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Picture of The Cold Shoulder

-This project was conducted as part of the Computational Design and Digital Fabrication seminar in the ITECH masters program.-

Know someone overly extroverted and who just can’t stay quiet? This guide will show you how to create an inflatable necklace that chokes the person wearing it whenever he tries to speak...

Joking! Let’s not choke anyone and do this project just for fun!

The necklace consists of two PVC cushions filled with liquid and an inner PVC cushion that inflates and lights up thanks to a vacuum pump and a LED strip. On the back hangs a control box that houses the microcontroller, batteries, vacuum pump and all the electronics needed.

The aim of this project is to create a wearable, easily made by anyone with readily available materials. The templates for the parts and the codes are provided.

Read on to see how you can make it…

Step 1: Find Your Materials

Picture of Find Your Materials


  • Arduino nano
  • USB micro to USB data transfer cable
  • 12v RGB LED strip
  • 12v vacuum pump
  • Sound sensor
  • 1 Push button
  • Breadboard (85mm x 55 mm)
  • Jumper wires
  • 1 9v battery
  • 4 MOSFET
  • 3 1 kΩ resistors
  • 1 2.2 kΩ resistor
  • 1 Diode rectifier


  • 1000 mm x 1000 mm PVC film
  • Liquid soap in the colors of your preference
  • Paper (baking paper or tracing paper)
  • Double sided tape
  • 4 m ribbon in desired color
  • Acrylic sheet 600 mm x 600 mm x 2mm.
  • Paper or cardboard in any color.
  • Double sided tape
  • PVC tube (5mm diameter)
  • PCV glue
  • Acrylic glue
  • Tape
  • 2 Pressure buttons


  • Iron or heatgun
  • Scissors
  • Pliers
  • Printer
  • Laser cutter
  • Funnel
Very interesting idea for a project!