I recently bought a tft touch screen from Sainsmart:http://www.sainsmart.com/arduino-compatibles-1/lcd-module/sainsmart-3-2-tft-lcd-display-touch-panel-pcb-adapter-sd-slot-for-arduino-2560.html
I'm using it with a Sainsmart Mega clone and shield (it was all in a bundle from them). I tried testing it using Henning Karlsen's touch library:http://henningkarlsen.com/electronics/library.php?id=55
But it seems the touch screen is not that sensitive. I can see there is a setting in the code for the precision of the touch library, and a calibration one. I've calibrated it and tried various precision settings. But sometimes it seems that it just doesn't register my touches. Sometimes on the example drawing app I touch it and there is a single dot, sometimes lots of dots. On the example with buttons I sometimes had to tap it multiple times to get the buttons to register a tap.
Any idea on how to improve the sensitivity? Is this an issue with the hardware itself, or likely to be a software/library issue?