+x

 

Adam Erchegyi - 11/1/2021 11:01:01 AM

+x

 

b3nn0 - 10/7/2021 7:26:38 AM

Wrt. Protocol Choice:
Here my rule of thumb:

IF your Stratux is built and configured to receive UAT, AND your are flying in a country where UAT is available (US, CA, Denmark I think?), THEN use GDL90. ELSE use NMEA.

Reason: GDL90 uses UDP as its network protocol, which is a good thing in theory, but with UDP it can happen that packets are dropped, delayed or even received multiple times. It's just part of the protocol and to be expected. Sadly, SD is rather intolerant when it comes to such errors.

Additionally, NMEA has proper support for the bearingless circles, yes. You can not use both at the same time.

Wrt. Internet connection:
Sadly, the way Android does routing over multiple interfaces is quite bad, IMO it's simply buggy. The only way to get this to work with Android is by using Wifi Direct: https://github.com/b3nn0/stratux/wiki/Wifi-Direct-and-Android-mobile-data-while-connected-to-Stratux

Wrt. Fan:
This depends on what hardware your Stratux contains and how it is connected. No idea how Dross does it. I assume you don't have a fan control module in there, so you can either connect the fan to 3.3v or 5v. I prefer 3v to have it a bit more quiet. Airflow is good enough either way (well, depends on the fan of course, but full-power is certainly not needed). Google "Raspberry Pi Pins" to see how/where to connect.

BTW: Stratux EU has its own discussion platform, where you usually will quickly get high-quality answers. I don't check in here too often: https://github.com/b3nn0/stratux/discussions

Thanks for the hints, the NMEA protocol looks quite stable for me and there is no use of UAT here (Switzerland) so I'll continue using this to see 'proper' bearingless targets. Actually, I figured that I can use both NMEA and GDL90 at the same time: I flew with a ForeFlight guy and he could connect to Stratux's WiFi network and receive the GDL90 packages while I was still happily using NMEA in SkyDemon. Great use-case!

Regarding the fans I'm still experimenting with the voltages & temperatures, let's see how that goes. For the time being my biggest trouble is the placement of the device: sadly the suction cup is not enough to hold both the Stratux and the 20Ah power bank. I don't want to connect to aircraft power (because that is on the hot bus of the DA40NG and could drain the battery if left plugged in during a lunch break), so probably need to put the power bank somewhere else...