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October 9, 2017 AT 1:30 am

Make a Stranger Things Digital Ouija Board using regular LED’s #ElectronicHalloween

Adafruit halloween2016 blog

Stellar Stranger Things themed Halloween build from Josh from BreakoutBros.com up on Hackster.io.

In order to use less I/O pins we will be using a 5×5 matrix. This will cover letters A-Y. For Z it will have its own pin. From looking at the schematic above, you can see that in order to turn on one LED the row will turn high and the source will be set low. For example. To turn on A, PIN 2 will be set High and Pin 8 will be set low. This will only turn on A. Each combination of having one ROW  set as a high with the other ROWS being set to LOW and one column set as a low with the other columns set to HIGH will only tun on one LED at a time. This uses 10 pins + 1 to do all 26 letters. This utilizes a lot less I/O pins than having to have one I/O for each LED.

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