The initial objective was to incorporate these displays as front panel to the mini68k, as usual I try to prototype it with the Arduino. It ended up as being quite hard, you must compose the characters as "bitmap" graphics, then shift the 24 bits for "column" one of all the displays, then activate column one for 2ms... then repeat to column 2 to 5.
So first you must compose the combined display bitmap from the individual characters, then shift a sequence of bits and activate the respective column. To do it proper you must have in memory a bitmap for each character, compose the "screen" and the shift the bits and activate the columns in sequence.
As you can see from my first program... it didn't go well... unless you're the Predator and your personal nuke is counting down...
A few more head bangs against the wall et voilà...
7 comments:
Hi,
Great project, but what components did you use? Is that a voltage regulator & how is it used?
Did you manage to connect more than one display to an Arduino?
Steve
Hi Steve, thanks for commenting..
The voltage regulator is "a left over" from the SDCard experiment, it is not used for the display. I didn't try to connect more than one, I think one or two more (8 to 12 chars) is manageable, from then on bit-banging the bits one by one might have some noticeable flicker.
JS
Dumb question I am sure... but is that a capacitor between vcc and gnd?
Dumb question I am sure but is that a capacitor between vcc and gnd?
Yes, I've used an old tantalum capacitor (the blue blob above the display 33uf, 16V).
i have some of these too and i looked everywhere but not much, can you help me make a clock with one of these? with an arduino and rtc module
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