Sticks have dead band

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The servos go to thier full extent but the sticks still have more travel. It 
shows on the main screen of the radio. The Bars stops when the servos stop but 
the sticks are not at the end of travel...dead band.

Trim button do not trim servos when a custom curve is used on that channel.

Original issue reported on code.google.com by funforal...@hotmail.com on 28 Jun 2010 at 4:59

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Hope you made a calibration.

Original comment by vlad...@yahoo.com on 28 Jun 2010 at 7:32

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Yes caliibration was done many times. There are several of us with this 
problem. It is not a calibration problem unless calibraion is not working.

Original comment by funforal...@hotmail.com on 28 Jun 2010 at 8:28

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http://www.rcgroups.com/forums/showthread.php?t=1266162

Also trims do not work if a custom curve is used.

Original comment by funforal...@hotmail.com on 28 Jun 2010 at 8:53

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Check in Analog diagnose (ANA 6/7) the second and third column behind A1-A4.
In Column 2 you see the raw values of the analog inputs. Check if they are very 
assymetric. Normally the value in the middle is near 0x200.
Then check the third column. Ideally the value goes from -100 to +100. 
But If the range is very assymetric, then one value reaches the +-100 but the 
other value gets larger than 100.
Trims do not work with curves, see issue 19

Original comment by th...@t-online.de on 28 Jun 2010 at 9:41

• Changed state: Accepted

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A1 01BE
A2 0258
A3 025B
A4 0233
Range:
A1 -99 to 99
A2 99 to -81
A3 -110 to 98
A4  100 to -108

Deadband on:
 -108 side of A4
-110 side of A3
-99 side of A1
None perceptable on A2

Original comment by jalowe1234@gmail.com on 29 Jun 2010 at 1:05

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Your Potis are indeed a little bit assymetric. (A3 and A4).
The current calibration algorithm is the same as of the V14.
It takes the lower value of the Distance between mid and left or right position 
for the sensitivity calibration. 
Your problem would be solved if we took two different values for the left and 
the right side, this is currently not implemented.
Is the dead-band really as such large that you cannot ignore it?
It is only 10% of one halve of the stick movement.

But what is with A2?  Did you really move the Stick to its edges?
During calibration and during testing?
Try once more calibration.

Is it possible, that your Poti at A2 has a contacting failure?
My Poti had such failure, and i fixed it with contact silver liquid and with 
some epoxy glue. (very fiddly? job)

Original comment by th...@t-online.de on 29 Jun 2010 at 7:03

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Redid calibration
A1  01BF
A2  0227
A3  025A
A4  0236

A1 -104 to 101
A2 98 to -96
A3  -112 to 98
A4  -103 to 99

End of stick deadband is important for some mixes, such as low throttle to 
elevator used in precision aerobatics.  As your software gets more refined and 
as you implement some of the enhancements on your issues list, the deadband 
will be even more important.

I will see if I can twist the locating tabs on the pots to improve mechnical 
centering.  I did that on another TX when the original firmware had deadband, 
and no one knew how to recalibrate the sticks.  I will see if that helps and 
report out.

Thanks for your work on this.

Original comment by jalowe1234@gmail.com on 30 Jun 2010 at 3:26

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maybe that twisting the pots has no effect because the real reason of he 
assymetry is not the position of the mid-position, but the nonlinearity of the 
poti resistance.

The behaviour of your A2 is a little bit strange.
It looks like you can reach more extreme poti values when you move the stick to 
the corners (during calibration) than moving the stick to the edge (during 
testing)
Perhaps you use more force during calibration.

Original comment by th...@t-online.de on 30 Jun 2010 at 1:42

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I just updated to your latest firmware, and get similar results.  Even if I use 
a lot of pressure on A2, I still don't get over -96 and 98.

Your latest firmware is VERY much improved!!!  Keep up the good work.  You are 
turning this into a world class radio!

Original comment by jalowe1234@gmail.com on 30 Jun 2010 at 2:22

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improved ad-conversion, dual calibration
-> r119

Original comment by th...@t-online.de on 5 Jul 2010 at 10:43

• Changed state: Fixed