Complete instructions for this episode of Weekend Projects can be found at http://makeprojects.com/Project/Hot-Cold-LED/2445/1

Combine an Arduino, an ultransonic distance sensor, and some common components to build a classic “hot/cold” project. Once assembled, we’ll walk through the software “sketch” loaded onto our Arduino, and experiment with three variations of the “hot/cold” theme, all the while using the same circuit.


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