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1  Using Arduino / Audio / Re: 64 pots controller question on: June 19, 2011, 04:48:39 am
I totally agree, it will be about 3 times more to solder .. but it will grab some pins and eat some resources from atmega which i could use differently

i don't mind to solder more smiley practice makes a master
2  Using Arduino / Audio / Re: 64 pots controller question on: June 18, 2011, 12:00:37 pm
thanks, i'll make some tests on monday.
3  Using Arduino / Audio / Re: 64 pots controller question on: June 18, 2011, 09:04:12 am
i have one more question .. since all of you guys sugest a pwm controll for the leds .. i thought of another scenario

the idea is quite simple
1. add a triangle wave generator that outputs 0-5v tri wave like this one

2. put a small comparator for every led .. for instance MCP6541
3. compare the triangle wave with pot output to generate proper pwm signal for leds

will this work?
4  Using Arduino / Audio / Re: 64 pots controller question on: June 17, 2011, 11:29:49 am
ok, for now i will try to do a test without driver ic's .. and than if it's not ok, i'll be back with some questions about tlc5940

thanks
5  Using Arduino / Audio / Re: 64 pots controller question on: June 17, 2011, 09:59:39 am
Hi, thanks for your tip.
Will this ic allow me to change brightness of individual leds?
6  Using Arduino / Audio / Re: 64 pots controller question on: June 17, 2011, 03:43:41 am
something like this maybe?


i don't have the parts to test it yet .. is there a chance that this will do the trick?
7  Using Arduino / Audio / Re: 64 pots controller question on: June 16, 2011, 09:27:59 am
i have already ordered 10k linear pots ..
what if i put a diode and resistor to lower the potentiometer resistance and make it kind of anti-log (like here http://sound.westhost.com/pots-f9.gif)?
will this help to light to leds?

thanks .. i will make termals for all components


thanks for reply
8  Using Arduino / Audio / 64 pots controller question on: June 16, 2011, 06:51:25 am
Hi, this is my first post on this forum ..
i'm designing a 64 pots controller thats made from atmega328 and four 4067 multiplexers. The design is fairly simple, atmega will be populated with arduino code and output simple cc midi data thru serial midi. I've added leds for every potentiometer to show values via brightness.

I have to add that i'm not an educated electronician smiley so if you could point out some mistakes, things that could be done better .. i would appreciate it very much.
I've attached my schematics and board layout.

thanks
michael


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