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Resolved issues with my T3-mini

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  • Michael Wright
    I had problems with my Tracker3-mini when I wired it into a box. It could not power both a GPS on port A and a PulseOx sensor on port B. I mentioned about this
    Message 1 of 5 , Jan 26, 2014
      I had problems with my Tracker3-mini when I wired it into a box. It could not power both a GPS on port A and a PulseOx sensor on port B. I mentioned about this in earlier posts, also exchanged messages with Scott Miller about current draw.

      I got it working by using a separate 5V regulator to power the GPS and PulseOx sensor. I also replaced the 680 ohm resistors for external LEDs with 1K resistors to reduce current draw from T3-mini board. With these changes made, it works as expected. However, I've not tested using just a 9V battery. Hazard is to not have 9V battery installed when connecting to 12VDC.

      I uploaded to Files section a connection diagram and photos of the box. My intent is to have all connections and power switch on top, not enough room for analog input connector but I don't expect to use it much (in fact, I've not used it yet).
      K6MFW_Tracker3box.jpg
      K6MFW_Tracker3boxdiagram.jpg
      K6MFW_Tracker3insidebox.jpg

      PulseOx sensor is a Nonin 3212 oximeter that outputs pulse and blood saturation O2 levels, Scott worked with Michael NE6RD on this for ParachuteMobile.org. There is firmware that takes this 9600 baud and packages it along with GPS data into a packet stream. It's interesting as I've done APRS while driving in SF bay area traffic (my pulse varies from 70s to 90s depending on traffic). though this day appears I was calmer than usual (some data from 1-23-14 below).

      Another I put pinouts of connectors on the box itself so if a cable needs to be made, I don't have to chase down documentation.

      Michael K6MFW

      data from K6MFW-9>APOT30,WIDE2-2,qAR,W6YX-5:!

      3722.39N/12204.05W>338/045/A=000148HR 73 SpO2 98 scanning 145.23
      3724.61N/12203.76W>027/018/A=000012HR 68 SpO2 99 scanning 145.23
      3725.06N/12203.52W>283/000/A=000036HR 75 SpO2 97 scanning 145.23
      3724.82N/12203.72W>183/011/A=000077HR 75 SpO2 98 scanning 145.23
      3724.45N/12203.98W>200/031/A=000061HR 73 SpO2 98 scanning 145.23
      3723.37N/12204.13W>184/007/A=000122HR 72 SpO2 98 scanning 145.23
      3723.17N/12204.12W>174/011/A=000127HR 75 SpO2 99 scanning 145.23
      3722.65N/12204.06W>180/013/A=000136HR 76 SpO2 99 scanning 145.23
      3722.09N/12203.88W>153/012/A=000178HR 80 SpO2 97 scanning 145.23
      3721.56N/12203.78W>178/020/A=000187HR 80 SpO2 98 scanning 145.23
      3720.88N/12203.59W>180/020/A=000232HR 79 SpO2 98 scanning 145.23
    • spanky4035
      Hi Michael, I was looking for your pictures, but could not seem to locate where they were posted. I recently bought a mini, and have several ideas on how to
      Message 2 of 5 , Jan 27, 2014

        Hi Michael,

        I was looking for your pictures, but could not seem to locate where they were posted. I recently bought a mini, and have several ideas on how to "package" it.

        Thanks, Paul.

      • Michael Wright
        ... if you go to the website for this yahoogroup, there is a section called Files (along with other sections i.e. Photos, Links, etc.) they are there. Look
        Message 3 of 5 , Jan 27, 2014
          > I was looking for your pictures, but could not seem to locate where they were posted. I >recently bought a mini, and have several ideas on how to "package" it.

          if you go to the website for this yahoogroup, there is a section called "Files" (along with other sections i.e. Photos, Links, etc.) they are there. Look for my callsign K6MFW and T3mini in filename, and recent date.

          Michael K6MFW
        • mikeht220
          Additional on my T3-mini configured into a box, I tested using 9V battery and it works as well as 12VDC source (obviously the battery will not have capacity
          Message 4 of 5 , Jan 29, 2014
            Additional on my T3-mini configured into a box, I tested using 9V battery and it works as well as 12VDC source (obviously the battery will not have capacity but it is small size). To say again, I installed a separate 5V regulator to power the GPS and PulseOx sensor. I also replaced the 680 ohm resistors for external LEDs with 1K resistors to reduce current draw from T3-mini board.

            Current measurements of 12VDC: When unit first powers up it draws 120 mA then later settles to 95 mA. Before I installed a 7805 regulator it drew 80 mA but T3 never became active.

            I also assembled another T3-mini in a smaller box, too small for analog inputs connector. It functions just like the previous box.

            Mike K6MFW
          • mikeht220
            ... new news. I created album in Photos, K6MFW, and put those photos there. I removed them from Files section.
            Message 5 of 5 , Jan 29, 2014

              > I was looking for your pictures, but could not seem to locate where they were posted.


              new news. I created album in Photos, K6MFW, and put those photos there. I removed them from Files section.

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