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15197Re: [tracker2] OT USB Telemetry

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  • Scott Miller
    Feb 4, 2013
      There's not presently an adjustment, but I should be able to add that in
      the next firmware version. Everything is referenced to an internal band
      gap reference, so it should be independent of the supply voltage (which
      runs lower than 5v because it's got a series diode) and I can simply
      adjust what the expected voltage of the band gap is.


      On 2/4/2013 5:13 AM, Joe Della Barba wrote:
      > My OT-3M has been reporting 0.3 volts low for about a year now.
      > I could change the telemetry by sending a message if I can remember the
      > format, but that won’t help the comment field.
      > So – is there an adjustment for this?
      > Joe Della Barba
      > joe@... <mailto:joe@...>
      > N3HGB-5
      > *From:*tracker2@yahoogroups.com [mailto:tracker2@yahoogroups.com] *On
      > Behalf Of *n9tkf
      > *Sent:* Sunday, February 03, 2013 5:44 PM
      > *To:* tracker2@yahoogroups.com
      > *Subject:* [tracker2] OT USB Telemetry
      > I have an OT USB that I am using for telemetry. It seems that the
      > telemetry inputs on CN-4 are a bit skewed. CN-4 pin 5 is connected
      > directly to my battery. Measured voltage is 13.1 but the telemetry value
      > reported is 164. I expected the telemetry value to be 131. I also
      > noticed my reported battery voltage in the comment field is 16.4V.
      > Firmware version 55871 installed.
      > CN4 pin 1 should be directly connected to the +5 volt supply according
      > to the schematic. The voltage on this pin measures 4.23V. I measured the
      > output on the +5V regulator and it is 4.99V. The 1 wire temperature pin
      > 2 seems to be ok. I have a light sensor and moisture sensors connected
      > to the CN4 header also.
      > I have EXTTEMP on, and voltage and temperature reporting in the comment
      > section. Here is a link to my telemetry page :
      > http://aprs.fi/telemetry/a/N9TKF-4
      > Has anyone encountered this problem and have a solution?
      > John N9TKF
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