[aprssig] FindU Telemetry page - Help needed
Mark Cheavens mcheavens at usa.netFri Oct 10 19:25:30 UTC 2008
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I am trying to work with the telemetry page on FindU. I have a telemetry value that requires the attached math to make it display the way I want. I haven't figured out how to make the math work to get it to display correctly. Any help would be appreciated. Sample URL: http://www1.findu.com/cgi-bin/tele1.cgi?call=PURG&last=96¶m=1&b=1.0&label=Purg_Repeater_Cabinet_Temp&units=Temperature&autorange=1 I am reading telemetry parameter 1. I need to take the value (Currently sitting on my bench in an air conditioned room!) with a value of 148 I would LIKE to have the value in Degrees F (I know that C would be easier)..... So here is the formula: ((Telemetry + Correction Factor) X 1.9608 Sensor Multiplier - 273.15) * 5 / 9 - 32 = F For this install the correction factor is 4.7. 1.9608 is the sensor multiplier (Constant) The rest if just the basic math... OR ((148-4.7)*1.9608-273.15)*9/5+32=TempF I don't understand how the a= b= and c= can get me there! http://www.findu.com/cgi.html#tele1 Any help would be appreciated! (I have figured out the easy linear ones in the past - Like this same one for voltage - http://www1.findu.com/cgi-bin/tele1.cgi?call=PURG&last=96¶m=2&b=.072254&label=Purg_Batt_Voltage&units=volts&autorange=1 (FYI - This is the output of an OpenTracker+ being used in an outdoor solar only radio site (Emergency Clinic) to record interior temperature for the batteries and battery voltage. - I do have it on the status line, but I don't like the resolution, and would like to plot it like I have done for the voltage) http://map.findu.com/purg Mark KC5EVE
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