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.
More gadgets like this: here
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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