Draw a Touch Sensor!

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Posted in TechnologyElectronics

Introduction: Draw a Touch Sensor!

About: Inventor of Conductak, an electrically conductive sticky tack!

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

Step 1: Draw the Circuit Path

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.

Step 2: Conductak for the Batteries

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!

Step 3: Conductak for the Components

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

Step 4: Play!

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!

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    11 Comments

    Hello, thanks for this instructable. Do you reckon it could work with transparent conductive coating, so a whole object could be the 'button' without disrupting its aesthetics?

    Pencil lines are kinda resistive, but yeah you might be able to get away with it for this circuit!

    The sneaky things u could do with this concept...

    In this Instructable I used an AgIC Circuit Marker, which is something like $14. It's cheaper than a Circuit Scribe, but it only works on photopaper.

    I've seen similar items you can make in your home with everyday baking goods. However, this is truly unique in the approach of the infusion of conductive materials and varying resistances. I looked at your kickstarter with honest intrigue. Thank you for making this to fill the gap between the homespun and conductive ink/paint.

    1 reply

    Thank you for your comment! My very first prototype was actually composed of stuff from Home Depot, so there could be a homespun version of Conductak. I'm definitely considering an Instructable for that if the Kickstarter pulls through.

    I've seen similar items you can make in your home with everyday baking goods. However, this is truly unique in the approach of the infusion of conductive materials and varying resistances. I looked at your kickstarter with honest intrigue. Thank you for making this to fill the gap between the homespun and conductive ink/paint.

    Great idea! Good luck with it!