# 3 digit multiplexed 7 segment display

**URL:** <https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292>\
**Category:** Look What I’ve Done\
**Created:** [October 29, 2018, 3:26am UTC](https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292 "2018-10-29T03:26:49Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![cesars](https://avatars.discourse-cdn.com/v4/letter/c/f05b48/32.png) [@cesars](https://forum.xod.io/u/cesars)\
**Post date:** [October 29, 2018, 3:26am UTC](https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292/1 "2018-10-29T03:26:49Z")

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hi, new library. It is still in development but you can try 🙂  
Link library [cesars/3-digit-multiplex-7seg](https://xod.io/libs/cesars/3-digit-multiplex-7seg/)

 ![3dig](https://canada1.discourse-cdn.com/flex027/uploads/xod/original/1X/9a669cc95372cdcc689aba15f26d6ca662c184f2.png)

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**Author:** ![nkrkv](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.xod.io/nkrkv/32/8_2.png) [@nkrkv](https://forum.xod.io/u/nkrkv)\
**Post date:** [October 29, 2018, 9:47am UTC](https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292/2 "2018-10-29T09:47:55Z")

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Hey, thanks for sharing!

It would be nice to see a scheme for the hardware setup. I see this is quite low-level driver as all segments are controlled directly with GPIO. I wonder how Q1, Q2, and Q3 are connected to multiplex the digits.

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**Author:** ![cesars](https://avatars.discourse-cdn.com/v4/letter/c/f05b48/32.png) [@cesars](https://forum.xod.io/u/cesars)\
**Post date:** [October 29, 2018, 1:42pm UTC](https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292/3 "2018-10-29T13:42:20Z")

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hi @nkrkv , I will soon load the scheme. There are several ways to connect, for common cathode digits, OUT’s segments a, b, c, d, e, f, g and dp by resistor 220 ohm. OUT’s Q1, Q2 and Q3 by NPN transistor with 10k resistor.

There is another simpler form, without resistor a, b, c, d, e, f, g and dp, between the NPN collector and the common cathode of the digit a 220 ohm resistor, in this case the intensity varies according to the active segments .

It can also be modified for common anode, soon

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**Author:** ![zfrenchy](https://avatars.discourse-cdn.com/v4/letter/z/278dde/32.png) [@zfrenchy](https://forum.xod.io/u/zfrenchy)\
**Post date:** [August 9, 2020, 6:34pm UTC](https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292/4 "2020-08-09T18:34:25Z")

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I am mlooking for 3 digit 7seg library, this one is the only one I found, but doesn’t exist anymore. Any other place I can found it ?

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**Author:** ![cesars](https://avatars.discourse-cdn.com/v4/letter/c/f05b48/32.png) [@cesars](https://forum.xod.io/u/cesars)\
**Post date:** [August 10, 2020, 1:23am UTC](https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292/5 "2020-08-10T01:23:45Z")

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the library that obsolete, and do not update it anymore.

But you can try with this library  
[dancojocaru2000/7-segment](https://xod.io/libs/dancojocaru2000/7-segment/)

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**Author:** ![zfrenchy](https://avatars.discourse-cdn.com/v4/letter/z/278dde/32.png) [@zfrenchy](https://forum.xod.io/u/zfrenchy)\
**Post date:** [August 11, 2020, 11:09pm UTC](https://forum.xod.io/t/3-digit-multiplexed-7-segment-display/1292/6 "2020-08-11T23:09:14Z")

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this library is for single digit, I am not fluent enough with XOD (at least yet) to make working for 3 digit, but if you ant help …