WMP+NK direct connexion

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maxic31
Posts: 20
Joined: Wed Mar 09, 2011 5:41 pm
Location: Toulouse

WMP+NK direct connexion

Post by maxic31 »

Hi all!
Anyone tryed to connect WMP and NK in direct connexion method ?

Yesterday I tried to do that but without success or middle success...

My WMP alone in direct connexion work like a charm. But with NK on the same wire... arduino's LED blink continuously.

I have wired all components like this picture:
http://wbb.multiwii.com/download/file.php?id=57&mode=view

but with my version of NK:
Image
I hope I have not cut important things !!

On my MultiwiiConf, ACC is present. When I start arduino, ACC_Z increaze and stabilize to ~200. But no others activities :
Image

SCL signal :
Image

SDA signal:
Image

On SDA, voltage level is very bad... 2V contrarily to VDD 2.8V (OK on VDD of WMP and NK)

Software configuration:
#define ITG3200

#define NUNCHACK

#define I2C_SPEED 100000L

#define INTERLEAVING_DELAY 5000



I've tried many combination but without success :(


May be add other pull-up ? http://wbb.multiwii.com/viewtopic.php?f=6&t=178&start=10#p1591

User avatar
maxic31
Posts: 20
Joined: Wed Mar 09, 2011 5:41 pm
Location: Toulouse

Re: WMP+NK direct connexion

Post by maxic31 »



I think i should change my pull-ups resistor value. On my WMP, default pull-up values are 2,2Kohm.
From any electronic site, I read that pull-up can be in the range of 1k to 10k (http://www.i2c-bus.org/how-i2c-hardware-works/)

May be the best way for me is to try with greater pull-up value.

logitech888
Posts: 2
Joined: Thu Aug 04, 2011 10:11 pm

Re: WMP+NK direct connexion

Post by logitech888 »

Hi !
I get the same NK board as yours too. It work normal from the beginning . But it not work when I cut it to half.
I finally found the answer.
It work again when I connect it as the photo.
Hope it can help. :lol:
Image

josubh
Posts: 2
Joined: Tue Aug 09, 2011 6:07 pm

Re: WMP+NK direct connexion

Post by josubh »

logitech888 wrote:Hi !
I get the same NK board as yours too. It work normal from the beginning . But it not work when I cut it to half.
I finally found the answer.
It work again when I connect it as the photo.
Hope it can help. :lol:
Image

Hi, i´m a new member of this forum and i have NC ver GH0901B-PCB1 (2010-11-18) and see almost the same as yours.
Where you connect the red points of R4?

logitech888
Posts: 2
Joined: Thu Aug 04, 2011 10:11 pm

Re: WMP+NK direct connexion

Post by logitech888 »

Hi Joe.
Sorry for late reply!

I think this photo will help. Just connect like this.
Image

josubh
Posts: 2
Joined: Tue Aug 09, 2011 6:07 pm

Re: WMP+NK direct connexion

Post by josubh »

These bridges are for cutting the board?

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