WitMotion HWT31 Accelerometer Inclinometer, SCA3300 Temp-Compensated, UART-TTL Output, Kalman Filter, XY 0.05° Angle

Overview

The WitMotion HWT31 is a compact accelerometer-based inclinometer module built around the SCA3300 high-stability, temperature-compensated acceleration chip. An onboard 8-bit MCU runs a Kalman filter and angle solver to output smooth roll/pitch (X/Y) angles together with X/Y/Z acceleration. The module communicates over UART (TTL level) and works with WitMotion PC software (Windows XP/7/8/10) and an Android app (via OTG + USB-TTL). It also provides dedicated alarm pins for X± and Y± thresholds.

Key Features

• Measured axes: Acceleration X/Y/Z; Angle (Roll/Pitch)

• Angle accuracy: X/Y ±0.05°

• Temperature compensation: Built-in (SCA3300)

• Digital filtering: Kalman filter with onboard 8-bit MCU angle calculation

• Interface: UART (TTL)

• Alarm I/O: X+ / X– / Y+ / Y– pins

• Software tools: Data record, curve display, dashboard, 3D model, configuration (Windows); Android app data view & logging

• Use cases: Robot attitude sensing, platform leveling, tilt alarms, AGV/AMR, instrumentation, education

Specifications (from images)

Dimensions

(All dimensions per drawing)

• A: 15.24 mm

• B: 15.24 mm

• C (pin pitch): 2.54 mm

• D: 12.7 mm

• E (height): 4.4 mm

Pinout

Notes: “TX ↔ RX, RX ↔ TX” when wiring to USB-TTL or MCU. Alarm pins correspond to X/Y positive/negative tilt alarm outputs as labeled.

PC & App Functions

• PC (Windows): data recording, real-time curves, dashboard gauges, 3D model view, and configuration.

• Android: parameter setup, live X/Y/Z and temperature display, and data record logging (via OTG + USB-TTL).

Typical Connections

• USB-TTL to PC: VCC → 5 V/3.3 V, TX↔RX, RX↔TX, GND → GND.

• Android (OTG): Phone OTG → USB-TTL → HWT31 (same wiring).

• MCU: VCC, RXD↔TX, TXD↔RX, GND.

Applications

• Platform leveling and tilt alarms

• Mobile robotics & AGV/AMR attitude/tilt sensing

• Industrial angle monitoring, instrumentation, education & R&D

Details

HWT31 Inclinometer with 3-axis acceleration, temperature compensation, roll pitch angle, 0.05° accuracy, Kalman filter, UART output.

High precision accelerometer with Kalman filter and angle calculation

Software displays real-time sensor data (acceleration, angle, magnetic fields). Setup uses OTG and USB-TTL for Android, with wiring diagram showing phone-to-module connections and labeled pins.

WitMotion HWT31 app interface displays settings, real-time angles, temperature, and data records. Connection diagram shows MCU interfacing through VCC, TXD, RXD, and GND pins for serial communication wiring.

WitMotion HWT31 accelerometer pinout: 12-pin layout with dimensions, UART interface, power supply, ground, and alarm signals for X, Y axes.