To enable the Holybro PMW3901 optical flow sensor in Ardupilot, set FLOW_TYPE to 4 and SERIALx_PROTOCOL to 18. If you are not sure which serial port you are using, here is a list of serial mapping for the Pixhawk 6 family:The micolink is a lightweight protocol customized by MicoAir Tech, prepared for developers who are ready to write their own code to read sensor data. MicoAssitant software can used for configure protocol or other parameter of MTF-01. Step1 : Connect the MTF-01 to PC by using the USB to TTL module. 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. The Cheerson CX-OF optical flow sensor is a lightweight and low cost optical flow sensor which can be used to improve horizontal position control especially in GPS denied environments. It uses a tracking sensor that is similar to what you would find in a computer mouse, but adapted to work between 80 mm and infinity.