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Old Mar 23, 2015, 04:06 AM
Rangarid is offline
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Low Budget DIY Arduino Frsky GPS

Hi,

i made a small project, where you can interface any GPS you like with an arduino. The arduino will create telemetry data to feed your frsky telemetry receivers.

It currently only works with Frsky D-Series RXs, but i'm already working on the SPort implementation to use with X-Series as well.
It works with D-Series and X-Series receivers.

The setup is pretty easy and no additional hardware is needed, as all the magic happens in the arduino. Normally you need to invert the serial logic level for frsky receivers. This is already done in the SoftwareSerial implementation.

You only need 3 wires: 5V, GND, DATA

GPS is connected to hardware serial (FTDI pins) with 5V, GND, RX, TX

The total cost could be as low as 13$:
Arduino Pro Mini (2.68$)
GPS Module 9.13$

You can find the code on github:
https://github.com/SamuelBrucksch/diy-frsky-gps

Current features:
- Lat / Lon
- GPS Alt
- Sats
- Fix Type

The Fix Type is read from GPGGA sentences. Following fix types exist:
0 - no fix
1 - GPS fix
2 - DGPS fix

Fixtype and Satellites are transmitted over Temp2 in the following way:
Sats: 7
Fix Type: 3
Temp2 = Sats * 10 + Fix Type = 7*10 + 3 = 73

In opentx you can easily extract the values like this (e.g. with LUA script):
Sats = Temp2 / 10
Fix = Temp2 % 10
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Last edited by Rangarid; Mar 23, 2015 at 06:27 AM.
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Old Mar 24, 2015, 10:25 PM
mamacher is offline
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I can't wait to give it a try, I've used an Arduino/GPS as a data logger a while ago on my quad. Would this work feeding a Crius AIO Pro 1.1 GPS info, or is it a completely different stream.
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Old Mar 25, 2015, 01:32 AM
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This converts GPS data into frsky telemetry. Criuas AIOP does not need any converter for GPS:
http://fpvcentral.net/2013/03/crius-...ted-for-mw2-2/
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