Open Project – Giulia Zefilippo 3179987

For my open project, I crafted two stretchable knitted sleeves that react (by fading LEDs) when the user stretches out their arms.

The project idea came from our class ideation exercise. Sleeves, stretching and relief. One of the core wearability concepts talks about creating wearable’s that are a “successful extension of the body”. For me, I have this habit of standing up and stretching my body. I wanted to recreate this feeling of extension into a material object. Whenever I stretch my arms, the material reacts to my movements and turns on LEDs.

Sketches of different ideas for the final completed wearable.
sketches_1Loom knitting the sleeves. Every few lines, I would measure the length and determine if it was long enough to move onto the next step.

The next step of the process was adding conductive thread near the bottom rows of each sleeve. I would test the resistant values while I was knitting to determine if there was enough resistance between the beginning of the conductive thread and the end. This process was done for both sleeves.

Next step was to knit a collar to hold the battery and cpx. I measured around my neck, arms, chest to determine how long I would need to knit for. The first step when you’re knitting yarn you’ve never used before, is to knit a swatch. This photo is a 6 inch swatch (not 27 inches).

This is planning out the placement of the LEDs. The sleeves were turned inside out. The LEDs were flipped downwards to avoid any uncomfortable poking and sewed on felt with conductive thread.

Coding part:

This part was fairly easy to put together. The more tricky part was trying to determine value parameter for each stretchy sleeve. Using the Arduino IDE and serial monitor makes it a lot easier to program the CPX.

Final Project Images (and video below)

Parts List

    • Yarn (preferably one colour or a matching colour).
    • Loom knitter.
    • Knitting needles.
    • Conductive thread.
    • PVC circuit wires.
    • Resistors (200 ohm, 56 ohm).
    • LEDs (plus 330 ohm resistors).
    • Fabric scissors.
    • Felt fabric.
    • Li-poly battery (850 mAh).

Circuit Diagram:

Reflections & Next Steps
The easiest part of this project was knitting (I had previous knowledge and experience). The most difficult part was deciding on which wires were conductive thread and which had to be PVC wires.

When reading the resistant values of conductive thread, you have to attach one wire at the beginning and one at the end. You need one wire not to interact with the knitted conductive thread parts. It’s not easy sewing and attaching a PVC circuit wire to knitted material.

This is one part that I struggled the most with and I will continue experimenting with different conductive materials and yarn to hopefully avoid using PVC circuit wire for the stretch component.

Next steps, I will continue knitting a sweater to attach to my sleeves.

Resources & Related Works

  • Arduino, & Arduino_Scuola. (2016, July 8). Tubolar Stretch Sensor Tutorial. Arduino.
  • Knit Stretch Sensors. (n.d.). Kobakant. Retrieved April 16, 2021, from
  • Knit Wrist Sensors. (n.d.). Kobakant. Retrieved April 16, 2021, from
  • Knitted stretchy cable. (n.d.). Kobakant. Retrieved April 16, 2021, from

Expressive Wearable Assignment – Giulia Zefilippo

The emotion I chose was serenity. When I researched this word, it meant calm, strong, unwavering. I wanted to express through a bracelet that even through movements, it still remains calm.
I created a bracelet that reacted to the movement of rotation on the x and z scale. The action of the user rotating the bracelet and activating the external LEDs is meant to express a slow breathing in and out. The CPX neopixels have a slow countdown to represent the direction of change.

My original goal was to create a bracelet that reacted to rotation movement. I wanted to express an emotion of calmness even when there’s a rough time.



Final Project Images:



Parts List:

    • Conductive Wire
    • Old t-shirt sleeve – sheer
    • 330 Ohm resistors x 8
    • Green and Blue LEDs x8
    • Sheet of thick fabric felt

Circuit Diagram:
circuitdiagramReflections and Next Steps:
I think spent too much time on this project. I chose a sheer black fabric to diffuse the LEDs but I believe they were diffused too much and barely visible. I think I would have chosen a brighter fabric that was also sheer for a second version. I think the achieved my goal of this project but I will have to improve the aesthetics for a second version.



Core Electronics. (2018, May 04). How to use the accelerometer on CIRCUIT Playground express WITH MAKECODE. Retrieved March 16, 2021, from

DiCola, T. (n.d.). Digital fidget spinner. Retrieved March 16, 2021, from

Assignment 1: Speculative Wearable – Giulia Zefilippo (3179987)

The Angry Belt activity tracker is a fashionable belt that senses your movements. If you haven’t moved enough in an hour, it will give you a gentle squeeze to remind you to move. It’s happy when you’re moving, but once you sit down for long periods of time, it will get upset and the belt will tighten its length.

scan-2021-01-18-21_00_02When the Angry Belt activity tracker is active, the front of the belt will show an angry red face on a display (which is part of the belt buckle). It then sends a signal to a tiny motor, which reduces the length of the belt and squeezes the user slightly. Once the user realizes the squeeze and they start moving, it will then sense the active movement and revert to its original length. Once the user achieves the movement goal, the angry face will turn into a green smiley face for a brief period and then go inactive.

My goal was to design an activity tracker that does not fit into the stereotypical fitness tracker. The user wouldn’t need to worry about an accessory or additional add-on because it would be an essential item. It’s also a tracker that pushes the user to be more active and not ignore it.

Paper Prototype:

Material Mood Board:
The Angry Belt activity tracker would be made from either a durable nylon string or flexible yarn material that could be easily stretched or constricted.

Similar Works:
Heart Rate Monitor Strap MZ-3. (n.d.). MyZone. Retrieved January 18, 2021, from
Stables, J., & Stables, J. (2015, December 23). Jawbone UP Move review. Wareable.