Summary

I used stored gravitational potential as the operating principle for my device. The servo turns and pushes an eraser which is attached to the first level by wire. The eraser falls off the edge and pulls the rest of the apparatus down with it, thus producing a pratfall. The device is constructed with laser-cut 6mm plywood parts and put together through a series of simple inserts. The servo motor is attached to the second level of the device with a screw attachment.

Video

Solidworks Files

Pratfall Solidworks Files – mgshin

Arduino Code

#include <Servo.h>

const int PIN = 7;
Servo push;

void setup() {
  push.attach(PIN);
  push.write(0);
}

void loop() {
  push.write(180);
  delay(500);
  push.write(0);
  delay(10000);
}