Shifting Bits With Arduino

I’ve recently started back into electronics. I took an electronics course back in high school, but I’ve dealt mostly with software since then.
I’ve had a Freeduino-SB sitting around since last year, until I finally soldered on the through hole components a few weeks ago. The Freeduino is an Arduino clone made by Solarbotics.

So far, I’ve managed to power a dual digit 7 segment display using two 74HC595 shift registers. These can be chained in series to provide more outputs from the same three output pins from the Arduino.

Arduino Countdown
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