I enjoyed that too and I liked your guitar work .
Will you post a schematic and code?
Also I can't download Utube videos is it possible to give a download link that I don't have to log into to download
I just won't support these tightening controls on who posts and who downloads all over the net . It will just keep getting worse if we accept it..

I'm not sure if I understand why do you need to download video.
I need to make one nice main diagram and upload it.
My project went through many phases while I added more and more components.
Right know it's real schematic mess on several sheets. They are mostly written by hand on piece of paper and I didn't really use right symbols all the time.
I hope I will manage to understand each of them and make a one clear pdf because I'm going to need it.
I can upload the code, that part would be easy. I need to get home first.

That is very cool, and the mods on the guitar aren't intrusive (or even obvious until you flick the controls in the vid and give their positions away).

Would it have been possible to put these controls on a strap-mounted enclosure or do they need to be tied into the guitar's electronics?  Reason for asking is part laziness because I have more than one guitar...and part not wanting to cut my axes.  To be fair, part 2 is probably the primary reason

Very inspirational stuff - thanks for sharing,
Geoff

I don't know if you have seen whole video because I showed my old transmitter which can be taped on any guitar and no modification is needed.
Mounting on strap would be possible too.
I never cut my guitars. New transmitter is mounted through the hole where the original tone control potentiometer is usually mounted.
The potentiometer is turned to max and hidden inside the guitar.

Anyway transmitter doesn't share any wire with guitar electronics.
I hope this helped.

I finally got it on the video. I would use this opportunity to thank you all who helped me to get so far with this project.
For those who are not familiar with guitars, amp and gigging:
I made this to be able to control my amp and effect pedals wirelessly from my guitar.
This allows me to move on the stage and still be able to switch on/off some effects or amp channels.
I'm connected to amp by ordinary instrument cable on this video but I use guitar wireless system during the live show.
http://www.youtube.com/watch?v=aJmPjkDfolA&feature=youtu.be

Just a little update:
I connected arduino and microservo to battery so
they had no common wires with my other circuits.
It worked perfectly without any noise. I'll run a couple more
tests to find out what caused problems first time.
This time I had all our rig in different building where we played the gig.
I'm going to test it again in old building where we do our rehearsals.
I'll try with DC adaptor too.

I wonder is there any way to prevent this noise... Maybe micro servo and audio equipment just don't work together.

Electric guitars/amps are Hi-Z input and it's very easy for noise to couple into it.  (example: AM radio, RF buzz, fluorescent lamps, etc)....

I suspect the micro servo motor (unshielded even!) butt up against the metal case of the amp is a sure fire way of transmitting the EMI/RF noise of the servo to your amp.

You can try "mechanical shielding", see faraday cage, and then grounding that metal case. But the fact that it's supposed to be butted up/pressed against your guitar amp (to be able to turn the knob) I don't know if that will still be effective. 

Thank you,
I was thinking of faraday cage and installing servo on volume pedal not direct on the amp but ... it wouldn't be exact what I had in my mind.
I would like to use this device on GAIN knobs mostly not on the volume master.
Maybe I'll try test it with de-coupling first and take it from there.

Let's say I run arduino on 9V DC buttery and my pedals are powered by 9V DC switch adaptor.
Can I still connect grounds together?

I once tried to make a common power supply for a collection of five peddles for my son, to replace all the batteries. The result was that two of then went up in smoke.
It turns out that they have what is known as earth lift resistors in place to cope with common grounds on the signals. There was not a common power ground. In the end I had to make five small mains powered isolated supplies, one for each peddle.

So beware trying to power two things off the same circuit. Test first to see that there is a common ground on the supplies.

Hello Grumpy_Mike,
Thank you for your input. I've been connecting several pedals to very same power supply in many years ( 30+). So it works.
There are many pedal boards ( Like Boss BCB60 or BCB30)on the marked  where 3 or 6 pedals share common none isolated power supply.
http://www.bossus.com/gear/productdetails.php?ProductId=610
Of course I too think isolated power supply is best.
Still when all those pedals are connected in series they share common ground by their screen wire. Aren't they?

Rolland Boss power supplies unlike many others have +9V and ground swapped in the pin. If you connect wrong pedal to it that has no protection diodes it could result with the smoke.

Thank you!

Thank you guys,
I spent most of last two days reading about de-coupling. It makes sense but I never figured out how
to do it in my case.
If it was only my amplifier it would be clearer to me, but how to prevent noise in PA?
PA has nothing common with my amplifier and my pedal board. But it looks like the noise affects PA through main 240V AC power supply.
The building is old and probably bad electrical system but still...

I think I'll try to run my servo and arduino on battery and see what happens.
Then I'll try to experiment with metal box and shielded servo cable.

What do you guys think about battery as power supply for servo and arduino?

There are guitar tuning systems on the marked which run on the battery.
They're probably controlled by a microcontroller and driven by special servos. They don't affect amplifiers arround them.


Another critical question:
Let's say I run arduino on 9V DC buttery and my pedals are powered by 9V DC switch adaptor.
Can I still connect grounds together?

thanks

Good read!
Thank you for sharing...

Hello,
I have built a wireless pedal board. I can now control my amp and my effects from switch panels taped on my guitars.
Effects are located in a box and connected to my amp by short patch cables (mono 1/4 jack).


So I tried to add a new function, kind of programmable volume control by using a micro servo. 
I have chosen this el-mechanical solution because I didn't want to modify my amplifier.
I was afraid that two sided tape wouldn't be strong enough to hold servo in position and worried about hundred other things.
See video clip: http://youtu.be/yxiDniBHDig
Both mechanical transmition and arduino sketch turned out to work perfectly but micro servo caused another problem:
Audio noise, a lot of audio noise, booming, buzzing and popping noise.
Not only from my amp but it affected PA and few other amps in the room.
(You can't hear the noise because I don't have a speaker cabinet at home so amp was off while I was recording video)

I wonder is there any way to prevent this noise... Maybe micro servo and audio equipment just don't work together.

Thanks for the info!
I can live with that! Fortunately I never used them outside so once I get
inside, they soften up after a while and I can unfold them.
Still, I would like them more if they were more flexible.

I'm not sure I understand exactly what you are asking for, but if you are wanting to connect 6 wires, one thing you might think of is a RJ-45 connector that is used for ethernet cables.  You can buy the female plugs that you can attach wires to at places like Radio Shack or Home Depot.  For example here is Radio Shack's version: http://www.radioshack.com/product/index.jsp?productId=2102539#

I use network adaptors and cables for my project. They are almost perfect but I do have a little problem.
They are often very stiff and if I take them out in cold winters day they just stay folded for a long time.
I found a flat type of network cable on the internet but nobody can tell me if they are stiff or not.

Is there anyone who's tried one of those?

This is exactly what I had in my mind! Only thing I am worried about is
how to isolate those two 9V outputs.
But, I'll try it first with no isolation and see if
it gets noisy. I can always use separate 9V adaptor like I do
at the moment but it would really be great if I could use
only one power supply cable.

Thank you!

Do I need an extra heating tank for it? Or maybe
there is no need for it if the current is less than 1A???

Thank you for your help guys.
I'm going to order one linear and one fixed converter and see how they behave in my circuit.
I'll monitor heating and audio noise and decide later which one is most suitable for my application.
(I guess, the cheapest one is gonna lose, but we'll see)
Anyway, the price is not really issue here since it costs nothing comparing to what I paid for my guitars and the amplifier.