# common cathode seven segments

**URL:** <https://forum.arduino.cc/t/common-cathode-seven-segments/46079>\
**Category:** Syntax & Programs\
**Created:** [January 23, 2011, 1:18am UTC](https://forum.arduino.cc/t/common-cathode-seven-segments/46079 "2011-01-23T01:18:05Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [January 23, 2011, 1:18am UTC](https://forum.arduino.cc/t/common-cathode-seven-segments/46079/1 "2011-01-23T01:18:05Z")

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ok so how do i get the arduino to ground the cathodes on my seven segments. also how do i multiplex???

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**Author:** ![pwillard](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/pwillard/32/213565_2.png) [@pwillard](https://forum.arduino.cc/u/pwillard)\
**Post date:** [January 23, 2011, 3:36am UTC](https://forum.arduino.cc/t/common-cathode-seven-segments/46079/2 "2011-01-23T03:36:16Z")

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> **[Multiplexing 7 segment LED displays with Arduino](https://jeremy.geek.nz/2010/04/19/multiplexing-7-segment-led-displays-with-arduino/)**
>
> Here’s an example on multiplexing three seven-segment LED displays from an Arduino using a single 4511 IC and a handful of transistors. This builds on my last post about interfacing to a sing…

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**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\
**Post date:** [May 6, 2021, 8:13pm UTC](https://forum.arduino.cc/t/common-cathode-seven-segments/46079/3 "2021-05-06T20:13:12Z")

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