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Mares Puck PC Cable

Discussion in 'Computers, Gauges, Watches and Analyzers' started by Moerby, May 9, 2011.

  1. DukeAMO

    DukeAMO Barracuda

    # of Dives: 50 - 99
    Location: North Carolina, United States
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    Let us know how it goes.
     
  2. wrenchmonkey

    wrenchmonkey Angel Fish

    # of Dives: 0 - 24
    Location: Utah
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    I finally got all the parts I ordered for this. Gotta track down my breadboard to assemble it for testing. Still not sure which terminals are +/- on the puck itself.

    Any help in that area would be appreciated. Gonna be a busy week, but if I can get some help with that aspect, I'll try and get it laid out and tested. Once I confirm that it works, I'll button it all together, and check back to see if anybody needs one made.
     
  3. buton

    buton Barracuda

    # of Dives: 50 - 99
    Location: Fort Worth, Tx
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    When you put the puck on pc link mode it activates the terminals, take a volmeter and measure the voltage and you will find the correct polarity
     
  4. wrenchmonkey

    wrenchmonkey Angel Fish

    # of Dives: 0 - 24
    Location: Utah
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    I was not aware that it would actually output a voltage when activated. Thanks, I'll give that a try.
     
  5. Lionel Seguier

    Lionel Seguier Garibaldi

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    Hello,
    I am very interrested in the electronic circuit schematic of the USB cable between the PC and the mares puck.
    I do not understand exactly how the electronic circuits (like CP2102) are connected.
    Can you send me the picture with the schematic because the link on the first page is dead ?

    Think you and sorry for my poor english
    Lionel
     
  6. pmalbec

    pmalbec Angel Fish

    # of Dives: 50 - 99
    Location: Chile
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    There is a problem with the business model. Well, it is their business, finally.

    If the cable is cheaper, or they release the model, more people will be interested to buy the Mares Puck.
    Maybe they can charge a little more with the computer plus the cable included... A little more

    Paul, from Chile
     
  7. Bryscus

    Bryscus Angel Fish

    # of Dives: 0 - 24
    Location: Jupiter, FL
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    Lionel,

    Sorry for the slow reply, I've been really busy. I still haven't actually tested this circuit, but it should work as depicted. Here is the schematic. I thought I would have to upload the file again, but it appears that it remembers my uploads. If the image is deleted again it will be much easier to post.

    - Bryce
     

    Attached Files:

  8. skolim

    skolim Garibaldi

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    Hi all!


    I recently bought mares Puck (not puck pro) and I'm quite happy with it, but the cost of PC cable is insane (it costs more than I paid for new Puck:wink: ) so i decided to try and build interface based on your schematic (I already had the USB controller). Unfortunately it didn't work (at least not yet).

    This works as expected.

    This also works

    This doesn't work. I checked pin 26 voltage while software is tying to communicate with puck. It doesn't go low, so maybe there is something wrong here?



    Rest didn't work, here is what happens:
    1. USB cable connected: red diode OFF, green ON
    2. Puck connected in PC mode: red diode ON, green OFF
    3. I run mares connection wizzard, when it tries to find Puck red diode goes down (green is off all the time) so i think pin 12 goes high.
    4. Software goes "thinking" for few moments and than displays that device is not connected. However i think that "something" is happening because if I do those steps without puck connected software instantly displays information that device is not connected.


    Has anyone done more research? maybe there are some adjustments that should be made in this schema?
     
  9. seb13

    seb13 Angel Fish

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    1
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    Hi,
    I'm in the same situation and would like to build my own cable.
    How did you manage the connection between you circuit and the computer pins ? I can't find a plug that fits the computer pin...
    Thanks
     
  10. jwhferguson

    jwhferguson Angel Fish

    # of Dives: 0 - 24
    Location: Johannesburg
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    I am about to build this device. Will let you know whether I experience the same problem
    An important issue is the choice of Schmidt NAND chip. Make absolutely shure the chip you use can operate at 3V power supply and if possible even lower. Some newer CMOS Shmidt NAND chips operate with supply voltages down to 2V. This is what you need. Some other CMOS equivalents operate only from 5V supply voltage and higher; in these chips switching at 3V is not guaranteed to give reliable outputs.
    Kind regards,
    wf
     

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