How to connect a 4 Digit 7 Segment Multiplexed LED display to Arduino UNO??

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i complete beginner arduino , electronics. 1 of tutorials doing required me use 4 digit led display 12 pins. ordered online different in tutorial unfortunately. want know how interface led arduino uno have.

where pins go?

please help!

you left out 1 critical piece of information: common anode or common cathode ?

please post link vendor's website display.

quote
i want know how interface led arduino uno have.  
maybe so, until know how know leds can't answer question.
do know how connect led (any led) ? (do know cathode , anode mean ?)

the pins marked. don't know if active high (common cathode) or active low
(common anode). don't know if digit enables active high or low.

look @ this display.

look familiar ?


you can see digit enables drive transistors, makes them active high.
you can see in order segment light, corresponding segment pin must high.

you need make table lists segments required each number  and create functions for
each number. there other ways it, port writes using 8-bit port , writing constant
defined combination of 1s , 0s light particular number. constant in form
b01111111 (binary).

take @ this

it seems me asking wrong question. question should asking is:

quote
how research topic find necessary documentation , instructions build circuit , write code ?
the answer is:
google topic keyword "arduino" @ beginning of search , keywords
"schematic" , "code" , "tutorial" @ end of search:

ie:
"arduino 4-digit 7-segment display schematic example code tutorial"

think ? difference between lighting single 5 mm red led using resistor , lighting 4-digit 7 segment display resistors built in ?

is code different. not depend on whether common cathode or common anode ?
is not anode more positive respect cathode ?


Arduino Forum > Using Arduino > General Electronics > How to connect a 4 Digit 7 Segment Multiplexed LED display to Arduino UNO??


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