/k/ - Weapons

>>550477

No idea, but very unlikely.

If that was possible, just think of all the public areas that suddenly would limt the usage of phones…

Or at least schools.

>>550477

If it was possible why would teenagers allow anyone to have a working touchscreen?

Resistive touchscreens have trouble with cold/hot temperarures, because the material either becomes too hard/too soft to work properly. You also have greater trouble with wear and tear. On top of that comes the lower input resolution.

>>550539

That's mostly lies they tell to cover up the simple fact that they're more expensive but produce better results. We use them in HMIs in industrial applications in temperatures far hotter/colder than what a cell phone gets exposed to, and the resistive screens work just fine.

>>550477

Capacitive touch screens work because they measure the capacitance of an area via an oscillator. If the frequency of the oscillations change, the capacitor it's attached to has changed.

All mass has an electical effect of some type, the question is how big. Humans have lots of water in them, which makes them a good conductor. The addition of a conducting mass changes the capacitance of the touch pad. However, because the measurement is oscillating, the only way to prevent the oscillations from changing is to change the stored charge at the same rate. Therefore, you would need to oscillate the person's electric field at the exact rate of the measuring oscillator, much more difficult than a simple grounding. Furthermore, each pad oscillates at a different frequency (due to trace length and other factors), and the oscillator only measures that there is a change. Not only would you have to vary the electric field for each screen and person, but for each capacitive touch pad on the screen.

It's a good thought, denying everyone the use of their phones, but you'll have to use another method than attacking their capacitive touch interface. It's too sensitive to work for mutiple people and devices.

t. electrical engineer

>>550576

> Humans have lots of water in them, which makes them a good conductor

>oxides

>good conductors

pick one.

It's the minerals and salts that are conductive.

>>550577

And how will those ions move around? Oh that's right, in solution. Sorry I didn't want to add electrochemistry to that already long-winded explanation.

>>550576

Ah see, I was always under the impression that it had more to do with the grounding since the capacitive touch is releasing into the ground. Used to fuck around with this in our technician courses by cutting out the grounding and watching our phones (or other devices like touch lamps) virtually not respond when poking at them.