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Pixhawk 2.1 with Futuba SG14 - Unpredictable Mystery!

Started by Escobar. Last reply by Are Jo Næss on Tuesday. 6 Replies

Okay here is what happened!1. We power up all the devices.2. Switch ON radio Tx3. Arm the Safety Switch.4. Slowly increase the ThrottleAll fine now...Suddenly, the Quad goes full power, blasting all…Continue

Mission Planner Georeference errors

Started by Jack. Last reply by Jack Nov 9. 1 Reply

Can one of the Dev's of Mission Planner please have a look at this error.After the 1.3.50.1 release of Mission Planner, I can't Georeference my photos anymore.I've followed the workflow a couple of…Continue

RTL mode activates automatically at a height of 150 to 200 ft

Started by Pradeep Kumar. Last reply by Pradeep Kumar Sep 16. 8 Replies

Hi,I am using a APM 2.6 FC for my S500 quadcopter. It is also fitted with telemetry to show flight parameters at gcs. I am frequently having a problem of auto initiation of RTL mode at a flight level…Continue

mini APM 3.1 JR DSX9 AR6100e Problem

Started by Jaroslaw Kwiatkowski. Last reply by Jaroslaw Kwiatkowski Aug 29. 4 Replies

Hello,I have big problem with running that I have connected receiver to APM, on MP i can calibrate and all worksBut i don't have any reaction on output, servo don't work thro don't work :-(I'm in…Continue

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Comment by dongfeng on June 5, 2016 at 9:03am

How do you do!

Comment by Cala on May 29, 2016 at 3:41pm

Yes, that the correct position, mine is working now like that. Another thing that don't sound right is a red wire in SCL and a black one in vcc.

Comment by Tony Wall on May 29, 2016 at 3:16pm
Comment by Tony Wall on May 29, 2016 at 3:11pm

The connection cable provided with the GPS is straight, no cross-over of TX/RX (just the whole connector is up/down), but as the motherboard of the GPS (I opened it) is not labelled we don't know that the RX goes to RX as Cala suggests. The only documentation is on the PixFalcon side, so the GPS obviously has TX and RX pins the other way around as Craig says, else it wouldn't work. Both of you are right, no mistake has been made by the Holybro manufacturer besides not documenting the PixFalcon peripherals (shame because the rest of the docs and web site are nice and clean).

On the GPS side we have then, from left to right: 

1 = GND (pin 6 on FC)

2 = TX (RX on FC)

3 = RX (TX on FC)

4 = VCC +5V

5 = SDA

6 = SCL (red, pin 1 on FC)

Sound right?

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 http://www.rcgroups.com/forums/showthread.php?t=2576614 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 https://github.com/ArduPilot/ardupilot_wiki/pulls

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

...so 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).

 
 
 

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