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Dose anyone know.if the problem it rf or em interference if its em would it be possible to use a powerful magnet to block the interference?(i probably don't know what I'm talking about)
Registered Member #3806
Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
Steve Conner wrote ...
I assume the problem is that the camera is controlled by the touchscreen. ...
That's is. The phone just acts as if you were typing randomly and quite fast everywhere on the screen. I can understand capacitive touchscreen is sensitive to e-fields.
I've had good luck from a very basic faraday cage made of aluminium foil wrapped around my phone and hand with a hole for the camera lens and a hole for me to see the center of the screen (for alignment).
TC frequencies are typically very very large wavelengths so you don't need to cover every square cm to keep most of the interference out.
It could also be my iPhone3GS isn't that sensitive to interference.
Registered Member #3900
Joined: Thu May 19 2011, 08:28PM
Location:
Posts: 600
PhilGood wrote ...
Steve Conner wrote ...
No, you need to put a shield over the touchscreen and then you can't work the phone. Catch-22
Lmao !
Whe need to find some conductive but transparent and flexible material. What about these antistatic plastic bags used for sensitive components ?
Catch-22... 2? A capacitive touch screen sensed the em field of your finger it's not pressure sensing or resistive, so any kind of em shielding in between you and the screen doesn't allow you to use the screen. No matter how clear or flexible.
I think that the only solution would be a box big enough for both the phone and your hand to be able to Manuver inside, with a small hole or duct for your hand to enter. The box itself would have to be glass or acrylic(or any other clear rigid substance) with metal screening of the right sized holes to filter out the noise.
Registered Member #3806
Joined: Sat Apr 02 2011, 09:20PM
Location: France
Posts: 259
ben123324 wrote ...
PhilGood wrote ...
...Whe need to find some conductive but transparent and flexible material. What about these antistatic plastic bags used for sensitive components ?
Catch-22... 2? A capacitive touch screen sensed the em field of your finger it's not pressure sensing or resistive, so any kind of em shielding in between you and the screen doesn't allow you to use the screen. No matter how clear or flexible...
Well it works, probly because when you push the conductive film towards the screen, it changes the capacitance of that screen area.
Unfortunately I couldn't check if it effectively protects the phone from e-fields, my only TC was not ready to run, I'll try that later.
Now if it works, for a reliable operation, it requires that the antistatic film is tight close to the screen but without touching it, ~2mm seems fine, could be done with a sipmle plastic frame having the size of the screen.
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How do you protect your sensitive equipment from tc interference?
