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Add support for PX4FLOW (optical flow and rangefinder sensor) #4905
PX4FLOW seems to be the best available optical flow sensor on the market. It has an optical flow sensor and a Maxbotix MB1043 HRLV-MaxSonar-EZ4 directly attached.
It has an easy I2C interface, you can get with single I2C-call optical flow and sonar readings. Implement Optical Flow sensor driver and write rangefinder reading in atomic variable. In the Rangefinder driver read this variable and return. Use QGroundControl software to see optical flow image/video and make camera picture sharp.