Feel The Pressure



Parts and Materials



  1. Adafruit Circuit Playground Express
  2. Scissors
  3. Marker
  4. 10K ohm Resistor
  5. Alligator to alligator clips


  1. Conductive Fabric (2 Pieces)
  2. Velostat (2 circular pieces)
  3. Handkerchief (Non-conductive fabric)
  4. Sewing Needle
  5. Black Sewing Thread
  6. Circle Marker
  7. Electrical tape

Circuit Diagram


GitHub Code

Feel The Pressure Code

Step by Step Instructions

  1. Take the electrical tape and trace its shape on the two pieces of handkerchief with the marker. Cut out the shapes.
  2. Take the circle marker and trace the bigger side on the two pieces of Velostat. Cut out the shapes.
  3. Flip the circle marker and trace the smaller side onto both pieces of conductive fabric. Add tabs to the traced shape and cut out.
  4. Place cut out conductive fabric onto the handkerchief. Let the overhang tabs hang over the handkerchief. Sew the conductive fabric to the handkerchief.10
  5. Place the Velostat over one side of conductive fabric. Do not cover the tab. Place the other side of the conductive fabric side face down. The tabs should be on opposite sides. Sew around the edges of the handkerchief to attach the pieces together.11
  6. Sew the Circuit PlayGround Express and the analog sensor to the sock. Attach one alligator clip from one end of the tab on the analog sensor to 3.3V and another alligator clip from the opposite end of the tab to the a 10K ohm resistor. That resistor also has an alligator clip connected to Ground as well.ezgif-com-optimize


How to Make an E-Textile Analog Sensor. (2020, May 30). [Video]. YouTube. https://www.youtube.com/watch?v=tA37mGEnPes

“Sensoria Artificial Intelligence Sportswear.” Sensoria Home Page, www.sensoriafitness.com/.

Electronic Accessories by Koli



1. LED Coin Purse

Description – LED coin purse is an electronic accessory that reminds the user to close / button the purse once they keep the coin inside. The coin purse has a small LED attached on one side, which lights whenever the purse is opened. This brings the user’s attention to close their coin purse before coins / money is misplaced.

Discussion – I would like to make a larger version of this bag with more LEDs that light up once it is opened, reminding the user to close it. Also, I would like to embed the circuit inside the purse so that the breadboard and Arduino is not out in the open. This reduces the aesthetics and usability of the bag.

Process and functioning – The bag has a copper taped button hole along with an aluminium button. Both of them are connect to the digital and ground pins respectively.The functioning is controlled by an Arduino Nano 33 iot. Once the button is attached to the button hole, the circuit is closed, this turns OFF the LED.


Code – https://github.com/Krishnokoli/Body-Centric-Technologies/blob/main/LED%20Coin%20Purse

Circuit diagram –





2. Pulsing Heart Brooch

Description – The Pulsing brooch is a wearable LED jewellery that is supposed to be worn on the shirt, blouse or any upper torso garment. The heart brooch has a unique capability of Pulsating once the area around it is touched by the wearer. This gesture is to convey the emotions of ‘Love’ or ‘Gratitude’ by the wearer. Since, we are socially distancing during the Pandemic, this jewellery can help create better interpersonal relationship between the wearer and their audience. This brooch is created with the help of an LED Matrix. The normal mode for the brooch is a LED heart display, on touching the area surrounding it, the LED heart patterns begins pulsating.

Discussion –  The prototype is to be improved further so as to create a more sleek brooch, which can come in different shapes, not simply an led matrix. I would also like to introduce other emoticons or icons to convey other emotions, triggered by different actions. I also want to place the push button onto the brooch, instead of putting it on the underside of the shirt (which was placed for the convenience of display).

Process and functioning – The brooch has two parts which are an led matrix and a push button. The push button, when turned ON, activates a pulsating pattern on the heart in the LED Matrix. The functioning is controlled by an Arduino Nano 33 iot. Below is an open demonstration of the circuit.

Code – https://github.com/Krishnokoli/Body-Centric-Technologies/blob/main/LRED%20Pulsating%20Heart%20Brooch

Circuit diagram –




3. LED Colour Transpose Bracelet

Description – This bracelet is an electronic wearable designed to change colour once it is secured on the user’s wrist. The colour values keep changing randomly at a regulated time interval, when the magnetic button is secured in place. On opening the button, however, the colour change pauses at the very last tone. The button attachment completes the circuit, hence it is like a digital button that initiates the colour changing functionality.

Discussion – I was inspired by pearly bracelets to create this piece, and would like to improve the aesthetics further by adding pearl beading on each led point. I was also confused about how to switch off the LED strip completely once the button was taken apart. Let me know if you know a code that could help me turn off the LED, when the digital button circuit is open.

