Many of you probably know about this.  Jason explained it's about removing the low pass filter from the ESC firmware.  Pretty fiddly procedure, but looks to be very worth it.  See links under video.

 Most stable, responsive Arducopter vid I'm yet to see...  



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Comment by hemanthtguru on December 9, 2011 at 11:45pm

more info or links to find how to reflash the esc or link the firmware

Comment by Nick Mann on December 10, 2011 at 12:08am

Okay, well if you look at the vid on youtube you'll get these, but here we go....

Comment by DaveyWaveyBunsenBurner on December 10, 2011 at 2:24am
Im interested to know what particular Hex file users get good results with.

If users can report results back heee, ill do the same..

Comment by Max Levine on December 10, 2011 at 4:44am

I used tgy.hex, lust like it says in the guide, (Build from 2011-09-06) , there is another one in that, I guess, is newer.

Remember you CAN NOT flash it back to original firmware !!! and NO PROPS !!!

If someone want to compile fine-tuned .hex for ACM please do :)

Faster ESC update speed, enables higher P value, I got up to P=7 !!! (JDrones frame), after some flying ended-up with P= 5.8 and it flying really nice now :)

No need to change anything in ACM code :)

2.0.55 is very good, so its not all in the ESC firmware ;) Thanks to Jason !!!

I flashed JDrones 20A ESC

One more thing, you may need to lower throttle end-point on your radio:

to 115-120%

Big thanks to simonk, Nek and timecop :)

Comment by DaveyWaveyBunsenBurner on December 10, 2011 at 5:55am


I'm rubbish at programming my TX! When you say lower the endpoint? You mean lower the bottom endpoint because the motors have a tendency to start when the throttle stick is at the bottom?

Thanks for the photos, very useful!

Comment by Max Levine on December 10, 2011 at 6:36am
There is no ESC range calibration in tgy.hex and I think low point set lower than 1000 by default.
Just lower it a bit see if it works
Comment by Matt Gaige on December 11, 2011 at 11:04am

I ordered a set of modded ESC from today that offers the FW.  I hope to try them out next weekend sometime when they arrive.  The reflash was free.  I hope for good results.

Comment by Vincent Mees on December 11, 2011 at 11:49am
Comment by Matt Gaige on December 11, 2011 at 1:39pm

Yes, Ken @ QuadroUFO told me when ordering just email him about your order and request SimonK's FW.  He is in CA, USA.  I was told that also by the group/thread over on RCGroups Forums.  Ken said he only has 30A ESC's but that is OK with me.

Comment by DaveyWaveyBunsenBurner on December 18, 2011 at 2:44pm
I got some time to do this today and the leap in stability is excellent! Perhaps this should become recognised in the wiki as an advanced option.

For anyone using an avrispmkII programmer with AVRDUDE on Windows, the drivers that ship with AVRStudio don't work with DOS applications so I used these on Windows instead and it worked fine. I also had to add the -P usb flag:


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