I am looking for an Eagle symbol for a 3-digit, 7-segment led display (the all-in-one units, not 3 individual 7-segments displays)
I am planning on use this with a a MAX7219/7221 chip, for reference during reading.
First… I have to ask about the differences between these two displays I found:
1 has 11 pins: (which might make more sense?..to me I guess? SegA-G + DP = 8, 3 digits = 3GNDS = 11 pins total?)
I searched and searched… and finally found a 3-digit, 7-segment display Eagle part/symbol…
but it has 12 pins…
SEGA-G + DP
C3 (which I’m assuming are the common grounds/cathodes?)
and then an “L” pin?
(possibly a LATCH pin perhaps?)
either way… I dont believe is the one/type of display I want to use in the schematic as it doesnt match any of the actual/physical displays I have found/will be using?
Anybody have one? a link to a lib with one? Used one in a project before?
Also some insight on these differences?
again… my current approach is to make a simple ‘backpack’ PCB (BOB) for this 3-digit display… with the MAX and vRegulator circuit(s) on the back…etc… (this is to be used as a counter)
the MAX needs 3 lines to the Arduino… and multiplexes so I don’t need to worry about high power requirements
3-digit_bob.zip (41.1 KB)