Dear all, Thank you for all of your explanations. So I think T2-301 should be enough for me, right? I think the link James gave to me is also confirm what I need.
I'll plan to try it once I have the time to do the research. Thank you very much, guys! Regards, Firdaus On Wed, Dec 23, 2009 at 11:45 PM, James Ewen <[email protected]> wrote: > > > On Wed, Dec 23, 2009 at 1:28 AM, firdaus adinugroho > > <[email protected] <f.adinugroho%40gmail.com>> wrote: > > > I have two sensors need to be installed beside the GPS. The output > > of the sensor is an analog one with voltage 0-5V. I expected to get > > GPS data and also those sensors data. > > Okay, you're in luck! 0-5V is exactly what you'll want! > > > > Based on the information that the T2-301 has two Serial Port, can > > I connecting the GPS trough Serial Port 1, and converting the > > sensors to RS-232 output, then connect them to Serial Port 2 ? > > That's a lot of work that doesn't need to happen. > > The OT2 line has the ability to send telemetry data, which should > allow you to do what you want. If you provide your sensor voltage to > the appropriate pins on the tracker2, you can have the unit send the > sensor data at specified time intervals. > > As Keith already pointed out, > http://wiki.argentdata.com/index.php/Telemetry has a fairly good run > down on the telemetry capabilities of the OT2. (I wonder who wrote > that page???) > > The OT2 has one spare telemetry input available that can accept 0-5V > input. You can hang one of your sensors off that input without much > fuss. Adding the second sensor means that you either lose one of the > default sensors, or you'll need to rewrite the code used by the OT2. > The easier option is to pull something, like the voltage divider, and > inject your sensor data where the voltage divider input used to be. > > If you configure the tracker to send your telemetry data, you will get > a packet sent that looks something like this: > > 2009-12-23 09:27:06 MST: > > EDSON>APOT21,EVNBRG*,WIDE2-1,qAR,VA6KRM-10:T#216,139,179,250,000,000,00000010 > > The data from the onboard sensors are encoded in the values 139 and 179. > > If you want to use that information in an external application, then > you will need a program that will pull the value out of the packet > which you will need to pull from the APRS data stream. If you just > want to be able to manually monitor the values, then making use of > something like the aprs.fi server is great. > > http://aprs.fi/telemetry/EDSON?range=month > > At this site, I am only watching the battery voltage, and the internal > shack temperature. The other telemetry values are null. > > Hope that helps. > > James > VE6SRV > >
