- Sat Aug 04, 2007 5:28 pm
#33333
The brand I'm using are Lite-On LTST-C150KRKT (Digikey PN
160-1405-1-ND), and are available as rear mount LTST-C230CKT
(Digikey PN 160-1186-1-ND). This creates more options!
placed physically in any pattern. A 7x9 (63 LEDs) would require a
LUT to map the ASCII data to a font that lights the right LEDs.
I'm thinking of doing a 2:1 aspect array, originally 16 x 8, but
now 14 x 9 to have two characters that can scroll left and right.
There might be some merit to divider column or two between the
characters, but that really throws the math off for the MAX
drivers. However, 16 is a binary friendly number, so perhaps
logic shift registers for the columns make more sense?
I'm heading towards a two-digit clock, HH blank MM sequence.
Comments Welcome!
Lucien wrote: On the subject of "viewable from the rear", I've seen some SMD LEDs made for reverse mounting, where the LED is meant to shine through a hole in the PCB between the pads. I think they were made by Avago.Greetings Lucien,
The brand I'm using are Lite-On LTST-C150KRKT (Digikey PN
160-1405-1-ND), and are available as rear mount LTST-C230CKT
(Digikey PN 160-1186-1-ND). This creates more options!
Lucien wrote: Would a 7x9 be doable with the 7219/7221? I wouldn't have thought you'd be able to swap the function of a line around on these chips.Sure, the array is 8x8 or 64 separately driven LEDs. They can be
placed physically in any pattern. A 7x9 (63 LEDs) would require a
LUT to map the ASCII data to a font that lights the right LEDs.
I'm thinking of doing a 2:1 aspect array, originally 16 x 8, but
now 14 x 9 to have two characters that can scroll left and right.
There might be some merit to divider column or two between the
characters, but that really throws the math off for the MAX
drivers. However, 16 is a binary friendly number, so perhaps
logic shift registers for the columns make more sense?
I'm heading towards a two-digit clock, HH blank MM sequence.
Comments Welcome!
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