Devo 12s 3in1 / 4in1 RF module neat installation.

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29 Feb 2016 20:23 #43903 by TomPeer
Replied by TomPeer on topic 3in1 / 4in1 RF module
I am thinking of using pin 89 or 90.
What would happen if i short these two? i think the easiest way to solder to these pads is to solder a wire in the middle of these 2, but that would maen i have to short pin 89 and 90. Is that an option or a nono?

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29 Feb 2016 20:28 - 29 Feb 2016 20:29 #43904 by TomPeer
Replied by TomPeer on topic 3in1 / 4in1 RF module

it looks like these 2 pins are already shorten by the walkera factory in my case.
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Last edit: 29 Feb 2016 20:29 by TomPeer.

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29 Feb 2016 20:28 #43905 by FDR
Replied by FDR on topic 3in1 / 4in1 RF module
I wouldn't do that.
If you put a fair amount of soldering pasta around, they won't be shorted. It is a challenge to keep the wire still there until the solder cools down though...

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29 Feb 2016 20:31 #43906 by TomPeer
Replied by TomPeer on topic 3in1 / 4in1 RF module
ok thanks.
i will try to clean them up or find another pin then.

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29 Feb 2016 20:43 - 29 Feb 2016 20:43 #43907 by Deal57
Replied by Deal57 on topic 3in1 / 4in1 RF module
89 is B3, 90 B4. Either seems like a good choice for the 6s (and 8 ).

Do you have Kapton tape? I used it to mask off the adjacent pins and it worked nicely. When I soldered to my 6s I masked the pin, then put a small drop of solder on my iron and touched it to leave it on the pin. Then positioned the wire and kept it in place with another piece of tape. Touch the wire to melt the solder and all done.

I heard that an alternative to the tape is White-out... but I haven't used it.

I'll probably practice on another (dead) board first...

Deviation Devo7e 3way switch mod, A7105, NRF24L01
Devo6s 2x2 switch mod, trim mod, haptic, multimodule, A7105, NRF24L01, CC2500
Devo12e 4-in-1 with voice mod -- it speaks!!
Last edit: 29 Feb 2016 20:43 by Deal57.

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01 Mar 2016 00:00 #43917 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module
I found 3-in-1 module CC2500 chip has short telemetry range problem,as the same indoor test condition,D4R-II frsky protocol 3mw control range almost reach 3rd floor , but telemetry only 0.5~0.7 floor, I did same test for few times it gets same result, if I used DEVO 8S+CC2500, telemetry range is almost same as control range :(

By the way, how can I get RSSI telemetry data on my 8S ??? :oops:

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01 Mar 2016 04:50 #43922 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module
This picture is provided by TaoBao seller, 3-in-1 module.




and I get some information:
1, 3-in-1 module(not enough MCU pin) can NOT use/enable LNA, it results short telemetry range problem.
Need to change MCU to fix it at next version.

2, 4-in-1 module can use LNA except A7105 chip.
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01 Mar 2016 07:03 - 01 Mar 2016 07:03 #43926 by blackmoon
Replied by blackmoon on topic 3in1 / 4in1 RF module
I'll wait for the next 3-1 then, but as always, how will you know it's the next revision. There is no mention of version on the pcb.

Thx dc59 for keeping us in the loop.
Last edit: 01 Mar 2016 07:03 by blackmoon.

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01 Mar 2016 10:01 #43938 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module

blackmoon wrote: I'll wait for the next 3-1 then, but as always, how will you know it's the next revision. There is no mention of version on the pcb.

Thx dc59 for keeping us in the loop.


Regarding new version, I will let you know if I got answer.

The 4-in-1 module picture also provided by seller.

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01 Mar 2016 10:33 #43940 by Fernandez
Replied by Fernandez on topic 3in1 / 4in1 RF module
On both modules I do not like the RF path, the length of pcb traces containing RF signal should be minimal at such 2.4Ghz frequency, I doubt that his is matched very well.
Small mm or unmatched traces length can allready cause mismatch and losses.

I would first orient all RF outputs, to the switch and PA, with short lines and then place the other components.

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01 Mar 2016 11:26 #43942 by aMax
Replied by aMax on topic 3in1 / 4in1 RF module

FDR wrote: I wouldn't do that.
If you put a fair amount of soldering pasta around, they won't be shorted. It is a challenge to keep the wire still there until the solder cools down though...

It would be more easy using thin solid enamel coated wire for such connections.
Straightened and fixated on the board or glued to the chip, it will be just a tap with the iron.
E.g, the tail motor wire on a SuperCP has just the right pitch.

