USER MANUAL WT901BLECL BLE5.0 Bluetooth 5.0 Inclinometer Sensor WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
Tutorial Link Google Drive Link to instructions DEMO: WITMOTION Youtube Channel WT901BLECL Playlist If you have technical problems or cannot find the information that you need in the provided documents, please contact our support team. Our engineering team is committed to providing the required support necessary to ensure that you are successful with the operation of our AHRS sensors.
Contents Tutorial Link................................................................................................................... - 2 Contact............................................................................................................................ - 2 Application...................................................................................................................... - 2 Contents............................................................................................
3 Use Instructions with Android Phone............................................................- 26 3.1 APP Installation........................................................................................... - 26 3.2 Connection.................................................................................................... - 27 3.3 Calibration..................................................................................................... - 29 3.3.1 Acceleration Calibration.....................
1 Introduction The WT901BLECL BLE5.0 is a multi-sensor device detecting acceleration, angular velocity, angle as well as magnetic filed. The robust housing and the small outline makes it perfectly suitable for industrial retrofit applications such as condition monitoring and predictive maintenance. Configuring the device enables the customer to address a broad variety of use cases by interpreting the sensor data by smart algorithms. WT901BLECL BLE5.0’s scientific name is AHRS IMU sensor.
1.1 Warning Statement Putting more than 5 Volt across the sensor wiring of the main power supply can lead to permanent damage to the sensor. VCC cannot connect with GND directly, otherwise it will lead to the burning of the circuit board. For proper instrument grounding: use WITMOTION with its original factory-made cable or accessories. Do not access the I2C interface. Do not change the baud rate because WitMotion Bluetooth sensor’s baud rate is fixed.
2 Use Instructions with PC 2.1 PC Connection PC software is only compatible with Windows system. Link to download software Instructions Video link 2.1.1 Serial Connection Step 1. Connect the sensor with a data cable Step 2. Install the driver- CH340 Download Link Step 3. Confirm the com port in device manager Step 4. Open the software(Minimu.
WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.1.2 BLE 5.0 Adapter Connection Adapter’s CP2102 driver link Step 1. Insert adapter into the USB port in the beginning Step 2. Turn on the switch of the sensor after blue light of adapter flashes Step 3. Wait till the adapter's blue LED light keeps on Step 4. Sensor’s Blue LED light remaining flashing means pairing succeeded Step 5. Open the software, Minimu.exe Step 6. Data will appear once the auto-search finished WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.2 Software Introduction 2.2.1 Main Menu Main Menu of software Button Function File Launch recorded HEX file (Bin format) Tools Hide or display tools box on left side Record Record function 3D 3D DEMO Config Configuration setting Help Language English or Chinese Bluetooth Set Binding device or unbind Firmware update Option for firmware update About Minimu Info about Minimu.
2.2.2 Menu of Configuration Menu of Configuration Button Function Read Config Reading the current configuration Calibrate Time Calibration time of chip Menu of System Button Function Reset Reset to factory setting Sleep Sleep function, not available for Bluetooth sensor series Algorithm 6-axis algorithm or 9-axis Installation Direction Vertical or horizontal installation Instruction Start-up Instructions sending to start-up the sensor WT901BLECL BLE5.0 | manual v0707 | http://wiki.
Menu of Calibrate Button Function Acceleration Accelerometer calibration Magnetic Field Magnetometer calibration Reset Height Reset height data to 0 (only for sensor built-in barometer, including WT901B, WTAHRS2, WTHARS1, HWT901B) Reset Z-axis Angle Reset Z-axis angle to 0 degree, not available for WT901BLECL BLE5.
2.3 Calibration Preparation: Ensuring the sensor is “Online”. Calibration on PC software： It is required to calibrate for the first time usage. 2.3.1 Accelerometer Calibration Purpose: The accelerometer calibration is used to remove the zero bias of the accelerometer. Before calibration, there will be different degrees of bias error. After calibration, the measurement will be accurate. Methods: Step 1. Keep the module horizontally stationary Step 2.
Step 4. Check the result--confirm if there is 1g on Z-axis acceleration WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.3.2 Magnetic Field Calibration Purpose: Magnetic calibration is used to remove the zero bias of the magnetic field sensor. Usually, the magnetic field sensor will have a large zero error when it is manufactured. If it is not calibrated, it will bring a large measurement error, which will affect the accuracy of the measurement of the z-axis angle of the heading angle. Preparation: 1. Sensors should be 20cm away from magnetic and iron and other materials 2.
