Optical Flow discussion thread

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- XYX > Andy April 27, 2016 at 12:38am
  
  int pixhawk's terminal you can run below commands
  
  nsh>px4flow test
  then you can get below information about sonar
  px4flow: ground_distance: 0.63 m
  px4flow: time since last sonar update [us]: 9524010
  px4flow: quality integration average : 255
  px4flow: quality : 0
  px4flow: PASS
  - Andy > XYX April 27, 2016 at 1:04am
    
    thx will try this!
- Developer
  
  Randy > Andy April 26, 2016 at 9:48pm
  
  Hi Andy,
  
  I'm afraid we don't support using the px4flow's sonar (it's mentioned on the wiki although it may not be perfectly clear). Paul Riseborough tells me it's technical possible to use it by soldering a wire from one place to another but I don't have details on that. The sonar that is comes with is also very short range which is part of the reason why none of the devs have put effort into trying to get it working.
  
  PX4FLOW Optical Flow Camera Board — Copter documentation
  - Andy > Randy April 26, 2016 at 9:54pm
    
    Hy Randy
    
    uups I missed that...
    
    So I can't use my PXFlow if I don't add another sonar to the copter:
    
    WIKI: "Because optical flow requires good sonar/range finder data when the optical flow is enabled, an additional pre-arm check is enforced."
    
    Andy
    - Developer
      
      Randy > Andy April 26, 2016 at 10:01pm
      
      Andy,
      
      I hate to say it but yes, I'm afraid so. Maybe we can get Paul Riseborough to tell us the "green wire" fix to make the sonar work as an analog sonar but the results won't be very good because it'll only work up to a few meters.
      - Al B > Randy April 26, 2016 at 11:27pm
        
        Randy,
        
        Is the old firmware (px4flow-klt-06Dec2014) still the correct one to use with the latest APM flight stack (e.g. Copter-3.3 or 3.4-dev) or should we use the newest firmware version from the PX4 repo?
        
        Old one:
        https://github.com/priseborough/px4flow
        
        Newest one:
        https://github.com/PX4/Flow
        
        priseborough/px4flow
        
        Contribute to priseborough/px4flow development by creating an account on GitHub.
        
        Developer
        
        Philip > Al B April 27, 2016 at 2:10am
        
        That is the version I use
        
        Al B > Philip April 27, 2016 at 7:24am
        
        Philip, Did you mean "px4flow-klt-06Dec2014" ?
        
        Developer
        
        Philip > Al B April 27, 2016 at 7:32am
        
        Yes
        
        Developer
        
        Philip > Philip April 27, 2016 at 7:43am
        
        3.3 or 3.4

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Optical Flow discussion thread

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