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

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01 Mar 2016 11:46 - 01 Mar 2016 11:51 #43943 by aMax
Replied by aMax on topic 3in1 / 4in1 RF module

dc59 wrote: I found 3-in-1 module CC2500 chip has short telemetry range problem,as the same indoor test condition,D4R-II frsky protocol 3mw control range almost reach 3rd floor , but telemetry only 0.5~0.7 floor, I did same test for few times it gets same result, if I used DEVO 8S+CC2500, telemetry range is almost same as control range :(

By the way, how can I get RSSI telemetry data on my 8S ??? :oops:

Telemetry is not depending on the transmitter output, but on it's working LNA and/or the output at the receiver.
Looks to me as if the LNA is not activ.
I am using two F802 with Midelic's firmware with a CC2500 module on the 7e or a DFT module on my Futaba and get telemetry still beyond 500m.


Edit:..meanwhile read the LNA could not be used, what a pitty.

Devo7e, TaranisQ X7, R9M , 4in1 MM, Futaba FC18plusV3.2 & DFT/FLD-02
Last edit: 01 Mar 2016 11:51 by aMax.

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01 Mar 2016 16:56 #43954 by TomPeer
Replied by TomPeer on topic 3in1 / 4in1 RF module
I think i forgot to take breath for a few minutes, but i also think the first step was succesfull.



The rest is for tomorrow.

This is the 8s, pin 89. I suppose i should use B3 as pin select in the hardware.ini?
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01 Mar 2016 17:37 #43955 by Deal57
Replied by Deal57 on topic 3in1 / 4in1 RF module
That's the port that is used by that pin. Let us know if it doesn't work.

Nice solder work!

Deviation Devo7e 3way switch mod, A7105, NRF24L01
Devo6s 2x2 switch mod, trim mod, haptic, multimodule, A7105, NRF24L01, CC2500
Devo12e 4-in-1 with voice mod -- it speaks!!

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01 Mar 2016 17:59 #43956 by TomPeer
Replied by TomPeer on topic 3in1 / 4in1 RF module
Thanks, i will let you know how this works out.

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02 Mar 2016 00:03 #43964 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module

TomPeer wrote: I think i forgot to take breath for a few minutes, but i also think the first step was succesfull.

The rest is for tomorrow.

This is the 8s, pin 89. I suppose i should use B3 as pin select in the hardware.ini?


Wow ~~~ nice work! :woohoo:
it's a mission impossible for me. :lol:

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02 Mar 2016 06:58 #43970 by Richard96816
Replied by Richard96816 on topic 3in1 / 4in1 RF module

dc59 wrote:

TomPeer wrote: I think i forgot to take breath for a few minutes, but i also think the first step was succesfull.

The rest is for tomorrow.

This is the 8s, pin 89. I suppose i should use B3 as pin select in the hardware.ini?


Wow ~~~ nice work! :woohoo:
it's a mission impossible for me. :lol:


Easy if you prepare well and take your time. A clean soldering iron helps.

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02 Mar 2016 07:35 #43973 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module

Richard96816 wrote:
Easy if you prepare well and take your time. A clean soldering iron helps.


Very useful video , thanks a lot. :woohoo:
It's the method taht Deal57 mentioned at post #43907.

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02 Mar 2016 07:38 #43974 by dc59
Replied by dc59 on topic 3in1 / 4in1 RF module
Thanks for Hexfet's help, now I can get RSSI data on my 8S, but it's only be displayed at main page.




Is it possible to move it to telemetry monitor page?

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02 Mar 2016 19:55 - 02 Mar 2016 20:02 #43988 by TomPeer
Replied by TomPeer on topic 3in1 / 4in1 RF module
hello again.

I can confirm that dc59 method to ad a third module also works on the Devo 8S. I used pin 89 to solder the csn to.
this is my hardware.ini:

;Only useful for transmitters with an after-market vibration motor
;enable-haptic=1
;
;switch_types: 3x2, 3x1, 2x2
;extra-switches=
;
;button_types: trim-all, trim-(left|right)-(up|down|both)
;May occur more than once if necessary.
;extra-buttons=
;
[modules]
; there is no need to enable the cyrf6936 module unless
; it is wired to an alternate port. It is Enabled automatically otherwise
; enable-cyrf6936 = B12
; has_pa-cyrf6936 = 1
enable-a7105 = A14
has_pa-a7105 = 1
enable-cc2500 = B3
has_pa-cc2500 = 1
enable-nrf24l01 = A13
has_pa-nrf24l01 = 1
; enable-multimod = A13

and all modules are recognized.

I have a frsky rx on the way, so i can only test when that arrives. But all looks good.

Thanks.

Tom
Last edit: 02 Mar 2016 20:02 by TomPeer.

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