[sdiy] arduino module mission

[Jason Proctor]

>On 28-Jul-09, at 2:05 PM, Jason Proctor wrote:
>
>>ok so you're patching away and you need another ADSR. unfortunately 
>>you're out of ADSRs, but you have an unused LFO. are you stuck? no, 
>>because you can just connect up your computer to the LFO and change 
>>its brain to be an ADSR instead. a normal enough mission by 
>>synth-diy standards.
>>
>
>Sounds like you could create a shield with I2C/SPI DAC, and set it 
>up so the shields could be daisy chained.  The more shields you 
>stack, the more DACs are added to the bus.  Maybe write an Arduino 
>library with some utility functions, or even a shield with a 
>dedicated DSP chip that the Arduino can send orders to over this 
>bus.  Am I getting warmer?:)

barf ;-)

the module is intended for use inside a modular synth. therefore it 
would be nice if it had a modular-type form factor, and modular 
power. the prototype Ard module is based on an MOTM-000 protoboard, 
so it has an MOTM power connector, onboard regulation for the uproc 
etc, PCB-mounted pots, etc. i just don't think the shield approach is 
really compatible with this aim.

i think the "final" version of the module will have an 8-channel DAC, 
because upgrading from the TLV5618 to the 5610 would require just a 
chip swap and a tweak to the driver code, *very* little effort. if 
you want more than 8 output channels, please check out projects from 
the smart people on the list :-)

i realise that trying to establish a platform might be futile, but 
i'm at least trying to keep a good balance of simplicity and power...

(does the Ard module sound attractive to people, in general?)