In this tutorial we are going to make a simple touch sensitive circuit using some Bare Paint, a 555 timer circuit, a couple of resistors, a LED and a capacitor. The 555 timer is a fun and versatile integrated circuit (IC) that can be used in several distinct ways. There are loads of interactive circuits that can be made with this chip, we'll be adding tutorials illustrating more of these projects in the future. Today we are  using the 555 with its internal flip-flop to sense the change in voltage at two input in the circuit.

When you touch the Bare Paint on either side of the gap you connect the circuit through your skin – don't worry, the current is so low you will not be able notice it. The 555 timer senses voltage change at pin 6 and pin 2, depending on which button you press and flips the output state at pin 3 - turning the LED ON or OFF. By the end of this tutorial you will have painted two touch buttons, with Bare Paint or a Bare Pen, that connect to a touch sensitive ON/OFF 555 timer circuit. Once you have got this simple circuit going you are free to get even more creative in using the paint to make different graphical touch buttons. Please send your electro-art works to us to put up on the community site!

Step 1: Components

For links to purchase these components visit our tutorials page at: http://www.bareconductive.com/555-touch-circuit

Bare Paint
LM555 Integrated Circuit
Bread Board
Jumper Wires
Paper Clip Wires
9V Battery
Battery Clip

<p>Hi, the pdf schematic is different from your circuit and your last schematic.</p>
<p>Hi IkraamG,</p><p>Could you let me know exactly how it's different so I can confirm??</p>
<p>if you dont mine sir i need a VIDEO of this circuit</p>
<p>i did this experiment but were i did mistake i'm nt getting i tried dis circuit fo 3tyms led continuously glowing..n i have to submit this case study in another 1:30 min </p>
I think this idea is amazing! Thank you for sharing this project. <br>I just wanted to know, is there a substitute for Bare paint? Thanks.
<p>Hi there, you can use something else conductive. We like using our paint as you can create your own graphics on paper. Thanks! </p>
<p>Is there is any video how to connect components in breadboard??</p>
<p>I'm afraid not on our site!</p>
Thanks for sharing
Hi, <br> <br>One suggestion: <br> <br>A circuit diagram as well as the &quot;breadboard schematic&quot; would be most helpful for those of us who'd like to hard wire the circuit without doing a breadboard layout first. Sorry if it's in the 'ible somewhere but I couldn't find it. <br> <br>Thanks for sharing this - I have many ideas for it already :-)
Hi PeterBr, <br> <br>The circuit diagram should be on the same page as the breadboard schematic on Step 6. Let me know if you have trouble finding it. <br> <br>Glad you enjoyed the tutorial! <br>
can you solder to this stuff? It would be cool to try to laser cut a pcb stencil, drill it, and then solder components to it.
Hi Amandaghassaei, <br> <br>You can't solder to it, but you can use the paint itself as a cold solder or glue to attach the components so there's no need to!
alright, here it is: <br />https://www.instructables.com/id/Flexible-Circuits/
ok, then maybe you could glue a backer over it or put some tape on top to keep everything in place. We still have some of this in the office, I think I'll try it sometime!
You don't need conductive paint. Just use wires.
sir, can I use carbon ink instead bare paint....................!
Hey, just wanted to say--Nice article! I saw the 9 volt &quot;flashlight&quot; battery used. Is there a minimum or maximum for the power source to be used with a bare paint switch. Do you shock the person? Would it be necessary to make like a little solenoid with human/bare paint and then make that thing jump and trip a bigger switch for bigger power?
Hi Mutha29, <br> <br>The 555 works with a voltage between 3 - 15 volts DC. It will work well with 6 volts (4 AA battery pack). It can still work with lower voltages, but you will sacrifice on LED brightness. I have successfully used a 3.7V lithium Ion battery with the circuit, but find 6 to 9 volts gets the LED to a nice glow. At less than 3 volts supply the 555 will no longer work properly. <br> <br>There is no need to worry about getting a shock with this circuit - the current going through the touch points is incredibly low (due to the 3M ohm resistor) that you won't even register it. <br> <br>You can use the paint to trigger higher currents using an Arduino and a relay - see Matt's tutorial, link below - which switches a mains light on and off. Always be careful when working with high voltages and currents. <br> <br>http://www.bareconductive.com/bare-paint-lightswitch <br> <br>Good luck!
Schematic needed here!
Hi Emerson John, <br> <br>We have just added a circuit diagram to the steps. <br> <br>Thanks for the suggestion! <br> <br>
nice.... <br>
In some research we did a number of years ago, we found that there is sufficient carbon in either laser toner or black inkjet ink to accomplish pretty much the same thing...
Graphite from a hard pencil is usable in some circumstances too

About This Instructable




Bio: Bare Conductive makes creative electronic tools for any designer, engineer or aspiring maker.
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