SLAAE30 July   2021 MSP430FR2355

 

  1.   Abstract
  2.   Trademarks
  3. 1PIR Design Description
    1. 1.1 PIR Sensor
    2. 1.2 PIR Signal Chain
      1. 1.2.1 Traditional Motion Detection Signal Chain Design
      2. 1.2.2 Capacitor-Free Signal Chain Design
  4. 2Software
    1. 2.1 Software Architecture
    2. 2.2 Software Flow Chart
    3. 2.3 Power Profile
    4. 2.4 Data Processing
      1. 2.4.1 Digital Signal Conditioning
      2. 2.4.2 Low-Pass Filter for Temperature Drift
      3. 2.4.3 Spikes and Noise
      4. 2.4.4 Motion Detection Function
  5. 3Hardware and Schematic
    1. 3.1 MSP430FR2355
    2. 3.2 Schematic
  6. 4Results
    1. 4.1 Distance: 15 ft (4.5 m)
    2. 4.2 Distance: 22.5 ft (6.9 m)
    3. 4.3 Distance: 36.5 ft (11.1 m)
  7. 5Summary
  8. 6References

4.3 Distance: 36.5 ft (11.1 m)

At this distance, the amplitude from the motion events have shrunk substantially, but the motion is still clear in the wave form and clearly stands out vs the small RMS noise. These motion events were still correctly detected by the MSP430.

GUID-A58F307A-6563-4D1D-8F31-56AF6FB08EBC-low.png Figure 4-5 Adult at 36.5 ft (11.1 m), speed 1 m/s
GUID-0FA1C970-BAE5-4213-B4FE-8225DA5DAFD9-low.png Figure 4-6 Child at 36.5 ft (11.1 m), speed 1 m/s