[sdiy] DOTCOM Analog Sequencer.. next project startup..

[Timothy Daugard]

Rotary encoders: Only one needed (usable)? Scanning a row of encoders 
would be meaningless as the will only have the current bit.

CV Pots: 16 good pots cost far more than one encoder.  From description 
you would almost need 10 turn pots.

Development time: Pots - quick, uP based encoder and associated software 
- lengthy.

I've been playing with MSP430 processors for a few years. Learning curve 
has been interesting. MSP430 chips are available through hole. Costs are 
low. Latest development kit is $9.99 plus shipping from TI, about $12 
from Mouser:

Stopped to look it up:

MSP-EXP430G2ET  - $11.76

MSP430G2231IN14 - $1.82 (my 14 pin goto)

MSP430G2553IN20 - $2.69 (my 20 pin goto)

Development Software - free

I'm sure there are other processors that can be used, I just never 
started with them (PIC, Ardino).

Meanwhile I've built an 8 step with a 4 step multiplexer with CMOS 
chips. While an 8 step with the MSP430 is still on the dream sheet.

Tim Daugard

On 7/23/2020 7:07 PM, Jean-Pierre Desrochers wrote:
> I'm starting to think about my next DOTCOM analog module:
> a 16 steps sequencer (maybe 32 steps).
> So far I'd have 2 choices for the final number of steps CV adjustments.
>
> - Standard CV pots sequenced with gates
>    pros: cost is cheap, the note value is physicaly kept by each pots
>    cons: bad note precision on large span (I'd like a 61 notes span on each
> CV adj),
>                span must be kept not too large..
>    
> - Rotary encoders
>    pros: Very large CV span can be achieved on each steps (beyond 61 notes),
>               quantization easy to be achieved on each steps adjustments.
>    cons: expensive (are they all ?), need for data memory to keep every note
> values (micro-processor needed)
>    
>
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