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5.3.1
Calibration by Instruction
1.Instruct Accelerometer Calibration:
First keep the module horizontal and still, send the instruction: FF AA 01 01 00,
after 1~2s the acceleration X Y Z value will at 0 0 1. X Y angle: 0°. After calibration the value
will be accurate.
2. Accelerometer Calibration L/R:
Keep the module is still at left, send the instruction L: FF AA 01 05 00
After 2s, turn the module to the right side and send the instruction R: FF AA 01 06
00
Calibrate two times the data will be accurate.
3. Instruct Magnetic Calibration:
When calibrating, place the module in a place far away from the disturbing magnetic field
(ie, more than 20 CM away from magnets and iron, etc.). Send the instruction: FF AA 01 07
00
Rotate 360° around the X axis of the module ( you can rotate around the Y axis or the Z axis
first). Rotate a few turns, then turn 360° around the Y axis. Then turn 360° around the Z axis, then
turn a few turns at random, then click the “Finish” to complete the calibration.
Send the instruction: FF AA 01 00 00 to finish the calibration.
Send the instruction: FF AA 00 00 00 to save the Configuration.
5.4 Restore Factory Setting
Method: After connecting the WT901BLECL and APP via Bluetooth, click the
“Resume” .Reconnect the module after recovery.
5.5 Sleep/ Wake up
Enter the sleep mode right two methods. One is to disconnect the Bluetooth connection directly,
and the module will go directly to sleep mode. The other is to send a serial port command, the
instruction content is 5 hexadecimal data: 0xff 0xaa 0x67 0x01 0x00
There are two ways to wake up the module. One is to directly search for and connect to
Bluetooth. The module will wake up automatically and start working. The other is wake-up from
the serial port. Any serial port command can be sent to wake up the module.
6 Communication Protocol
