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MB808 how connecting BPM Digit on DOUT


zephyrin
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The default configuration is:

 

; === BPM digits ===
;
; set to 1 or 2 to enable the 3 optional BPM digits
;    0: BPM digits disabled
;    1: digits with common cathode
;    2: digits with common anode
#define DEFAULT_BPM_DIGITS_ENABLED 0
;
; define the shift register to which the segments are connected (0=disabled)
#define DEFAULT_BPM_DIGITS_SEGMENTS     5
; define the shift register to which the common pins (cathodes or anodes) are connected (0=disabled)
#define DEFAULT_BPM_DIGITS_COMMON       6

 

 
You would have to set the DEFAULT_BPM_DIGITS_ENABLED either to 1 or 2, depending on which LED digit you got (your link doesn't make this clear).
 
Here a link to the MBSEQ V4 schematic: http://www.ucapps.de/midibox_seq/mbseq_v4_bpm_digits.pdf
MB808 only supports 3 digits (since BPM is working at .0 resolution), therefore connect:

- the common line of the first digit to D2 of the DEFAULT_BPM_DIGITS_COMMON DOUT
- the common line of the second digit to D1 of the DEFAULT_BPM_DIGITS_COMMON DOUT
- the common line of the third digit to D0 of the DEFAULT_BPM_DIGITS_COMMON DOUT
 
Best Regards, Thorsten.
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No, unfortunately the DEFAULT_BPM_DIGITS_COMMON assignment allocates the complete SR

Reason: if you would add additional LEDs, they wouldn't be so bright anymore since the DOUT is used as current source for all 7 segments of the digit.

Therefore such an option hasn't been considered in the firmware configuration.

 

Best Regards, Thorsten.

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