So you would like to build a clock that can be only silenced using a Nerf dart? Christopher Guichet has shared a video that shows his Arduino Nerf Target Alarm Clock. It uses a piezoelectric sensor to detect hits. In order to deactivate the clock, you will just have to shoot it.
Arduino Nerf Target Alarm Clock (Intro to Piezoelectricity)
The clock is driven by an Arduino Uno. It has a 3D printed housing printed using an Ultimaker 2+. Yet another fun DIY project.
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