Devo 7e + A7105PA + Range mod current draw.

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24 Jun 2014 22:35 #24229 by PhracturedBlue
Replied by PhracturedBlue on topic Devo 7e + A7105PA + Range mod current draw.
Arakon, the module you use should draw no more than 20mA. It should not have any impact on battery life.
I use Eneloop NiMH in in my Devo7e, and they last > 5 hours generally. I don't really pay attention.

Also, as I've said repeatedly, given an LDO design like the Devo radios have, higher voltage will not give you significantly more longevity for the same maH rated battery, and I do not generally recommend using LiPo batteries in Devo radios even though lots of people have success with them.

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27 Jun 2014 08:38 #24264 by Fernandez
Replied by Fernandez on topic Devo 7e + A7105PA + Range mod current draw.
For the A7105 module now connected RxEn to Gnd and TxEn to 3v3.
How to hook up the GIO1 and GIO2 pins?


I am waiting for my 3v3 regulator, when I receive it will post results, it should stop of humming and more power, due to 0.5V. The regulator in devo 7e is a really small one, so can't dissipate when at higher power Tx.

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27 Jun 2014 10:26 #24265 by aMax
With that wiring let them float.

But where did you find that 3.3V regulator on the pcb? Looking at my pictures
of conversion, I only can see a 78D05L.

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02

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27 Jun 2014 11:16 #24266 by Fernandez
Replied by Fernandez on topic Devo 7e + A7105PA + Range mod current draw.
see image of Devo 7e, looking at the small size I would say max 100mA.

would not be surprised as flying with clipping regulator, humming devo 7e also cause some unreliability could lead to crash?
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27 Jun 2014 11:20 #24267 by goebish
Replied by goebish on topic Devo 7e + A7105PA + Range mod current draw.
Anyone knows if it's a switching or linear regulator ?

If it's linear just stack a similar one over the existing one :P

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27 Jun 2014 11:57 #24268 by Fernandez
Replied by Fernandez on topic Devo 7e + A7105PA + Range mod current draw.
Never put regulator parallel, as they will not distribute the load equally. (could work but then must put a Resistor at input sides of each regulator)

replace by a 500ma capable pin compatible replacement? any sugestions?


I ordered a 1117 seperate regulator module.

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27 Jun 2014 12:19 #24269 by aMax
Yes, the L04A is damn small...
if similar to lp2981, it delivers 250mA and 300 mA peak.

Did you trace pin 3 ( on/off)? To what is this bound?
I did messure 12 μA comsumtion, even the TX is off... :oops:

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02

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27 Jun 2014 14:02 #24272 by Fernandez
Replied by Fernandez on topic Devo 7e + A7105PA + Range mod current draw.
It seem 2 outer pin on top are battery input, left bottom bypass C, right bottom 3v3 out.



I think I just remove the reg, then apply 3v3 just at the Vdd pad near the module. Vin can be taken from the pad just above the cap near the ruglator, gnd can be attached to shield of Tx module.

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27 Jun 2014 18:26 - 27 Jun 2014 18:34 #24275 by aMax
Then they switch the device via source voltage on.

1. V_IN
2. Ground
3. ON/OFF
4. NC
5. V_OUT

Pincount like normal IC.

The next days I will open the TX to inspect this.

Did you measure the current drain with the new wiring?

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02
Last edit: 27 Jun 2014 18:34 by aMax.

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30 Jun 2014 16:41 #24312 by dehalo
Replied by dehalo on topic Devo 7e + A7105PA + Range mod current draw.
I doubt that the regulator causes the buzzing sound.
The sound differs clearly from protocol to protocol (e.g. Devo vs. DSM2).
Must be some RF phenomenon.

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30 Jun 2014 16:49 #24313 by vlad_vy
Replied by vlad_vy on topic Devo 7e + A7105PA + Range mod current draw.
Seems that 'sound.c' code modification can eleminate buzzing from the speaker for Devo7e.

bitbucket.org/PhracturedBlue/deviation/i...ays-with-high-signal

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01 Jul 2014 19:55 #24338 by D_an_W
Replied by D_an_W on topic Devo 7e + A7105PA + Range mod current draw.

aMax wrote: With Deviation 4.01 or earlier, it is advised to bind TXEN to VCC and RXEN to GND.
Works well, but when you use DEVO protocol, it seem that the board will not be put completely to sleep ...( or standby, really don`t known)

With the Nightly, it is said to connect TXEN to GIO1 and RXEN to GIO2.
I think, that due to better protocol handling this will save a little
battery power too.


