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ThoneFlow-3901U is a UART version PMW3901 optical flow module, make it easier connect to your control board. The data format is also compatible with discontinued product CX-OF, already supported by ArduCopter.
This module replace the lens on original PMW3901, prevent dust from entering into the sensor or looseness in high vibration environment.
It also fully optimize the performance of PMW3901, no huge spikes in data output anymore, also gives better tracking performance on different surfaces.
byte0: header (0xFE)
byte1: number of data bytes (0x04)
byte2: x-motion high byte
byte3: x-motion low byte
byte4: y-motion high byte
byte5: y-motion low byte
byte6: checksum
byte7: surface quality
byte8: footer (0xAA)
Dimension: 14x11x5mm
Weight: 0.6g
Interface: UART
Baud rate: 19200
FPS: 66hz
Power: 3.3~3.6V
Current: 10mA
Part List:
1 x ThoneFlow-3901Usensor
ECCN/HTS
Qt implementation of optical flow monitor for ThoneFlow-3901U:
https://github.com/DimianZhan/3901U-monitor
Ardupilot Driver:
https://github.com/ArduPilot/ardupilot/blob/master/libraries/AP_OpticalFlow/AP_OpticalFlow_CXOF.cpp
Flight test video:
https://twitter.com/bys_1123/status/1128387078327156736
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