Comment

Admin Comment by Thomas J Coyle III on May 5, 2013 at 3:59pm

@Austin,

How do you have your receiver connected to your APM1.4 and how are you powering your APM1.4? Are you using an Oilpan also?

I am using split power rails on my APM1.4. The BEC in the rover ESC powers the APM output rails and a separate BEC powers the APM input rails and the receiver. You might take a look at the ArduRover Wiki http://rover.ardupilot.com/wiki/setup/ Here is the procedure to split the APM1.4 power rails: http://diydrones.com/profiles/blogs/simple-apm-2560-power-hack Also, don't forget to unsolder jumper S1.

It sounds like your receiver is not getting power from the APM as you have indicated.

Regards,

TCIII

Admin Comment by Thomas J Coyle III on May 5, 2013 at 3:52pm

@John,

You might get between 1.5 to 3 ft accuracy depending on the weather, clouds tend to reduce the number of sats received, the surrounding physical environment, and just plain luck.

Regards,

TCIII

Comment by Austin on May 5, 2013 at 2:47pm

Hello, 

I'm using the APM 1.4 and I am having issues with my radio system. I am using a Spektrum dx6i and the transmitter doesn't seem to connect with the receiver. the light on the receiver doesn't flash at all and I suspect it may not be getting power for some reason. The receiver worked with the APM 2.5, connecting nearly every time, but with the 1.4 it just doesn't seem to  connect. Does anyone have any idea why this is?

Comment by John Moore on May 5, 2013 at 12:27pm

I just posted another question in my build thread, this time about MediaTek GPS accuracy.  Trying to figure out what the expected accuracy is an if I am causing my own problem with the way I have it setup.

 

http://www.diydrones.com/forum/topics/john-s-crawler-drone-build-th...

 

John

Admin Comment by Thomas J Coyle III on May 4, 2013 at 9:22am

For those of you who would like to purchase a GoPro camera and don't need the pricey GoPro3, Costco has the GoPro2 outdoor version with the WiFi backpack for $199 USD. It is not shown on their website. I only saw it in the Costco in Davie, FL. Could be its a local special only.

TCIII

Admin Comment by Thomas J Coyle III on April 30, 2013 at 2:59pm

Thanks Mark, much appreciated.

Regards,

TCIII

Comment by Mark Halliwell on April 30, 2013 at 2:22pm

@TCIII

I've been using a Skytraq S1315RAW-EVK from www.skytraq.com along with RTKLIB from www.rtklib.com. I get NRTK corrections from a local service (Australia).

Regards,

Mark

Admin Comment by Thomas J Coyle III on April 30, 2013 at 5:50am

@Mark,

Tridge is working on integrating a L1 control process into the ArduRover2 code, but I do not know when he plans to compelet that effort.

Also we have discussed using the optical flow sensor for accurate position measurement, but that will take using a PX4.

You might want to start a discussion in the Discussion Forum titled "Improving the ArduRover positional accuracy and knowledge" or something like that so you have continuity of the discussion flow.

Could you please point me to a source for the low-cost L1 capable GPS with NRTK corrections.

Regards,

TCIII

Comment by healthyfatboy on April 29, 2013 at 7:31pm

Since he's using a uBlox, he can only go down so far. Since your GPS seems to be able to get 20cm accuracy, you're really the only one that can test whether a 0.1 m would work well as it will be difficult for any of us to test that out.

Comment by Mark Halliwell on April 29, 2013 at 7:21pm

@TCIII

Thanks for the speedy response. While your comments are correct, I've been experimenting lately with a low-cost ($99) L1 capable GPS with NRTK corrections and, for a static position, have been getting down to around 20cm. To put this on to a rover and get similar performance is likely to be a challenge but I'm keen to give it a try.

If you can and to facilitate my further tilting at this particular windmill. can you confirm that, theoretically, the minimum waypoint radius is 0.1m?

On another tack, has anyone used the Optical Flow sensor for odometry? It's use in the Ardu-world seems to be mainly for helis/fixed-wing and hovering/loitering. Given that its a glorified mouse providing x,y co-ordinates and there are examples of ADNS3080 being used for odometry, I'm keen to explore this as an alternative for localization.

BTW, is this an appropriate place for this discussion? I'm new to the group and not sure of protocols.

Mark

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