He switched over to relays, and that worked perfectly. We’re guessing that changing the wire length causes enough of a capacitance change to cause the screen to detect a touch.

The sensor forms an image and OpenCV detects the actual touch configuration. It appears you can use the raw data from the Arduino, too, but it might be a little harder.

Its designer and creator explains more : It uses an Arduino Mega board and a 3.2” TFT touch screen with a suitable shield for connecting the screen with the Arduino Board.

[youtube http://www.youtube.com/watch?v=hhTNTPNs350&rel=0&color1=0xb1b1b1&color2=0xcfcfcf&feature=player_embedded&fs=1] Not a lot to say about this little hack but it ...

Sunflower Shield adds a touch-enabled 3.5in QVGA TFT LCD to Arduino projects, and demonstrates Bridgetek’s FT813 video controller – which uses the firm’s innovative ‘EVE’ video controller which does ...