Replies to This Discussion

3D RoboticsPermalink Reply by Chris Anderson on October 19, 2010 at 1:58pm

We're working on an updated Remzibi OSD implementation, so would be interested in what you come up with. Off the top of my head, I can't see why you wouldn't just use Port 2 for that and create a custom GCS library for OSD output.

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Permalink Reply by Mark Randall on October 19, 2010 at 3:42pm

Alright. So on the oilpan, I'm guessing those little pins labeled RX2/TX2 are what I want. I could use +5/GND from the pins next to the reset button (messy, but workable).

Of course, the idea of an updated Rembizi is taunting me. I haven't bought one yet because I wanted to make sure it's possible. Please tell me the new one won't hit production till next year. It'll make my decision nice and simple. :)

Thanks, Chris.

Mark

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DeveloperPermalink Reply by Doug Weibel on October 19, 2010 at 8:48pm

Whoa! Hold it!

The pins for port 2 are used for the I2C connection to the ADC on the shield. You cannot use them for serial communication.

If you want to use an xbee then you are "out" of serial ports, unless you want to work out how to share one.

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3D RoboticsPermalink Reply by Chris Anderson on October 19, 2010 at 10:49pm

Whoops--Doug's right. I forgot that I2C took that. There's probably a way to share the USB one, which isn't used in flight, but I'd have to dig into the board file to figure out how.

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DeveloperPermalink Reply by Michael Smith on October 22, 2010 at 8:11pm

It's SPI, actually. The oilpan's use of port resources from APM is pretty obscene.

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3D RoboticsPermalink Reply by Chris Anderson on October 25, 2010 at 9:13am

Yes, my mistake. The last serial port is taken by the dataflash. So the four ports go to: USB, GPS, Xbee and datalogging. But you could share the GPS port for an OSD: in flight, only the Rx line is used by the GPS, so the Tx line could be used to send data to an OSD.

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DeveloperPermalink Reply by Michael Smith on October 25, 2010 at 11:09am

Several GPS devices require commands be sent to the GPS in order to achieve correct initialisation.

You'd want to be sure that the Remzibi unit wasn't confused by these commands, and that the OSD baudrate matched.

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Permalink Reply by Blake Krone on October 25, 2010 at 1:27pm

Great thing about Remzibi is that it doesn't care what baud rate, it auto-detects on each power up.

I'll try the GPS port and see if I get less interference. I'm thinking of adding a "delay" to start the output to Remzibi of a second or two so that the it doesn't get confused with the GPS setup commands changing the GPS baud.

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Permalink Reply by Mark Randall on October 25, 2010 at 4:24pm

Please forgive me if this is naive, but is there a way that the xbee could potentially share the USB port, at least in flight mode? It doesn't seem like there's much output to USB during flight, so maybe the telemetry could be written out there, leaving port 3 available for OSD.

Mark

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DeveloperPermalink Reply by Michael Smith on October 25, 2010 at 4:36pm

The oilpan's use of port resources from APM is pretty obscene.

No. The console port is hardwired exclusively to the FTDI chip.

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Permalink Reply by Mark Randall on October 25, 2010 at 5:01pm

Hmmm, that makes sense. I wonder if I could use the sparkfun usb explorer instead of the adafruit board in the air. I thought I read about someone trying that.

Mark

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Permalink Reply by Blake Krone on October 21, 2010 at 6:52pm

So I have almost all of the Remzibi stuff updated for the APM. I've got it so that I can turn on/off the overlay, set home, etc. I built it under the assumption that it would work similar to a GPS library, using generic function calls etc.

I just now was working on the whole Serial2 which you can't use obviously. I'm working out the sharing telemetry port stuff now.

For reference I'm using Ardu1.7 from Remzibi.

Chris, can you shoot me a message on how you guys were thinking of integrating it? No sense on doubling-up the work effort if how I'm going about it is acceptable.

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