Process and functioning – The LED Colour Transpose Bracelets have an two magnetic buttons placed on two ends of the bracelet along with the LED strip placed between them. The LED strip consisted of individually addressable 5V lights that were directly connected to the Arduino Nano 33 iot. The buttons were connected from- digital and ground. When they were connected, the circuit was closed and the LED strip was programmed to change into random colours at regular selected intervals.

img_20210222_160811     circuit

Code – https://github.com/Krishnokoli/Body-Centric-Technologies/blob/main/LED%20Colour%20Transpose%20Bracelet

Circuit diagram –


E-Textile Alpaca Weaving by Hortensia


In this project, I am trying to explore electronic textiles with alpaca fibre through weaving. From the class resources provided to us, I am interested in creating a textile circuit board, which for me is a to do task, I will try to do on coming project. In this assignment, I will present an e-textile prototype that I weaved with a little embroidery on top.


Parts & Materials List

Three sets of fairy LED lights
Ten yellow LED lights
Silicone Wiring
Arduino Nano 33 iot
Jumper wires with alligator clips on one side

Circuit diagram



See here

Prototype Development

Below the sketch of the weaving sample.


I did a loose simple weaving using two alpaca color wool: beige and light gray, I used a broken branch as a “loom”.


I embroidered a flower button in yellow and for the receptacle I used Peruvian natural cotton. I tried to find some nice colour combinations.


Below it is the final piece, the idea was to try to see how to create an e-textile using alpaca. I do not want lights compete with the weave, my goal is to enhance the beauty of the weave with the light. Later I could use this approach and weave lights in an outfit, like an alpaca poncho for example.


I used three set of white fairy lights and weaved them with the wool, I did this because the fairy light cord colour matched the alpaca wool color, light gray, in colour and size.

Small LED’s did not compete with the weave on the flower button and the tone of the yellow LED lights matched quite nicely. I would have preferred using Lilypad LED’s, because they are sewable and easier to use, but I did not like the look, they covered the embroidered part that I wanted to show. The option was to use simple LED lights, that fitted inside the embroidered flower button that matched the textile texture. When weaving the fairy light sets, I left the flower lights on before removing the batteries, that helped me guide the distance between lights (see below).



There are two fade effects, one going from high to low and the other from low to high. Two sets of fairy LED lights have one effect and the other the reverse effect.



Each led light on the button flower has an individual connection positive and negative because I wanted to turn them on and off in a sequence, as you could appreciate on the picture below and the YouTube video.




I am happy with the e-textile outcome. It would be interesting to try it on an outfit like a poncho or cape. Although I did not try on alpaca fabric, I think this type of lights will work well too.

My reflection about this project are, I found I need to improve how to connect the LED lights to the circuit. It was a little hard to connect the ten LED lights individually to the circuit, in a small space like the button flower. My idea is to use a printed circuit using conductive paint on a piece of neoprene, having the lights installed before the whole piece is sewed behind the back of the flower, having LED lights legs long enough so they can go through small holes in the weave.

Incorporating fairy lights into the weave went smoothly. Additionally, the color of the string matched the colour of the weave, light gray, and the size and colour of the lights was a good complement to the weave piece.




It was interesting to get started with e-textiles. I feel I still have a lot to learn and this is a field I would like to explore. I watched the links and resources provided to us in the course web site, the ones that called my attention were the E-Textile specifically the “Experimental Weaving” at the Unstable Design Lab, University of Colorado. I also liked the “Handwoven White Led Display and Hand Embroidered” at Studio subTela and the “Dear Data Project”.

I enjoyed the key speaker Laura Devendorf at the Symposium for Computational Fabrication 2019 (“Fabricating (Smart) Textiles – Computational Design, Craft, and Radical Possibility”). It was very inspiring to me. She uses design as a mean to critique design and does research on how technology shapes relationship to the world around us, more specifically how fabrication shapes our relationship with material. Super interesting.


Haptics Experiment


Parts & Materials


(1)Arduino Uno

(4)Keyes Vibrating motor module

Jumper wires



Circuit diagram

Simple Motor Activation


Sensory Funneling Illusion & Phi Phenomena


Sensory Saltation






One vibrating motor module was connected to Arduino Uno. I learned something basic about Arduino code by watching videos and then tried out the “Blink” and “Fade” example, running different digitalWrite and analogWrite. It was such an exciting experience to see the module started to vibrate and how the code worked!



First, I connected the modules to breadboard and Arduino Uno. Then I applied several strips of tape on the vibrating motor modules to fix them to my skin, and then wrote down their number.


The four vibrating modules were placed like a square on the back of my left hand. They vibrated at the same time and lasted for 0.2 second each time, and there was a two-second paulse between each tap. Although they were vibrating in four different positions, what I felt was the point in the center of these four modules was stumulated.


