Draw a Touch Sensor!

Circuit building and prototyping is getting easier and easier these days! In this Instructable, you'll see how to make a simple touch sensing circuit just by drawing it!

Materials:

Conductak (Conductive Sticky Tack)

AgIC Silver Ink Marker

1x Glossy Photo Paper

2x Coin Cell Batteries

1x NPN Transistor

1x LED

You can follow a schematic or template, keeping in mind where the batteries are going to be. I just drew freehand using an AgIC marker, but any conductive drawing tool ought to do.

I stuck a bit of Conductak onto the the circuit where the batteries were going to go. I stuck one battery to each glob, being careful with polarity, and then folded the corner of the paper over and stuck the batteries together with more Conductak. No binder clip needed!

Next, stick some Conductak onto the rest of the circuit for your electrical components. Then stick your components on. That's it!

When you touch the pattern in the middle, your skin completes a circuit. The current that passes through your skin would be too low to light an LED, so we use a transistor to amplify the current to a level that can turn the light on.

I hope you enjoyed the Instructable! If you're interested in Conductak, you can read more about it HERE! Thanks for reading!