(Expand for Errata) Previously, we looked at the 8×8 LED Matrix. We noted that, since it needs 16 pins to power, we’ll have to sacrifice quite a lot of pins on the microcontroller. I left this as an open question at the end of that episode, which you can watch here →
In this video, we try to look for ways to cut down on the number of pins, through use of our trusty 74HC595N shift register! We first looked at this nifty little component, which helps store one byte of data, in this video →
By combining two shift registers with the LED Matrix, we can eliminate almost all of the pins used to drive the matrix. What’s even better is, the first shift register can drive the second, reducing our pin count down to just 3.
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= ERRATA =
Please note the mistake at 9:10 – In the diagram, the shift and store pins have been reversed. The store pin should be above the shift pin. Thank you very much to Joshua Thyer for pointing out the error!
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