Step 3. Click OK once the calibration done. Step 4. Place the sensor horizontally stationary and make the Y axis point to the north. Step 5. Check the data of Z axis angle, it’s ok if the value is about 0°. WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.3.3 Gyroscope Automatic Calibration The gyroscope calibration is to calibrate the angular velocity, and the sensor will calibrate automatically. It is recommended that the automatic calibration of gyroscopes can be inactivated only if the module rotates at a constant speed. 2.3.4 Reset Z-axis Angle Note：If you want to avoid magnetic interference, you can change the algorithm to 6-axis，function of resetting Z-axis angle can be used.
2.4 Configuration 2.4.1 Data Recording There is no memory chip in the sensor module, and the data can be recorded and saved on the computer. Method is as follows: Click “Record” and “Start” will save the data as a TXT file. The saved file is in the directory of the upper computer program Data.tsv: the beginning of the file has the value corresponding to the data. WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
It is highly recommended that data can be pasted to a Excel file. In this way, all data will be shown in order. WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.4.2 Data Playback New function: When creating recorded file each time, there will a BIN file created in the folder of record file in path of installed software meanwhile. Recorded data playback method: Step 1: Disconnect the sensor Step 2: Click “File” Button and then click “Load” Step 3: Choose the original path of software installation and load the Bin file WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
Step 4: Click “Run” and the Binary file will be playback When playback, the rate can be editable. WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.4.3 Placement Direction The default installation direction of the module is horizontal. When the module needs to be installed vertically, the vertical installation can be set. Step 1: Rotate the module 90 degrees around the X-axis Step 2: Place the sensor 90 degrees vertically Step 3: Click “Vertical” as install directions on the “Config” menu WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.4.4 Bandwidth Default bandwidth is 20Hz. Explanation: 1. The higher rate of bandwidth setting will lead to higher fluctuation in data waveform. Conversely, the lower rate of bandwidth, data will become more fluent. For example: Bandwidth as 50Hz, Output rate as 5Hz. The waveform is very steady. WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
Bandwidth as 256Hz, Output rate as 50Hz. The waveform will show more fluctuation. 2. The higher rate of bandwidth will solve the data-repeating problem. For example, if the bandwidth setting is 20Hz, retrieval rate as 50Hz, there will be 5 repeating data. If you prefer there is no repeating data, it is required to increase the bandwidth more than 50Hz. WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
2.4.5 6-axis/ 9-axis Algorithm 6-axis algorithm: Z-axis angle is mainly calculated based on angular velocity integral. There will be calculated error on Z-axis angle. 9-axis algorithm: Z-axis angle is mainly calculated and analyzed based on the magnetic field. Z-axis angle will have few drift. The default algorithm of WT901BLECL is 9-axis. If there is magnetic field interference around installed environment, it is recommended to switch to 6-axis algorithm to detect the angle.
3 Use Instructions with Android Phone For APP configuration introduction, please referring to the Chapter 2.2 3.1 APP Installation Install the APK file, give permission of Location and Storage APP download link About Android APP: 1.
3.2 Connection Step 1. Install the APK file, give permission of Location and Storage Step 2. Open APP and choose “BLE 5.0 Series” Step 3: Turn on the sensor and scan the device Note: The device will show as “WT901BLE”+“MAC address” WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
Step 4. When pairing is done, the blue LED light of the sensor will flash and keep about one second After a few seconds, the data will show automatically WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
3.3 Calibration 3.3.1 Acceleration Calibration Step 1. Keep the module horizontally stationary Step 2. Click the “Calibration” menu Step 3. Click the “Acceleration Calibration” and wait for 3 seconds Step 5. Check the result--confirm if there is 1g on Z-axis acceleration WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
3.3.2 Magnetic Field Calibration Step 1. Click the "Calibration" menu Step 2. Click the "Magnetic calibration" button Step 3. Slowly rotate the module 360° around X, Y, Z, 3-axis accordingly Step 4. After rotation, click “Finish” Check the result: The Z-axis angle will have less drift than before. Notice: If there is drift of Z-axis, please stay away from the objective that can create magnetic field interference. WT901BLECL BLE5.0 | manual v0707 | http://wiki.wit-motion.
