procurando ideias para viabilizar pedais com FV-1, esbarrei na solução do FSB, é muito simples, um pic12f675 e um potenciômetro. O Vídeo abaixo mostra funcionando:

https://www.youtube.com/watch?v=niVOomlajlE

O código, também não mata ninguém - só adaptei (pouco) para usar o piklab no linux:

Code Select Expand


; -----------------------------------------------------------------------
; Template source file generated by piklab
#include <p12f675.inc>

; based on code by slacker
;3 bit glitchless A2D converter
;Version 2 12/10/2013
;          __________
;   VDD ---|        |--- VSS
;       ---| 12F675 |--- Bit 0
; CV In ---|        |--- Bit 1
;       ---|________|--- Bit 2

   
  __CONFIG _INTRC_OSC_NOCLKOUT & _WDT_OFF & _PWRTE_OFF & _MCLRE_OFF & _BODEN_OFF & _CP_OFF & _CPD_OFF

    UDATA 0x20

new RES 1
current RES 1
count   RES 1

    org 0

Start:
    banksel GPIO
    clrf GPIO          ;clear GPIO
    movlw 07h
    movwf CMCON        ;turn off comparators
    banksel ANSEL
    movlw b'00010000'  ;set pin3 as input rest as output
    movwf TRISIO
    banksel ANSEL
    movlw b'00011000'  ;set pin3 as analogue input (AN3)
    movwf ANSEL
    banksel ADCON0
    movlw b'00001101'  ;turn on ADC on AN3 left justified
    movwf ADCON0

Mainloop:
    nop                 ;wait for a bit
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    nop
    banksel ADCON0
    bsf ADCON0,GO       ;Do ADC
    btfsc ADCON0,GO
    goto $-1

    banksel ADRESH
    movf ADRESH,w
    movwf new           ;write upper 8 bits to new register
    swapf new,f         ;swap upper and lower bits
    rrf new,w           ;move 1 step to the right bits 5,6,7 now in positions 0,1,2
    andlw b'00000111'   ;clear 5 upper bits
    movwf new           ;write back to new register
    subwf current,w     ;subtract from current value
    skpz                ;skip next line if zero ie:- new = current
    goto counter        ;if new <> current goto counter
    movlw b'11111111'   ;reset count to 255
    movwf count
    goto Mainloop       ;back to the start

counter:
    decfsz count,f      ;deduct 1 from count, if count = 0 skip the next line
    goto Mainloop       ;if count > 0 go back to the start
    movf new,w          ;if count = 0 move value of new to current
    movwf current
    banksel GPIO
    movwf GPIO          ;and send to GPIO
    goto Mainloop       ;back to the start

    end


Muito bom, Haroldo!!   :tup


Vai ser muito útil aqui!   (brav)