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Started by Marco C. Last reply by Marco C 7 hours ago. 6 Replies

Hello,I was just wondering, how much current can a 14 AWG wire handle? can anyone explain and give further detais on this matter? MarcoContinue

quadcopter model dynamique identification

Started by telli khaled on Friday. 0 Replies

hello everybody I confused about quad-copter model identification , since the quad is unstable in open loop ,then how can I identify it since is unstable ??? but if I add a controllers in loop of…Continue

GPS Loiter holding issues

Started by Jeff Horton. Last reply by Jeff Horton on Thursday. 7 Replies

Im having trouble with getting the my quadcopter in loiter to keep its position.  It seems like its loosing the signal, but my gcs says the GpsHDOP is at .8 and there are at least 10 sats.  it will…Continue

tarot t4-3d gimbal compability with pixhawk

Started by Nichon. Last reply by Shawn McReynolds on Wednesday. 20 Replies

Anyone managed to get pixhawk to control the t4-3d gimbal?i've tried following the same steps in the wiki but that was for the 2 axis gimbal…Continue

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Comment by Cala on May 29, 2016 at 2:22pm

Yes, but labels were reverse in pixfalcon vs gps, rx with Rx and Tx with Tx, the easier way is if this guys stamped the board as many do, they have lot of space. 

Comment by Craig on May 29, 2016 at 1:55pm

TX and RX are always reversed. TX goes to RX and RX goes to TX. That's how serial devices communicate.

Comment by Cala on May 29, 2016 at 1:18pm

Finally I found the gps in Gervais post, reverse Tx and Rx and works :D in Pixfalcon they are reversed :(

Comment by Cala on May 29, 2016 at 1:07pm

No GPS, the green light work, horrible that any stamped references, any documentation, bad product. :(

Comment by Cala on May 29, 2016 at 7:47am

Thank's Tony, perhaps devs take in consideration your intersting sugestions in gihtub

Comment by Tony Wall on May 29, 2016 at 7:47am this one defaults to 56k baud out the box, and must be set to 9k to get a reliable flash to the new 3.01 firmware for Galileo support and other improvements. So expect to get hold of a CP2102 USB serial adapter and make-up a cable to connect this GPS directly if you want the best out of it. It should still work out the box on the old firmware, but then in APM you must enable GPS auto config and save config when needed, then hopefully it will set the GPS to 38k and you won't get garbled data (by default from HK it's sending 56K but APM wants 38k kind of hard coded from what I gather). That was my impression, after many hours of work with these devices (like 4 different units/quadcopter builds). The debug messages on the console clearly indicate APM has issues with GPS serial speed, disregarding what the physical port is set to (strange).

Comment by Tony Wall on May 29, 2016 at 7:40am

By the way this GPS unit is very good. It will run up to 10Hz in GPS mode and 3Hz in SBAS-DGPS mode. The only issue is that APM is unable to detect this device at speeds higher then 38k baud, so best leave the update RATE at 500ms (2Hz), The problem is with APM not the GPS, if you connect to a PC with u-Center you should get good results. Until the GPS issues are solved in the current APM (and there are, those horrible arm delay horiz/vert GPS errors still) it will force the GPS back down to 38k baud even after you successfully configure higher rates. You can't even disable auto detection in APM because if you do it doesn't bother detecting any GPS at all (doh).

Comment by Tony Wall on May 29, 2016 at 7:36am

You can derive the pin-outs of the GPS from the PixFalcon documentation here:

Page 4 GPS & I2C port.

Comment by Cala on May 28, 2016 at 5:44pm

the only thing that I found that wire is compatible with Pixfalcon and I found Pixfalcon  labels but 5v is in the middle and not the red one

Comment by Cala on May 28, 2016 at 5:41pm

I opened but anything :(


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