the power barrel jack to attach sensor node.
  3. Adjust the tripod head for approximately 10 degree downward tilt (Tip: Bubble or level smartphone applications can be used to measure down tilt)
  4. Plug in the 5-V power supply to the sensor node
  5. Extend the tripod so that the sensor node is elevated 1.5–2.5 m from the ground
  6. Position the sensor node and tripod assembly in the desired location of room. The sensor node should be positioned so that the 120 degree FOV of the radar antenna encompasses the area of interest and points to the region in which people are expected to enter the space.
GUID-F3965F34-ECC4-4644-9208-6BB93FA54B97-low.png Figure 3-20 Setup with Clamp Mount