Nobody Puts a Finger on My Butterfinger
So one of my friends is obsessed with butterfingers. Like absolutely obsessed. Her vice, and the old slogan used by Butterfinger (remember the commercials with bart simpson…) tempted me to think up this idea for the Form and Motion assignment.
The idea is very simple: a security box that protects a butterfinger by attacking anyone trying to steal it. If an unsuspecting thief puts their hand in the box a spiked paddle swings down on to them. The owner knows that a secret switch on the side needs to be pressed to safely retrieve the Butterfinger bar.
The mechanism is fairly simple: IR sensor mounted on top that when tripped caused a servo-powered paddle to swing down. When a button on the side, powered by a 9V external power source, is held down a Green “Go” LED is lit and the Servo is disabled.
The box is made out of foamcore. The paddle is a dowel attached to foamcore with thumbtacks as spiked in the foamcore paddle. This paddle worked well because it was light however I would have liked the paddle to be even faster and believe that this might be in part because of the weight of the paddle. The light diffuser on the green LED is a ping pong ball and everything else is just stuck together with red electrical tape.
Some stuff to mention: In the video the paddle will go down when nothing appears to be in the way. This is mainly because the IR sensor was tilted a tiny bit which caused objects to interrupt it even though they weren’t directly in the box. Also you might notice that the butterfinger is an empty wrapper…the project took me longer than expected and I got a bit hungry 😛
Arduino Sketch in comment