Making a Simple Soft Switch

Introduction: Making a Simple Soft Switch

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Step 1: Designing the Circuit of the Soft Switch

. The two different designs were traced on the light weight fabrics.
. Masking tapes were used as stencil.

Step 2: Applying the Conductive Paste on the Fabrics

. The conductive paste Electrosperse D-112 was used.
. 3 coats of the conductive paste were applied to make the print more conductive.

Step 3: Heat Setting the Prints

. Each coat  was applied with a small brush, dried and heat set using a hot iron.

Step 4: Front and Back Fabrics

. Sample on the left side was sewn over the second sample (on the right side).
. Each rectangular print on the first fabric represented a switch that would be connected to a single LED.

Step 5: Hand Tacking the LEDs to the Fabric

. LEDs were hand tacked over the print with conductive thread.

Step 6: Using Interfacing

. To prevent a permanent contact, an interfacing of 1-1 mm in thickness, was sandwiched between the two layers.
. The interfacing was cut as shown in the picture.

Step 7: The Final Soft Switch

.The soft switch consisted of two layers of light weight fabric which were placed on top of each other.
. The top layer and the bottom layer were connected to the positive pole and to the negative pole of the power supply respectively.

Step 8: Testing Each Button

. The rectangular prints on the sample are the switch which works by simply touching each rectangle.
. Applying a light pressure will cause the top layer to touch with the bottom layer which in turn, will complete a circuit and this is demonstrated by lighting the square LED.

Step 9: Soft Switch Ready for Implementation

. The soft switch is lightweight, can be folded, bent, rolled and these do not affect the function of the switch.
. This switch can therefore easily be integrated in garments or soft products.

Finalist in the
Soft Circuit Contest

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