Laser Triggered Countdown

This is a simple arduino based project that consists of a laser tripwire that, when triggered, will begin a countdown sequence on red, orange and green LEDs. I designed this to be an easy project for someone learning how arduinos work (like me). This is my first instructable so please bare with me :) (I'll apologies in advance the picture quality, my phone's camera isn't too great) Let's Go! Step 1: Materia ...

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