I am trying to figure out how to make a circuit that works much like a stylus for capacitive touch screens such as on an iPhone.

Given it's going to be a simple experiment, I was thinking of using an Arduino as the controller.

I have watched several videos and articles regarding "Aurdino Triggering Touch Screen", but none of them work reliably.

A stylus on the other hand can trigger the screen reliably and from a distance.

EDIT: A Samsung stylus triggers a on-screen pointer from at least 2 cm distance, while the tip of the stylus is a button notifying the phone to do some action, such as painting.

So what I need for my final project is to put electronics inside of a small plastic box (1.5cm^3) and the cube need to be able to trigger a spot beneath itself on the screen at regular intervals.

Is this possible?


To clarify this is exactly what I am looking for:

Circuitry that is placed in a 1.5 cubic centimeter box that triggers a 5 millimeter diameter circle on the screen under the box causing a virtual finger-press.

Distance between screen and actual circuitry is aprox 1mm.

  • \$\begingroup\$ Some info... \$\endgroup\$ – JRE Oct 25 '16 at 12:13
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    \$\begingroup\$ The question linked by @JRE is much more clearly formulated. Yours is rather unclear, I must say. For example: "A stylus can trigger the screen from a distance." What distance? From what I know, the stylus must touch the screen to trigger it. "my final project is to put electronics inside of a small plastic box" Shoudn't you design the electronics first? "I was thinking of using an Arduino as the controller" Do you plan to fit the arduino in 1.5cm3? ... \$\endgroup\$ – dim Oct 25 '16 at 12:21
  • \$\begingroup\$ @dim: The question is no marvel of clarity, but I read it as Vaid wanting to trigger a touch screen using an Arduino output. \$\endgroup\$ – JRE Oct 25 '16 at 12:31
  • \$\begingroup\$ @dim I added some additional info about what a Samsung stylus can achieve. Yes, I should design the electronics first, which is why I'm coming here for help first before I shrink everything down to a smaller circuit. No, the Arduino is for the prototyping phase, later I'll use a smaller mcu, or no mcu at all if possible. \$\endgroup\$ – vaid Oct 25 '16 at 13:55
  • \$\begingroup\$ @JRE yes, that's basically what I want to do. \$\endgroup\$ – vaid Oct 25 '16 at 13:56

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