Finger Bend

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Introduction: Finger Bend

About: Electronics & Textiles

Finger Bend is a sensor created to find a way of making finger bends inside of a glove, control light and sound.

The idea behind this glove is to then connect it to a body suit with other eTextile sensors for Immersive Audiovisual Performances.

What inspired me to create this project was the vision of performing freely through body movements. It is our innate interface. From my view, it is the obvious tool, instead of a trackpad, mouse, tablet, controllers, joysticks…

Inspiration: KOBAKANT’s sheath bend sensor.

Finger Bend was create for the E-Textile Summercamp’s Electronic Textile Swatch Exchange

The E-Textile Summercamp‘s Swatchbook Exchange is a platform for sharing physical work samples in the field of electronic textiles. The exchange wishes to emphasize the importance of physicality and quality workmanship in an increasingly digital world.

I also posted it on my website: https://willpowerstudios.com/200910-finger-bend-sensor/

Supplies


Materials:

× Stretch Piezoresistive Conductive Fabric (https://www.lessemf.com/fabric1.html#11321)

× Copper Thread (from Karl Grimm)

× Stretchy Jersey Fabric (online or textile shops)

× non-conductive thread (online or textile shops)



Tools:

× Sewing machine

× LED

× Breadboard

× Computer with arduino and the library for the microcontroller* you are using if it is not yet installed

× USB cable

× Lighter or heat gun (for shrink tube)

Examples of Microcontrollers: Arduino Uno / Nano / Teensy / ESP32

Step 1: Materials

Step 2: How the Finger Bend Is Made:

Step 3: Let's Start

Cut the stretch jersey fabric to the length of your finger from the knuckle to the beginning of your nail and width of ~ 8 cm.

Cut a piece of stretchy piezoresistive material and top fabric, both at the same size, similar to the top left photo.

Place piezoresistive stretchy fabric in between the base and top fabrics.

Step 4: Sew 3 Lines to Slide the 2 Copper Threads in Between Them

Step 5: Cut Extremities for Closing

Step 6: Sew the ‘inside’ to Close

Step 7: Slide a Finger Through It to Feel the Size

Step 8: Slide Copper Thread Through Pathways With a Tight Knot at the Entrance Before Going Through Hole

Step 9: Make Copper Pins

× Circle pin around copper thread

× Slide it through shrink tube

× Shrink it with heat gun or lighter to tighten it around the copper circle that you made around the male pin

× Do the same with the next thread

Step 10: How to Test It:

How to test it:

Connect the copper threads pins to alligator clips, and connect those to a multimeter with the ohm measurement selected. Observe the change in ohms as your finger bends. Make sure the copper threads do not touch

Step 11: Wiring

The Longer pin of the LED goes to pin 4 of the board.

Step 12: Make the Connections

Step 13: Arduino Code

// WILLPOWER @ Swatch Exchange 2021

#define LED_BUILTIN 13

#define LED 4

int bendSensorValue;

int light;

// the setup function runs once when you press reset or power the board

void setup() {

Serial.begin(9600);

// initialize digital pin LED_BUILTIN as an output.

pinMode(LED_BUILTIN, OUTPUT);

pinMode(LED, OUTPUT);

pinMode(A0, INPUT_PULLUP);

}

void loop() {

bendSensorValue = analogRead(A0);

light = map(bendSensorValue, 740, 840, 255, 0);

light = constrain(light, 0, 255);

digitalWrite(LED_BUILTIN, light);

digitalWrite(LED, light);

Serial.println(bendSensorValue);

}

/*

All Finger Bends are a bit different in terms of the data they are generating, so you may have to calibrate yours.

To do this, after you uploaded your code to your microcontroller, open the Serial Monitor in Arduino and compare the numbers between the highest and lowest… basically when you finger is straight versus bent.

Replace these numbers in the map function from 740, 840 to your numbers.

Keep playing with them until you get the result desired.

( the code is also on github: https://github.com/WillpowerStudios/FingerBend ) */

Step 14: Play

Bend your finger and watch the light change.

You can use it for lights, visual art animations, motors, sound, and whatever else you desire to control with your finger(s).

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    6 Comments

    0
    GuillaumeDeplancke
    GuillaumeDeplancke

    1 year ago

    Nice project! I really like the illustrations. Well done!

    0
    WillpowerStudios
    WillpowerStudios

    Reply 1 year ago

    Thank you Guillaume ! I took the time to make them, so I am happy to read your comment :)

    0
    Aarav G
    Aarav G

    1 year ago

    Well documented and thought after!

    0
    StumpChunkman
    StumpChunkman

    1 year ago

    Very cool! Thanks for sharing.