This tutorial shows how to make a Soft Circuit Touch Sensor.
When pressure is applied to the sensor an LED lights up due to the variable "touch" pressure.
level: beginner. You will need basic sewing skills, and will learn basic electronic circuit.
fabric base. new, used, or fused recycled plastic fabric from our technique on Instructables !
conductive fabric. copper taffeta from Less EMF
conductive thread. Less EMF
foam. recycled from packing materials
embroidery thread. Thread Art
3v coin cell battery. DigiKey
battery holder. Digikey
LEDs. Super Bright LEDs or Radio Shack is good for local pick up in the US
needle nose pliers
a finger to press the sensor !
Step 1: Basic Circuit pattern
and the sketch of the pattern we will make [right].
The touch sensor will be the "switch" of our circuit.
When you touch it, the LED will turn on.
Let's begin !
Step 2: DESIGN ! CUT conductive material for the sensor
Cut two conductive copper taffeta squares with tails.
The large square here will be used for the sensor.
The small square "tail" is to sew the conductive thread onto.
Step 3: CUT foam
This is the barrier of the sensor.
Cut it larger than the conductive fabric.
Cut holes out of it about the size of your finger tip.
Step 4: LAYOUT the sensor
The conductive fabric is like two pieces of bread with foam in the middle. The foam prevents the two conductive surfaces from connecting until they get pressure.
Make sure the tails never touch !
[ from left to right ]
copper with tail
foam with holes cut in it [middle]
copper with opposite tail