GPS telemetry mod - not working

[bobarry]

I added the little Arduino board, loaded the .hex file to provide GPS data to my er9x, but it is not displayed.
First I only connected D5 to the TX line on the receiver. The A1, A2, & signal strengths display properly.

Looking at the TX line with a scope shows a changing signal I see activity on the D6 line but don't know what to do with it.

What am I missing?

bo Barry

[Kilrah]

What mod? Don't recall seeing a mod that involves an arduino for gps...

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[bobarry]

Sorry I was so vague with details. I followed the mods like the JD IO board, connected between the 3DR telemetry input and the Dx receiver (TX input, not A1 or A2). Used a $10 Arduino pro mini board instead. Followed all the steps, but the GPS chords & altitude do not display on the Turnigy er9x transmitter. Hope that explains a bit.

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[Kilrah]

Probably better to ask those guys who posted the mods. Never really seen about that here...

Or at least post a link so we can see what it's about and hazard a guess...

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[MikeB]

Just a guess here. The serial input to the receiver is "RS232", at least it is inverted and accepts +/-6V. Are you driving inverted serial data into it?

Mike.

[bobarry]

Sorry again, I'm a retired absent-minded professor/engineer and Ohm's law is about all is in permanent memory.
Here's the link to the mod I did. I thought I found it here originally.
http://diydrones.com/forum/topics/frsky ... t%3A941307

Also there are some informative posts by a Christine in Europe that explains her mods. She's done a lot of interesting stuff. I'll go re-Google and see if I can pick up some hints.

The idea was/is to pick the mavlink data from the APM to 3DR telemetry line and put it on the serial input of the DJT telemetr receiver, using the Arduino board in between.

Hope that clears it up a bit.
Bo

[bobarry]

One more link:
http://diydrones.ning.com/profiles/blog ... board-v1-0

The reason I posted here is that I thought there was some setting I needed in my Turnigy er9x to get it displayed.

Bo

[MikeB]

Can you check and clarify what protocol format the serial data is in?
Is it FrSky hub protocol or something else?
Also, which version (not revision) of er9x have you loaded? (e.g. er9x-frsky.hex).

Mike.

[bobarry]

I'm using version v1.1915 r804, FrSky nt. I THINK the signal into the er9x receiver 'serial' port is TTL, & Mavlink protocol. I looked at it briefly on a scope, & saw 'activity', but need to recheck it's voltage levels.
Others hooked it up with no problems. The 'expert' 's name is Christian, not Christine as I mentioned. I'll try again to contact her.
Thanks for the help, I'm still dumb, but having fun. Bo

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[MikeB]

You need to make sure the protocol is FrSky hub, not mavlink.

Mike.

[bobarry]

I think the JD IO board converts the Mavlink data coming from the APM (goes to the RF telemetry xmtr) and sends I to the DJT/FrSky receiver in FrSky format. I was wrong earlier.

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[MikeB]

"Connect IOBoard pin D5 to your FrSky receiver pin RX and data will start to flow."

Your first post said you connected D6 to TX on the receiver.

Mike.

[bobarry]

Damn, after all my years with RS232, etc, I fell for a typo instead of thinking things out. THANKS A LOT. I recall where I got the wrong poop. Yea, now I can move onto more difficult probs. Bo

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[bobarry]

What mod? Don't recall seeing a mod that involves an arduino for gps...

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Its the JD-IOboard mod that provides LED blinking along with GPS telemetry. The Arduino Mini Pro 5v, Atmega328 is a suitable sub for just the GPS stuff.

I have mine working good, getting the GPS coords, but cannot get the HEADING displayed. Going nuts trying to figure it out.

Bo Harrisburg, NC