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Multiple ADC channels in adc ATmega16

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prajankya

prajankya

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Hi,I want to design a usb audio mixer based on "GNUSB" but it gives only 6 inputs..
I want to design with more inputs since I don't need 10bit precession, n it will be useful since it is a mixer,more Pots means more controls...

If by any means I could use 2 to 4 pots per pin, it will not affect much on precession for they are simple 270 degree pots... I just want minimum of 10 readings thorughout a pot..

I cant use multiplexers here... Sorry there...

Anyone could help me please??
 

You could use some of the digital inputs. If you use the potentiometer to control the pulse width of a 555 oscillator (or similar), you can feed the output from the oscillator into a digital input, and use software to calculate the pulse width.

Harry Lythall used that approach to code 6 analog signals on one digital channel for a remote control system. Details are **broken link removed** and **broken link removed**. His homepage is here.
 
Great Idea.. It works, though I have to try it out for usb yet,but it works,..

But I thought of breaking that 10bit precession to 5bits...

means when in range of 0-5v, I get digital output of 0-1023 , n now I want out of 0-32...

That means now I have only 6 pots for 6 pins of 1024 resolution,but if possible, I can break that into 32 pots per pin, i.e. 192 pots for 6 pins of 32 resolution..

it will be a boon for making mixers...!!!

but please say, is it possible?? anyhow??
 

No, you can only connect one pot to one analog input, unless you use multiplexing. btw, I thought the GNUSB had 8 analog inputs, not 6?
 

godfreyl said:
You could use some of the digital inputs. If you use the potentiometer to control the pulse width of a 555 oscillator (or similar), you can feed the output from the oscillator into a digital input, and use software to calculate the pulse width.
Click to expand...

Thanx godfreyl... It works as charm... :smile:
 

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