Introduction: Fool Your "Smart" Phone

Picture of Fool Your "Smart" Phone

This is a simple project to learn about and play with "Capacitive Touch". Modern touchscreens use this technology to detect your finger by detecting electromagnetic fields. More precisely your body's electromagnetic pulses.

By simulating these pulses using a controller and using carbon fiber to simulate a finger we are able to "trick" capacititve touchscreens and can automate processes such as taking photos.

For this tutorial you will require:

- A microcontroller (I used a MediaTek LinkIt)

- Two long jumper wires

- A touchscreen stylus (Lean how to build you own HERE:

A huge thank you to Instructables, AutoDesk, MediaTek, and Penolopy Bulnick for sending me the Link It One used in this instructable.

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Step 1: Wiring

Picture of Wiring

The wiring for this project is extremely simple. Run a wire from digital pin 13 (aka the LED Driver Pin) to the stylus, and the second wire from the stylus to the digital ground pin. You are now ready to start testing it out.

Step 2: Testing

Picture of Testing

To use this project simply supply a digital signal to the output pin when you want the stylus to be able to activate the touch screen.

NOTE: Make sure not to touch the carbon fiber when you are using the stylus otherwise it will conduct your own electrical signals to the screen.

I used the Arduino IDE example code "Blink" to take a series of photos. You can also repeatedly type the same letter or send a multitude of blank texts.

Make sure to post any questions or completed projects in the comments.

Have a great day! :-)


tisaconundrum (author)2015-12-16

Some of your photos came out black...

Good afternoon Tisaconundrum,

Which photos are black? They all look fine on my end. (Maybe PM me a screen shot of what you are seeing)

Thank you for letting me know and have a great day! :-)

mylpfam (author)Just4Fun Media2015-12-16

I can view the pictures (not black) on both my computer and iPad.

About This Instructable



Bio: I am an inventive photographer, Pilot, and MacGyver. I love building and modifying things to aid in my adventures. Check out my Website! Have a ... More »
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