Overview
WitMotion WT31N Inclinometer is a miniature MEMS module that measures 3-axis acceleration (X/Y/Z) and computes dual-axis angle (roll & pitch on X/Y) with an onboard Kalman filter and 8-bit MCU. It outputs time, acceleration, and angle over UART (TTL) at up to 100 Hz. Designed for compact embedded projects, it supports 3.35 V systems and connects easily to PCs (USB-TTL) or Android phones (OTG + USB-TTL).
Note: the WT31 reports X/Y angles only; no Z-axis angle (no gyroscope on the module).
Key Features
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Acceleration: X/Y/Z axes
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Angles: X (roll), Y (pitch)
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Static angle accuracy: 0.1 (X/Y)
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Filter/solver: Kalman filter, onboard angle calculation (AHRS-style output for X/Y)
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Output interface: UART (TTL), 115200 baud (TXRX cross)
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Update rate: 100 Hz
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Supply & draw: 3.35 V, <10 mA
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PC software: data recording, dashboard/3D module, curve display (Windows XP/7/8/10)
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Android app: configuration, calibration, live data & recording (via OTG + USB-TTL)
Specifications
| Item | Value |
|---|---|
| Product name | WT31 Inclinometer |
| Brand | WitMotion |
| IC | STM8 + LIS3DH |
| Supply voltage | 3.3 V 5 V |
| Current | <10 mA |
| Output data | Time, Acceleration, Angle |
| Axes | ACC: X/Y/Z; Angle: X/Y (roll/pitch) |
| Acceleration range | 16 g |
| Angle range | X: 90, Y: 90 |
| Acceleration resolution | 0.0005 g |
| Static angle accuracy | 0.1 (X/Y) |
| Dynamic angle | Not applicable (no gyro) |
| Update rate | 100 Hz |
| Interface | UART (TTL) |
| Baud rate | 115200 |
| Size | 15.24 mm 15.24 mm 2 mm |
| Weight | 0.34 g |
| Note | No Z-axis angle because no gyroscope |
Dimensions (board)
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A = 15.24 mm, B = 15.24 mm, C = 2.54 mm, D = 12.7 mm, E = 2 mm (per drawing)
Pin Definition
| No. | Name | Function |
|---|---|---|
| 1 | D0 | |
| 2 | VCC | 3.35 V |
| 3 | RX | UART-TTL Receiver |
| 4 | TX | UART-TTL Transmitter |
| 5 | GND | Ground |
| 6 | D1 | |
| 7 | D2 | X+ alarm |
| 8 | VCC | 3.35 V (second pad) |
| 9 | S1 | Y+ alarm |
| 10 | S2 | Y- alarm |
| 11 | GND | Ground |
| 12 | D3 | X- alarm |
Connection tips
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MCU: VCCVCC, TXRX, RXTX, GNDGND.
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PC: connect via USB-TTL adapter.
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Android: OTG + USB-TTL adapter.
Software & App Functions
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Data record and export
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3D module / dashboard visualization
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Real-time data curve display
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Config & calibration menus in app
Typical Applications
IoT tilt monitoring, UGV/robot leveling, mapping rigs, environmental/structural monitoring, energy equipment alignment, and building protection where compact accelerometer + inclinometer data and UART-TTL output are required.
Details
MEMS IMU for IoT, environmental monitoring, UGV, energy, mapping, and building protection. WT31 Inclinometer offers 0.1 accuracy, Kalman filter, UART output, and measures acceleration, angular velocity, and angle.
High precision inclinometer with Kalman filter and 8Bit MCU
PC software features: data record, 3D module, curve display, dashboard, configuration, compatible with Windows XP/7/8/10. Connection: VCC TX RX GND connected to USB-TTL +5V/3V3 RX TX GND; TX to RX, RX to TX.
Software displays real-time sensor data (acceleration, angle, magnetic fields). Requires OTG and USB-TTL for Android devices, with wiring details and interface layout for module setup and calibration.
WitMotion WT31N inclinometer app displays settings, real-time data, and logs. Connection diagram shows MCU interface with VCC, TXD, RXD, GND pins for serial communication.
WitMotion WT31 inclinometer, 0.34g, STM8+Lis3dh IC, 3.3V-5V, <10mA, 15.2415.242mm. Outputs acceleration, angle data via UART (TTL) at 115200bps, 100Hz rate. No Z-axis angle due to no gyroscope.
Pin definition for WitMotion WT31N inclinometer, including dimensions and functions of 12 pins, with UART TTL interface and alarm signals.
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