Inside the 3D printed frame of the GlowBlaster is a 5 mW 405 nm module, an Arduino Nano, a speaker, a vibration motor, and a 9 V battery. When you pull the trigger, it pushes down on a 12 mm ...

The main circuit is rather simple. An Arduino is hooked up to both an ultrasonic distance sensor and a vibrating motor. The distance sensor uses sound to determine the distance of an object by ...