Am I right to assume then it is nightly builds and any final version produced after (4.02 for example) that this newer wiring layout is recommended for?

*** Walkera Devo 10 * 4-in-1 Module * Deviation v5 *** *** Walkera Devo 7E * A7105 Module * 2x 3 Way Switches * Power Mod * Deviation v5 ***

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03 Jul 2014 16:24 #24359 by aMax
I changed my wiring today from old to new.... :-)
With any Nightly it is highly recommended to use the new wiring.
Even with my old devo7e-v4.0.1-ac4f0b2 firmware, I save round about 100 mA when running into DEVO mode.

I am happy with that result.

Whole TX...........with A7105-D03 on board.
DEVO old:                   DEVO new:
  1mW  = 212mA             = 111.8mA
  3mW  = 216mA             = 113.4mA
 10mW  = 224mA             = 117.6mA
100mW  = 256mW             = 148.2mA
150mW  = 260mA             = 157.2mA

LCD set fix on 2....

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02

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03 Jul 2014 20:04 #24365 by Fernandez
Replied by Fernandez on topic Devo 7e + A7105PA + Range mod current draw.
I expected that current consumprtion, was less as humming after wiring GPIO pins was much less.

Did you measure RF output power or did do range tests, any differences?

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03 Jul 2014 21:04 - 03 Jul 2014 21:30 #24370 by aMax
All working as it was before. Only backyard testing...

Super CP = 1mW no issues flying within 15 meters.
Test: 300 microW <23 meter,100 microW =15 meters (holding antenna sideways)

V911 pro = 3 mW, chassing pigeons high over the top of the roof... :lol:
Test: 100 microW < 23 meters (end of my garden) Binding from off to on!
Antenna sideways or pointing to the heli.

The powerrange of the A7105, with that little wire, seem to be better than the
CYRF6936 with the Devo7e antenna. :oops:

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02
Last edit: 03 Jul 2014 21:30 by aMax. Reason: changed > to

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03 Jul 2014 22:18 - 03 Jul 2014 22:22 #24372 by Fernandez
Replied by Fernandez on topic Devo 7e + A7105PA + Range mod current draw.
I have replaced the small hot 3v3 regulator, unsoldered / removed it from the devo 7e board.
Put AMS1117 module connected output just for ease direct to 3v3 point close to module. It gives now a stable 3V3 at any powersetting.


With regards to hum, it is still very softly present, I must put my ear on it.
There is a transistor with 10k at the base, driving the speaker, so it must be noise on the input. I tried a 10nF on the base but did not help. I tried a 10uF on the psu, does not help.

Anyway I'll leave it like this.
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Last edit: 03 Jul 2014 22:22 by Fernandez.

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08 Jul 2014 20:58 #24473 by Arakon
Replied by Arakon on topic Devo 7e + A7105PA + Range mod current draw.
With the latest nightly, my battery drain seems to have dropped significantly.. I forgot to turn it off earlier and after 30 mins the battery had dropped only 0.02v or so.

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29 Aug 2016 14:25 #53240 by Khan
Hey guys,
Sorry to dig up that topic, but i think it's relevant to my problem :
I power my 7e with a 6.6v LiFePo 2s 700mAh battery. It's got the range mod and a A7105 module from a V911 tx, and also the 2x3 switch mod
I found that my batteries didn't last very long, so i checked the current draw of my Tx.
Here are the details :
Power 	CYRF	A7105	No module (PPM or USBHID)
100µW	0,20 A	0,18 A	0,18 A
1mW	0,20 A	0,18 A	0,18 A
10mW	0,20 A	0,19 A	0,18 A
30mW	0,21 A	0,20 A	0,18 A
100mW	0,21 A	0,21 A	0,18 A
150mW	0,22 A	0,21 A	0,18 A
I'm a little concerned that there's always a minimum 0,18 A draw...
I tried with the A7105 module unpowered (desoldered the VDD line) but the results were unchanged...
I'm running nightly v4.0.1-6dd95db (I haven't updated it yet to v5.0 as I understood there were problems with DSM2/DSMX, which are the protocols I use the most)
Oh, and I do hear the hum, which doesn't stop after I push a trim button.

Anyone got an advice on that ? Is there a way I can get the current draw back in the 100mA range as I saw earlier in this post ?

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29 Aug 2016 17:03 #53242 by aMax
Your wiring seems not to be right for the Nightly. The modules not in use are not in powersave mode..
Thats why the tx nearly uses 200mA....and more.
Additional to that your range mod on the CYRF is not working. There should be at least a difference of 43-46mA from 1 to 100mW .

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02

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