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A LED is just a pint of light. Reflecting this light is making it more magical.  If the reflecting surface is not straight but curved or even moves, the effects are even becoming “alive”. So fabric or skin is ideal.

In this swatch we make a folding of fabric and make a sequence of LED’s shine inside this folding. The pattern will become dynamic with a micro-controller. The electronics is at the back side of the fabric, the LED’s are sticking through the fabric and are visible at the front side the folding.

This swatch could become a test for reflexion if different fabrics are used in the folding.


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All the pins of the ATtiny85 are used, which means we use 5 LED’s. If you want to use more LED’s you could use Charlie Plexing.

Electronic Components:

5 LED – bright
3V battery – battery holder

some electrical wires, as thin as possible.

Programming the ATtiny85

using a Tiny USB Programmer (or other ways to program the chip).


for a sequence from left to right and back:

This is really a simple script switching on the first LED, the second and so on. Then after the fifth, return to the fourth and so on. A sensor like an LDR could be added to the chip to make the swatch more interactive.


The folding used in this swatch is made by sewing folds into a fabric and sewing the upper side of the folds to one side and the bottom side of the folds to the other side, so the fabric folds are bent.

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iron the folds of 1 cm – 1 cm – 1 cm, over the length of the fabric. Take 3 times the desired length of the final folding.

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Then sew the ends of the folding to the left and the right, to obtain the curvature. Depending of the stiffness of the fabric this gives different results. The LED’s are hidden inside the folds, their legs sticking through the fabric.

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Used in a courses “Folding” and “Smart Textiles”, wdka.nl

Foldings can become much more elaborate.

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