Laser-guided Ghost Climber using an Arduino

Almost inevitably, when I try to climb the same route I'll forget exactly what sequence of holds they used and end up following a slightly different path. Even when I remember exactly which course to follow, I'll still wonder whether I'm doing it as quickly as the previous climber. Yes, I know that skill in climbing isn't all about speed, but I'm competitive like that. That's how I decided to make a device ...

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