1) 4 digits, but “2+2 independent”?
Yes, but not with seven_segment_multiplexer = value / put(word), because
that only formats one number across all digits. To do 2+2, you must set the
digit buffer per position (each digit is updated independently by the ISR).
-- up: 0..99 (displayed on digits 1..0)
-- down: 0..99 (displayed on digits 3..2)
var byte up = 23
var byte down = 99
procedure display_update_2plus2() is
var byte tens
var byte ones
tens = up / 10
ones = up - (tens * 10)
_seven_segment_multiplexer_digit[0] = ones
_seven_segment_multiplexer_digit[1] = tens
tens = down / 10
ones = down - (tens * 10)
_seven_segment_multiplexer_digit[2] = ones
_seven_segment_multiplexer_digit[3] = tens
if up < 10 then
_seven_segment_multiplexer_digit[1] = 27 -- space
end if
end procedure
2) Using seven_segment characters in the multiplexer
The multiplexer already uses seven_from_digit(...). So you can show any
seven_segment “character index” by putting that index into the digit buffer
(e.g. 10 = “A”, 27 = space, 34 = “-”, etc.).
_seven_segment_multiplexer_digit[0] = 10 -- "A"
_seven_segment_multiplexer_digit[1] = 11 -- "b"
_seven_segment_multiplexer_digit[3] = 27 -- "space"
3) Showing sbyte negative (e.g. -4)
Yes: display "-" (character index 34) on one digit and 4 on the other.
_seven_segment_multiplexer_digit[0] = 4 -- "4"
_seven_segment_multiplexer_digit[1] = 34 -- "-" (minus)
4) Digits set to input go blank; when set back to output the old value is
gone
To blank/re-enable while keeping the previous value, keep multiplexing
running and blank via the digit data (e.g., use space index 27) rather than
changing pin direction.
Matt.
On Monday, January 19, 2026 at 5:20:16 PM UTC-5 [email protected] wrote:
> Hi Matthew
> Hi Matthew
>
> I have some question about the lib 'seven_segment' and
> 'seven_segment_multiplexer'.
>
> 1 It is possible to connect 4 displays but is it also possible to use 2
> displays independent of the other 2?
> For example: 2 digits for up to 99 and 2 digits for down from 99
>
> 2 How can I use the characters of the lib 'seven_segment' in
> 'seven_segment_multiplexer'?
>
> 3 Is it possible to get a sbyte (-4) on the display?
>
> 4 When I make 2 displays 'input' their displays are off; when I make them
> 'output again the last information on the displays is gone and the displays
> give the start information. Is it possible the information will come back
> on the displays?
>
> Regards, Peet
>
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