Replies to This Discussion

Permalink Reply by Jake Stew on July 7, 2012 at 2:00pm

You don't want to be using oddball signals.  It's a bad idea.  

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DeveloperPermalink Reply by R_Lefebvre on July 7, 2012 at 2:29pm

Very interesting topic as I wanted to get this working as well.

Problem is I believe we don't have enough processing power left on the APM to run NewSoftSerial.

I have heard however, that it can simply be inverted using hardware?  Simply use a transistor?  But I stopped there as I have too many project on the go and this started getting too complicated.

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Permalink Reply by Christian Winkler on July 7, 2012 at 10:46pm

@Jake: what do you mean by oddball signals? Never heard of that phrase, but i am not a native speaker though...

@R_Levebre: Jupp, using an transistor inverter, thats another option. I just thought it might be possible to enhance FastSerial, that it can handle inverted signals. I agree using NewSoftSerial is not an option.

Will keep you posted.

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Permalink Reply by Chris Huitema on July 8, 2012 at 3:10am

Im going to try this with my mini.. slightly different setup tho. I have been planning using the mini as an i2c interface port to the AMP1 for the sonar digital port. ie. sonar ->digital out -> Mini -> i2c -> APM.

would be nice to have just the GPS data going to the RX - as its not fast enough for the whole kit and kaboodle in the mavlink data on the uart port.

I wonder what the best way to get the data would be? listening to the GPS when it sends data to the APM would be the least intrusive and wouldnt involve any changes on the apm side. but is that possible with i2c? or would it tie up the mini too much waiting for data like that?

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DeveloperPermalink Reply by R_Lefebvre on July 8, 2012 at 3:20am

Chris, my one and only goal with this concept is to transmit data to the FrSky Tx using the FrSky Telemetry Hub protocol.  That way I can simply plug in the FrSky Telemetry Display on my radio and see the data on my Tx, just as if I had a Telemetry Hub installed on the plane.  I just want something simple that allows me to see speed, G-Froce, etc, while flying.  I don't want anything more complicated than that as I already have an Xbee/3DRadio, etc.

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Permalink Reply by Christian Winkler on July 8, 2012 at 3:39am

Ok, now i ran into a problem it thought would not happen....

The CPPM Mode of neither D4R-II nor D8R-SP works with the Arducopter 2.6 Firmware on APM2....ARGH

Tried both variants:

1) Bridged signal input pins 2 + 3 and connected sum signal to chanel 1 input: Result NOTHING

2) soldered the liddle bridge ppm->-->Ch5 and connected sum signal to Channel 5 Input on APM2: Result NOTHING.

Any Ideas on that?

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Permalink Reply by Renato Aranghelovici on July 16, 2012 at 1:33pm

I am currently using D4R-II with Flyduino / MPNG without issues.

You must bridge 3+4, not 2+3. PPM will be output on CH1

For D8RSP you already have CPPM on ch8 by design without any bridge.

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Permalink Reply by Christian Winkler on July 16, 2012 at 9:29pm

Of course i bridged 3+4 on the reciever to get PPM OUT. The reciever works, i can confirm that.

What i mentioned above under 1) is bridging the INPUT pins of the APM2.

So the APM2 is not accepting the PPM signal. From the LED it seems to be fine, but i do not get any movement in the mission planner.

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Permalink Reply by Zachary Eldridge on July 16, 2012 at 1:38pm

Un soldered the bride ppm. It doesn't need that to have CPPM to work.

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Permalink Reply by Jason Willis on July 16, 2012 at 2:42pm

I just removed the bridge mine and it's still not doing anything.

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DeveloperPermalink Reply by R_Lefebvre on July 17, 2012 at 5:44am

Hmmm... I'll have to look at this.  I have used PPM input from a D4R, D8R, D8R-II, and D8R-SP.  No problem.  I have a D4R-II, but I don't think I've actually fired it up yet.  I'll let you know what I find.

I'm pretty sure you're just doing something wrong.

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Permalink Reply by Jason Willis on July 16, 2012 at 2:17pm

Did you figure this out? I just soldered the bridge on my APM 2 and I don't seem to be getting anything from my D4R.  

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