Inside Z-Box

Phil2360Phil2360 Posts: 367 Baller
edited February 2012 in Boat Talk
Can't help myself. Gotta have a look inside things
to see what's there.......
image

Assume the little chippy in the bottom left is the accelerometer.

Comments

  • colo_skiercolo_skier Posts: 780 Solid Baller
    Not sure I know what I am doing. The boat goes I follow. Trying to perfect the deep water start. Squirrel!
  • BoneHeadBoneHead Posts: 6,014
    Interesting. We use the same accelerometer in canbus equipped datalogging equipment in race cars.
    Shane "Crash" Hill

  • Phil2360Phil2360 Posts: 367 Baller
    edited February 2012
    @rico The GPS used is a Garmin GPS 18 5Hz. It communicates over an RS-232 interface, or what is otherwise known a serial port on older computers. (Mice & modems mostly used to use these ports).

    So the GPS port in the master module is just a serial port that can be programmed for any purpose.

    So it's logical now that the GPS talks to the Z-box first & then the Z-box talks to the master module, communicating both GPS & accelerometer data.

    As it contains it's own micro processor, it must also be capable of doing some processing on both sets of raw data before it talks to the master module.

    Here's a Diagram of the GPS's connection to a PC.
    image
  • Phil2360Phil2360 Posts: 367 Baller
    edited February 2012
     
  • colo_skiercolo_skier Posts: 780 Solid Baller
    If i were to hazard a guess I would say that the zbox is "massaging" the raw GPS data being fed to the Stargazer based on Accelerator feedback information and settings in some look up tables based on the a b c settings entered on the multi line guage. Since Stargazer can be used without the zbox the zbox must somehow "trick" Stargazer into calculating position, speed and acceleration form differing the raw data fed to the Stargazer unit.
    Not sure I know what I am doing. The boat goes I follow. Trying to perfect the deep water start. Squirrel!
  • Phil2360Phil2360 Posts: 367 Baller
    @colo_skier there would be no need to "trick" Stargazer, as it now has totally different software loaded, so the stream of serial data coming from the Z-Box will probably contain both positional & accelerometer data.

    If the serial port is running at 19200 Baud, that's 1920 Characters per second, so plenty of data could be communicated in a given second.

    Agree that the raw data would probably be pre-processed in the box as the NMEA data from the Garmin is really not what the system would be interesting.
    Probably communicates either distance traveled, or instantaneous speed for every 5 Hz update.
  • colo_skiercolo_skier Posts: 780 Solid Baller
    @phil2360 Agreed "trick" was probably the wrong term to use. Augment would have been a better term. There must be some computing going on to warrant the micro in the z-box. As that is were the accelerometer is at I was assuming some sort of extra information content being added into the data stream that Stargazer uses. I heard somewhere that the ZO uses 2 ARM 7's which is quite a lot of micopower to analyze NMEA data. Therefore they must be doing a lot more vector and speed math form other data streams. Bottom line is if the system works it's a good thing for us older boat owners.
    Not sure I know what I am doing. The boat goes I follow. Trying to perfect the deep water start. Squirrel!
  • Phil2360Phil2360 Posts: 367 Baller
    Bump for @rodltg2.
    It's roughly 2" square in size.
  • rodltg2rodltg2 Posts: 1,051 Crazy Baller
    2" ! Well I can easily make room for that.
  • Chuck_DickeyChuck_Dickey Posts: 1,459 Crazy Baller
    edited March 2012
    We tried Z-box at our lake this weekend and I'd have to give it a thumbs up. My friend has a 1998 Ski Nautique and we had a 195 lb. fairly strong skier at [email protected] Accurate times and a very similar response as my 2011 PS197 with ZO. Our lake has a short setup as well.

    I think one of the keys may be; the reduction transmission get up very quickly and Stargazer settles more quickly, so no surging was present with Z-box version. Not sure it will be the same on a 1:1 trans.
  • usaski1usaski1 Posts: 730 Crazy Baller
    good to know.. keep those reports coming!
    Mark Turner -- Water skiing changed my life forever.
  • skinutskinut Posts: 405 Baller
    Geeks
    [Deleted User]
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