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Rs-232 to Mavlink issue in a ground station for Pixhawk.

Started by Sam Junior. Last reply by Sam Junior 2 hours ago. 5 Replies

Dear the moment im embarking on a project to build a profesiional Ground station unit for the Pixhawk.the idea is to use a COFDM IP brodge with has both an RJ-45 connection and an RS232…Continue

Is there an easy way to retrieve the timestamp of each .bin log record in a csv or excel file ?

Started by Hugues. Last reply by Alex Wong 14 hours ago. 27 Replies

Afficher le contenu Hi,I posted this on drone-discuss but without any answer, so I try here again:In an objective to georeference images, I'd like to export from a .bin log file the CAM &…Continue

APM problem, motors do not respond as expected

Started by Ricardo Bobadilla Villanueva. Last reply by Bernardo yesterday. 3 Replies

HelloI'm assembling a quadcopter using APM 2.6, I have everything connected properly, I have calibrated the ESC one by one, and setup the APM using the wizard on mission planner, also I tested the…Continue

APM 2.6 Calibration

Started by amirhossein eshtiaghi. Last reply by Will Snodgrass yesterday. 9 Replies

Hi, Why should I calibrate the accelerometer before every use? I believe I am doing something wrong.Continue

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Comment by Thomas Mc Grory on February 8, 2013 at 6:01am


With the new 3DR Hexa Copter and the 2.5 APM Board, is there any instructions specific to this model? The site seems to have very little on the IMG_1186.jpg as far as pictures and diagrams are concerned. The site seems to only have Arducopter and it is very confusing when you purchased a 3DR Hexa Copter.

I think a picture diagram or a utube video from DIY drones would be appropriate on how to build and calibrate the Hexa from start to finish.

Like with any new product you get instructions from start to finish.

Hopefully this will happen soon.

Kind Regards

Thomas Mc Grory

Comment by Reto on February 7, 2013 at 9:54pm

@Xomby: manual of your Rx p. 6 states following. Could it be the cause of your problem?
"Because of the built-in regulator the AR7100/AR7100R has a minimum recommended operational battery voltage of 5.5 volts and is designed to use 6-volt 5-cell NiMH, 7.2-volts 6-cell NiMH or 7.4-volt 2-cell LiPo batteries. (Higher voltage should be used only if the servos are compatible.) While the AR7100 will continue to operate down to 3.5 volts, the AR7100/ AR7100R features a built-in 5.2-volt regulator for the Rudder, Aux 2, Gear 2, Throttle 2 channels output. A 4-cell 4.8-volt battery will not provide sufficient headroom (voltage margin) to maintain a 5.2 regulated voltage. Regulated outputs are provided to allow the gyro, gyro gain and throttle to be operated at the necessary lower voltage while the cyclic servos (aileron, elevator and pitch) are powered directly by the pack voltage (typically 5-cell 6-volt NiMH or if high voltage compatible servos are used 2-cell 7.4-volt LiPo batteries)."

3D Robotics
Comment by Chris Anderson on February 7, 2013 at 4:01pm

Xonby: Use the Power Module with your LiPo. It's the best way to power the board. 

Comment by Xomby on February 7, 2013 at 3:50pm

Hey Chris,

Yes, I see I confused things a bit.   I was just TRYING to do the setup calibration with my Rx battery connected, because it was not working with only USB connected.  I do not plan to have an Rx battery once this thing is flying.   I think I read some post that said possibly the receiver may not have enough consistent power through the Arducopter only.

I'm at the very initial stages of configuration and have not yet connected my LiPo's or anything.   I did get the Power Module with my kit and will be using that.

So, should I try this initial calibration using my LiPo battery?

Hope this helps,


3D Robotics
Comment by Chris Anderson on February 7, 2013 at 1:53pm

Xomby: I'm a little confused by your power setup. What do mean by "Rx battery"? Typically copters don't have that. Also, are you using the APM Power Module? If not the little JP1 jumper that came with APM should be on. 

Comment by Xomby on February 7, 2013 at 1:44pm

Hey Chris and Group,

I am having a similar problem as Thomas Mc Grory.  The only difference is I got the Hexa-B kit, have assembled everything according to the manual.  I am at the "setup" step where I am to calibrate my tx/rx channels.

I have a JR 9303 2.4 radio system and am using a Spektrum 7100 receiver (JR and Spektrum are interchangeable as most know).

When my receiver is connected to the Arducopter, it just doesn't react at all.   I have tried when only connected to the USB power from the computer.   I have also tried with my Rx battery connected directly to my receiver (power from the Arducopter is also connected).    

The receiver light will not come on when connected with EITHER power scenario.

I saw a guy on YouTube that had the same problem, but he says he just changed wires from the 5 way connector wire designed for the Arducopter to Receiver connections.  Oh, I have put tone to the 5 way connector wires mentioned above, everything appears to be solid there.

Any advice?



Comment by Thomas Mc Grory on February 7, 2013 at 8:16am

Hi Chris,

Thanks for your speedy response. I purchased the 3DR ArduCopter Hexa-C Ready-to-Fly. It is all new to us here. Yes we purchased the Spectrum DX7s, it appears to be unbound as it is not showing up like in the attached Connection.bmp.

Need to know how to do this. Has DIY drones done this for me? Maybe I am missing something.




Many Thanks



3D Robotics
Comment by Chris Anderson on February 7, 2013 at 8:04am

Thomas, do you mean you bought it with a Spectrum RC included, and the transmitter and receiver are unbound?

Comment by Thomas Mc Grory on February 7, 2013 at 7:17am


I purchased a 3DR Hexa ready to fly, I can't seem to get the RC binded with the hexacopter, do you know if this has been done for me, is it part of the ready to fly set up by udrones? Anyone any pictures to show me?

Thank You



Comment by Emin Bu on February 2, 2013 at 6:21am

no,hexa with payload of 2,3 or more kg wont stay in air if lose one motor...teorethicly answer is yes,but when u lose motor brain is not capable of reacting so fast...Y6 frame and octa X8 frame could survive one motor loss,octa maybe with two...been there than that with normal one also have trust enough for 9kg,but when u lose motor hexa make salto mortale on the side where is that motor...


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