I connected a 5V relay to an Arduino. It then opened and closed the relay, which had on a terminal (doesn't matter which one?) a wire that went to an iPhone' screen (with tin foil at the tip). On the other terminal I had nothing. The middle terminal had a wire that went to my hand.
The relay switched from floating to ground (from my hand), but the touch was sometimes not registered, sometimes it jumped around, and when it worked at best, the touch was registered, but the "touch end" didn't work even after the relay went to floating position.
Any ideas as for why this didn't work? I feel that either the relay is too big and disturbes the signal or the software behind the screen works in a way that doesn't allow this method to work.
Schematic: (70 ohms on the relay's coil)