4 wires resistive touch screen decoder

143

01:06:00

blue and green are analog signal of screen touch. The two pots are the representation of the screen. 

Who it works :
basicly the screen work like 2 voltage divider. To mesure the touch position you have to apply a voltage to one screen layer and mesure the voltage on one wire of the other layer. then you do the same thing but with voltage on the second layer and mesure on the first. 

by doing this many times per second you can track a press, a release and a drag. some screen/controller can even mesure the pressure (commonly z axis). 

published 10 years ago

add comment in editor

EveryCircuit is an easy to use, highly interactive circuit simulator and schematic capture tool. Real-time circuit simulation, interactivity, and dynamic visualization make it a must have application for professionals and academia. EveryCircuit user community has collaboratively created the largest searchable library of circuit designs. EveryCircuit app runs online in popular browsers and on mobile phones and tablets, enabling you to capture design ideas and learn electronics on the go.