Horse Movement Monitoring Overview

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Project Overview
This design is a chest-mounted wearable module for monitoring body movement using a Bosch BHI160B 6-axis sensor over I²C. Key elements include:
  • Power & Decoupling
    • 3.3 V input via the +3V3 net portal
    • Three decoupling caps: C1, C2 on VDD, and C3 on the internal VREG
  • Sensor
    • U1: BHI160B 6-axis IMU (accelerometer + gyroscope)
  • I²C & AUX Interfaces
    • Main I²C (SDA/SCL) exposed on the 4-pin connector J1
    • Sensor-hub AUX SDA/SCL exposed on the 6-pin header J2
    • Pull-ups: R1 & R2 on AUX lines
  • Address Selection
    • Address-select network using R3 & R4 on the SEL_ADR pin
Limitations for Chest-Mounted Equine Monitoring
  • Lack of On-Board Power Source
    Requires an external 3.3 V supply—no integrated battery or regulator is provided.
  • No Wireless or Data Logging
    All data must be read via wired I²C; there’s no microcontroller, flash memory, or radio on-board.
  • Mechanical & Environmental Protection
    No enclosure, waterproofing, or shock-proofing; raw PCB may not withstand sweat, mud, or impact during riding/galloping.
  • Orientation & Mounting Sensitivity
    Without a defined housing or alignment jig, sensor orientation may vary, complicating consistent motion analysis.
  • Accelerometer Range & Bandwidth
    The BHI160B’s built-in ±16 g range and its sampling rate may not capture very high-impact events without saturation or aliasing.
  • No Input/ESD Protection
    I/O lines are exposed directly—no TVS diodes or series protection, risking damage from static or voltage spikes.
  • Thermal & Calibration Drift
    No temperature sensor or compensation network; prolonged exposure to outdoor conditions could introduce measurement drift.
  • No Filtering Beyond Decoupling
    High-frequency noise on I²C lines or sensor outputs may require additional RC or ferrite filtering for cleaner data.
121 days

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+3V3
C3
Capacitance
0.47u F
R3
Resistance
DNP Ω
+3V3
C2
Capacitance
0.1u F
+3V3
SCL
SEL_ADR
+3V3
C1
Capacitance
0.1u F
SDA
SEL_ADR
AUX_SDA
R4
Resistance
0 Ω
GPIO2
+3V3
AUX_SCL
AUX_SCL
AUX_SDA
R2
Resistance
4.7k Ω
INT
R1
Resistance
4.7k Ω
GPIO1
U1
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Wearable Accelerometer BHI160B Template

Wearable Accelerometer BHI160B Template
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Last updated by quinnie
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quinnie

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