The second Illusion to be experimented is phi phenomena. I taped four vibrating motor onto my arm. The module connected to pin 13 tapped first, and then it’s 8, 2 and finally 4.  It was like the tap was originally generated from the first motor and move gradually to the last one, rather then there were four single taps.


The last one is sensory saltation, or cutaneous rabbit, which I think is the most interesting one. I used three vibrating motor modules to test this illusion, and taped them on my arm like the former experiment. Each module vibrated for 0.2 second one after another, from the no.13 to the no.2. During this process, I can feel only two stimuli, one located between no.13 and no.4, and the other located between no.4 and no.2. What’s more, they were not felt like two single stimuli; instead, it was like something moving under my skin quickly.






Textile Pressure Pad-By Jessy



Basically, the textile pressure pad is using common fabrics which is non-conductive to sense the pressure and output analogy data. The idea is referred to the method called ‘Polymerization of pyrrole’1, which is allowing conductive polymers to form in and around textiles, coating their individual fibers. Before making this prototype, I did a set of comparative experiments which demonstrate that sponge works well for sensing pressure. Being soaked in a water-soluble graphite conductive solution,  the interstices of the sponge are filled with graphite particles. It makes the sponge conductive, at the same time the deformation makes the sponge can work as Velostat to output analog data. Then a conductive copper tape is attached to the non-conductive leather material. Finally, all the components are stacked together in the shape of a sandwich to form a textile pressure sensor.



Parts & Materials list

Materials list(Figure 2.1):

Water-soluble conductive graphite pigment

Non-conductive leather cloth

Non-conductive sponge

Bubble Wrap

Double-sided tape

Parts list:

Arduino Nano 33 IOT


Full-sized breadboard

3*220Ω Resistance

Jump wires

Coper tapes

Code Link




‘PolySense: Augmenting Textiles with Electrical Functionality using In-Situ Polymerization,’ Cedric Honnet, Hannah Perner-Wilson, Marc Teyssier, Bruno Fruchard, Jürgen Steimle, Ana C. Baptista, Paul

Strohmeier,’https://dl.acm.org/doi/pdf/10.1145/3313831.3376841′Soft and stretchy fabric-based sensors for wearable robots, Lindsay Brownell, ‘https://wyss.harvard.edu/news/soft-and-stretchy-fabric-based-sensors-for-wearable-robots/’


Piggy bank sensor by Nishu

1 2 3 4 5 6 7

Arduino code:




Erin St BlaineReBoots Animated LED Boot Laces, https://learn.adafruit.com/re-boots-animated-dancing-boot-laces

Tony DiColaFestive Feather Holiday Lights, https://learn.adafruit.com/festive-feather-holiday-lights

Anne BarelaTrinket / Gemma Blinky Eyes, https://learn.adafruit.com/trinket-gemma-blinky-eyes

Rachel Fagan, Glow Pillow with Force Sensing Resistor, https://create.arduino.cc/projecthub/rachel-fagan/glow-pillow-with-force-sensing-resistor-904229


Ease The Pressure by Trish


As the pandemic has left us working from home we find the fatigue of sitting on our desks behind our screens all day. For my prototype I have designed a device a to help ease the pressure on ones elbows while they work. I used Expanded Polyethylene also known as EPE Foam because of its flexibility, compressible and shockaborbing properties as the the main part of the prototype. Sandwiched inside the EPE foam is a conductive (aluminum foil) and resistive (velostat) materials to create a pressure sensor that lights up the Adafruit Circuit Playground Express .

Parts & Materials


  1. Adafruit Circuit Playground Express
  2. USB charger
  3. Copper Tape
  4. 10K ohm Resistor
  5. Alligator to alligator clips


  1. Copper tape
  2. Aluminum Foil
  3. Expanded Polyethylene
  4. Velostat
  5. Double sided tape

img_9691img_9702img_9695 img_9704img_9703img_9707

Step 01 – Cut out EPE foam(2 pieces), foil(2 pieces) and velostat(1 pieces) in half in desired shape in this case circles as well as some strips of copper tape

img_9710img_9708img_9712 img_9714img_9715img_9716

Step 02 – Assemble the pieces together in a sandwich using double sided tape in this order EPE foam, foil and copper tape, velostat, foil and copper tape and cover with EPE foam.


Step 03– Attach the aluminum foil onto one end of the alligator clips and then the other end to the Circuit Playground Express and test the circuit.

 57fb3b96-05ec-4b69-923b-7319dce475df 04c70bc4-bee5-434a-9c7e-2fc7d44fa271

Code Hosted on GitHub


Circuit Diagram



How to Make an E-Textile Analog Sensor. (2020, May 30). [Video]. YouTube. https://www.youtube.com/watch?v=tA37mGEnPes