Addressable 7-Segment Displays
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Author: Andrei
6/02/2019
7 segments display are fun. But each display would need 7 connections, one for each segment and also the ground pin. Also, showing numbers one by one is quite difficult. That's why we use some special ICs to control the segments.

SeanHodgins YouTube channel posted his work on some adressable 7 segments modules. This tiny PCBs are usign 7-segments drivers to control the LEDs and display numbers or letters. And even more, the data from the first chip could go to the next and by taht create a string of numbers uisng multiple modules in series. And we can communicate with all at once using just the serial data pins.

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Use only 3 wires to control an infinite number of 7-segment single digit displays! The module uses the Adafruit WS2811 IC to control the LEDs. This tiny SOIC-8 is fairly easy to solder and can drive a single common-anode RGB LED or three single-color LEDs of your choice. (The outputs are NPN transistors so they won't work with common-cathode!) The outputs are each ~18mA constant current so the color will be very consistent even if the voltage varies, and no choke resistors are required making your design minimal.

That's how we control these segments and by taht we only need 3 connections for multiple modules instead of 7 for each module. Pretty nice, right?


This makes them super simple to daisy chain, control, fade, do all sorts of things! He also made a code using the Adafruid library as a demonstration. As usual, as all his projects, this one as well is open source. If you would like to build your own, all of the resources are available in the GitHub. For more, check SeanHodgins and see his projects. Thank you.

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Blog#42 - Addressable 7-Segment Displays


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