The wires come from the midpoints of the screen edges.
Let's say you connect left and bottom to ground and right and top to +5V and the resistors are 500 ohm. Touching the center will give a left-right and top bottom value of 500.
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16