Devo10, excessive battery drain with pots

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12 Dec 2013 12:36 - 12 Dec 2013 12:36 #16541 by billmester
Devo10, excessive battery drain with pots was created by billmester
Hi,
is it just me, or have anyone else noticed that using pots (AUX4 or 5) to drive a channel directly (gyro gain, etc.) drains the TX batteries like hell?
I am using 8xAA NiCd's, 2700mAh. This effect is there constantly, anytime I do that, I see this.
I have set my MIX sw to either give fix 90, 70 and AUX5 to the gyro gain port.
(for testing)
If I switch to the pot, it is draining like 1/100th Volt every second :-(
That effectively nullifies a fully charged battery pack in 2 minutes or so.
As soon as I switch back, the draining stops, sometimes it even crawls back a bit :-)

??????

Before releasing v4, could you please check this?
I am using the August nightly (which was the latest version for a looong time ;-).

thanks, bm
Last edit: 12 Dec 2013 12:36 by billmester.

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12 Dec 2013 16:48 #16548 by rbe2012
Replied by rbe2012 on topic Devo10, excessive battery drain with pots
Well, I can test it only with my Devo12, but might be different there.
Did you see this big drain with special values of the dials (most left/right) or does it seem to be independent of the position?

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12 Dec 2013 19:04 #16557 by kreidler
Replied by kreidler on topic Devo10, excessive battery drain with pots
Could you please post the model.ini for this model. Makes it easier to check

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12 Dec 2013 19:20 #16559 by billmester
Replied by billmester on topic Devo10, excessive battery drain with pots
I am travelling now - don`t have the tx with me.
I have posted a few ini`s and they have not changed since then... any of them will do, this is general for me.
I`ll check for pot position... the gyro sense is normally at a high (60-90) position.

thanks, bm

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12 Dec 2013 19:21 #16560 by billmester
Replied by billmester on topic Devo10, excessive battery drain with pots
...meaning I can post the ini`s tomorrow :)

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12 Dec 2013 20:30 #16563 by kreidler
Replied by kreidler on topic Devo10, excessive battery drain with pots
I looked into your old posts and found a ini for the HK Rex (attached ;) ).
From my side no draining when switching to MIX2. Even continuous operation do not drain the batteries. I am using the latest build.

If you have not tested yet I would recommend to change to AUX4 and retest to exclude a damaged pot.
Attachments:

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12 Dec 2013 20:53 #16564 by FDR
Is it still that jamming pot you mentioned on rcmodell, or you've already replaced it?

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12 Dec 2013 21:25 #16566 by rbe2012
Replied by rbe2012 on topic Devo10, excessive battery drain with pots
I've tested with my Devo12 for more than an hour - same voltage drop if AUX2 is used or switched away (about 0.11V/h). So I believe in general it should not matter if an input is used or not.
If the resistance of your pot is too low it could drain a reasonable amount of current. Normally a current reducing resistor is between the pot's middle pin and the input to avoid damage to the port, but I am not sure if Walkera has spent the money for it...

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13 Dec 2013 05:14 #16568 by billmester
Replied by billmester on topic Devo10, excessive battery drain with pots
:-)
I have replaced it the same day I got the unit, to the same type.
Later on I put the original back, as I could refurb it.
Let me check for the resistor...

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