I'd be surprised if even 5V was enough to damage a resistive touch screen. At 300 Ohms that would be about 16 mA of current or 0.08 Watts. Make sure your code disconnects Y when powering X and disconnects X when powering Y.
I'd be surprised if even 5V was enough to damage a resistive touch screen. At 300 Ohms that would be about 16 mA of current or 0.08 Watts. Make sure your code disconnects Y when powering X and disconnects X when powering Y.