Doorslam

Introduction: Doorslam

Doorslam is a simple protection mechanism against people slamming a door too hard.

YOU NEED

  • 1x Arduino Uno + PC
  • 7x Jumper Wires
  • Acceleration Sensor (in this example: MAKERFACTORY MF-4838286)
  • 5V Servo Motor
  • Optional: Breadboard

Step 1: 1. HARDWARE WIRING

Connect the pins in the following way:

ARDUINO ==> ACCELERATION SENSOR

GND ==> GND

3.3V ==> 3.3V

V4 ==> SDA

V5 ==> SCL

Using a breadboard here will make it easier later on to attach the sensor to the door. Direct connection does work just as well, though.

ARDUINO ==> SERVOMOTOR

GND ==> brown

5V ==> red

Digital 8 ==> orange

Make sure you use sufficiently long cables so you do not run into trouble later.

Step 2: CINEMATICS

Attach the accelerometer to the door at least 10cm away from the rotational axis.

Connect one end of a rope to the servo and connect a cushioning object to the other end.

Create a physical setup where the servo rotating causes the cushioning object to go up/down.

I achieved this by using two screws to guide the rope but feel free to be creative.

Step 3: Finalization

Upload this code to your arduino and have fun. Increase/decrease variable slamThreshold in the code to make the system more/less reactive.

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