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ESC Calibration

Started by james lambert. Last reply by Randy 3 hours ago. 4 Replies

Hi AllI have been struggling with this for a few months on and off but I have been at it full on this past week and I have got nowhere!! I go through all the usual steps and after the long monotone…Continue

Tags: Pixhawk, Quadcopter, calibration, ESC

yaw not operating correctly

Started by Damo. Last reply by Randy 4 hours ago. 1 Reply

on my quad, pitch,roll and throttle are working fine. When in stabilize the yaw appears to have the effect of moving along the 5oclock to 11 oclock axis, although i have to land fast before it…Continue

APM 2.6 Gimbal Setup

Started by Samuel Arnold. Last reply by Okan Önal 20 hours ago. 18 Replies

Hi. I have a question on how to install a Servo 2 axis gimbal with my APM 2.6 and am a bit confused about how and if I have to cut power lines from the servos? or get an external UBEC?! or can I bind…Continue

APM 3.1.5 Hex Motor 6 not Starting

Started by Nate Volk. Last reply by Nate Volk yesterday. 3 Replies

So, I'm building a new hex.  Got it all wired up, programmed the esc's, did all the calibration stuff.  Motor 6 won't start on the APM.  Feels like the brake is on.  Connected that motor directly to…Continue

Tags: motor, esc, apm, hexacopter, hex

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Comment by Ken Gaines on May 20, 2014 at 9:07pm

Sean, check out this link for a GREAT DIY hack that will help you on your way.

The tutorial shows how to use APM to do this, but I bet you could use an AUX on the Turnigy with the right PWM to accomplish the same thing. You might even be able to mix two channels on the Turnigy to simultaneously trigger both cameras, but using APM to do it is much easier IMHO.

Comment by Sean Headrick on May 20, 2014 at 8:46pm

I am a bit new to it, but I am triggering a couple cannon cameras with the CHDK USB connected to the with a turnigy Rx switch. All i am looking for is a high PWM signal. It seems like it shouldn't be this hard. I think I just have some servo or PWM limits out of wack.

Comment by Randy on May 20, 2014 at 7:52pm


    I guess you're triggering "cameras" not "cannons"!  In any case, it may be because the update rate on the pins on the back of the APM are running at 490hz while RC10 and 11 only run at 50hz.  It's likely the servo or whatever that is attached to the pins that can't handle the high update rate.

Comment by Artem on May 20, 2014 at 5:44pm

ok, maybe everyone now this and it is an obvious thing but here is what I just figured out:  the "noisiness" of your 5v source to the FC will affect the number of sats your GPS will find!  In about February I upgraded my copter to 6s and because 3dr doesn't carry a 6s PM I got myself an eBay version which supports up to 30v and provides V, I and 5.2v for up to 3amps. Since it was only 15usd I honestly didn't hope it would work right away, but surprisingly it worked right out of the box!  Voltage and Amps readings on APM were extensively bench tested with a borrowed watt meter and my multimeter to confirm their worthiness. Everything checked out good, in fact I was very happy, I didn't even need to adjust anything in MP, I just chose 3dr power module and I had m volts amps correctly comprehended by APM.  around that time I had minor crash in which I though I damaged my 3dr GPS/MAG combo, so the sats were never higher than 11 and that happened only after 5-6 minutes sitting in the open field. since it was flyable and I consistently was getting 11 sats + 1.6-1.8 hdop, I didn't bother to replace it. So here is the culmination:  Last weekend I got a new 3dr gps/mag from a friend of mine and put it on the copter, again 11 sats and no more! I started experimenting with the shielding, but doesn't matter what I tried I still had 11 Sats, that's it.  Finally I switched my attention to my friend's copter to see what was different... the first thing that standed out was that he runs 4s, I took his battery plugged in to my copter.... still 11 sats! ok, the only thing different among our builds left was PM. I took my old 3dr pm, soldered it onto the available leads of my PD board and hooked up a 4s batt, right away I got 13 sats and that number went to 14 in about 2 mins.  that is w/o ANY shielding of GPS... I went back to my 6s ebay PM, took the gnd/vcc wires and put them through an FPV LC-filter. hooray 14sats in under a minute from cold start (due to lack of time the operations took place on different days). now I have at least 9 sats inside the garage with garage door closed, no windows and a second story on-top. 

just my .02

Comment by Sean Headrick on May 20, 2014 at 5:14pm

Some help please! I have been trying to get two cannons to fire simultaneously while being stabilized by two servo driven gimbals running off pins RC10 and RC11. 

When using 10 or 11 to trigger the cameras works those seem to be the only pins that drive the servos. I have tried multiple times to get RC8,7, just about everything I can

 think of but I seem to be missing something. I am using channel

 7 as my manual camera trigger and have set the servo out function of RC8 to "camera trigger" I am really at a loss. If anyone could point me in the right direction I would sure appreciate it.  

Comment by Andre Schoonbee on April 22, 2014 at 1:37pm

I have another basic question:

What is the significant difference between professional autopilot systems and opensource units. IS it really worth the extra money or will opensource units be able to provide the same functionality such as blackbox, phone or tablet comms or even joystick from ground station control?

Comment by Shyam Balasubramanian on April 22, 2014 at 1:10pm

@Andre Schoonbee : I think this is a great idea :)

I am sure, such a mode like "Point of No return" will give more versatility to Arducopter code base and probably, save some folks their copters!

Comment by Andre Schoonbee on April 22, 2014 at 1:00pm

I have an idea/request

I believe it will be of great help if we could have a mode like "Point of No Return". The idea is that the autopilot needs to monitor the battery usage as well as the distance from home and work out the consumption of power. Then given the amount of battery power still left it should initiate return to home. This will prevent loss of the unit. TI have this as a mode will give the user the ability to select this if they are flying over difficult terrain or over water.

Comment by Artem on April 20, 2014 at 7:12pm

Hi, I am trying to pair 2 air modules of an old 3dr radios, does anyone know how to accomplish this?  

Comment by Thomas J Coyle III on April 19, 2014 at 4:11pm


The PM Eagle files are on this webpage:PM


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