By Kristen McIntyre View In Digital Edition
Here’s how to build an all-electronic "dunking" booth with a reliable shock sensor to put behind a target that only triggers on a bulls-eye. Also covered is how to change a sensor that goes LOW when triggered to going HIGH instead, and building a timer or motion sensor of some kind that will trigger a model train that runs through a library’s Children's Books area so that it only runs when kids are there.
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