Optical Flow 'working' & issues

[fnoop]

@XRobots

According to the documentation the PX4flow is supported with sonar, just not the sonar it comes with. Unless that’s only for some specific previous version of firmware.

Not sure if this is still correct, but I think it is:

Summary of Optical Flow Development in ArduPilot

Yes, Copter 3.4 has everything needed to use optical flow. I would recommend a PX4Flow because it is supported in all platforms. Be aware that the sonar in it isn’t supported in ArduPilot so you need to have a separate supported rangefinder.