External barometric pressure sensor

[Laotse]

Hi Petr,

I do not find solid info beyond the parameters I have posted already. As the format doesn't seem to be open, a mail asking about the standard description to LXNAV might help.

Cheers,
Volker

[Laotse]

Hi Petr,

I've contacted LXNav - let's see if and what they answer...

Cheers,

Volker

[Dutchy]

Does this imply that the Texas Instruments sensortag can be used as baro, temp et cetera sensor ??
Would be nice

[Tonio]

And what about interfacing with Talosavionic sensor?

[kitercuda]

I am now waiting - Talos have sent me their device. So when I get it, I will work on it.

[Sheba]

Hi, has there been any progress with the support of external barometric pressure sensors? I'm currently building one for a friend and I need to know which NMEA sentence (or any other protocol) can I use to get the data into the app. I will use arduino to send the data via bluetooth to the phone, so I can emulate pretty much any serial protocol, I just need the exact structure that would be supported.
Of course, the optimal way would be to use either LK8EX1 or LXWP0 NMEA sentences, as those are supported also by other apps such as LK8000 (for gliding).

[kitercuda]

Hi, use LK8EX1 or LXWP0. Next months I will play with external sources.

[Sheba]

Hi, is there anything new regarding the external inputs? Thanks in advance for your answer.

[kitercuda]

Hi, if your devie is ready, I can connect it to FIF.

[Sheba]

Hi, yeah the bluetooth altimeter is fully functional. Out of the two NMEA sentences I've mentioned, I prefer to use the LK8000 one - LK8EX1. It goes like this:
"$LK8EX1,pressure,altitude,vario,temperature,battery,*checksum\r\n": pressure is
sent as a decimal integer number of pascals, altitude is not sent (99999 is sent instead), vario
is the decimal integer vertical climb rate in cm/s, temperature is in degrees Celsius (1
decimal place), and battery is the battery voltage of the on-board battery (2 decimal places).

I'm personally not sending out the battery voltage, here are two examples of actual sentences from the device:
$LK8EX1,98455,99999,30,29.2,999,*32 (pressure 984,55 hPa, 0,3 m/s climb, 29,2 *C)
$LK8EX1,98460,99999,-51,29.3,999,*1f (pressure 984,60 hPa, -0,51 m/s sink, 29,3 *C)
I've tested it with LK8000 and it works fine. I have tested also the more universal sentence LXWP0, but while that one works fine with XCSoar, I've been having issues with making it work in LK8000 (iirc the vario wasn't working).

Is that info good enough for you to implement it? I'm of course ready to test it right away, or I suppose I could also borrow you the altimeter for you to test it yourself Either in Brno or via mail...