How to use a 4 wire resistive touchscreen with an Arduino

A resistive touchscreen consists of two flexible and resistive sheets with an air gap between them. Then the screen is touched, the two sheets are pressed together.
By applying a voltage over one of the sheets it is possible to calculate the position in one direction by measuring the voltage on the other sheet.
To get the position in the other direction the voltage is applied over the other sheet (the one you previously measured the position from) and measure the position from the first sheet (the one you previously apply a voltage over).
In this video it is shown how to do this with an Arduino.

[@siku5it]

Thank you for the instructions. It helped diagnosing an issue with my car-radio- It's wasn't the touchscreen that was broken.

[@Dr.SanjeevSaxena]

Interesting and intriguing... Thanks

[@jisa4gamers]

- First of all make sure you have a big Pull down resistors on the Two analog inputs. ( I used 10Kohms ) - Second, there is a mistake in his code. the delay commands should be placed before analogRead commands to give the arduino the time to switch the pinmodes. if you put the delay command before after the analogRead you will not have a 0 value with no touch and also your readings will be totally wrong. you can reduce the delay time to 10 millisecond and maybe even less and you will get a robust performance.

[@AlessioSangalli]

Pull down on analog inputs? Why?

[@linzenmeyer]

@@AlessioSangalli Yeah, I was under the impression arduino analog inputs have built-in resistors

[@SethTaylor1]

Hi there, I know your touch screen is rather small but what happens if you placed a larger object such as a palm. Are you still able to resolve a coordinate? Thinking for a larger 15" screen. Thanks

[@EunchanPark]

cool!!!!!!!!!!!!!

[@64070204]

Can i use a metalic ball on that? Will it detect it?

[@qzorn4440]

nice.

[@triphan4362]

how the voltage that the screen working ?

[@matusjankech8761]

Hey could you help me out ? I did everything like you and when i upload code for only 1 axis everything is fine but when i add 2. axis the values start to flow and i cant sattle them to 0 when i dont touch.

[@jisa4gamers]

First of all make sure you have a big Pull down resistors on the Two analog inputs. Second, there is a mistake in his code. the delay commands should be placed before analogread commands to give the arduino the time to switch the pinmodes.

[@aymankhairy888]

Hi there , could you send me the full code you used in the video , please ?

[@6ggtov72]

I'm pretty sure that's all of it...

[@NailujAgelliv]

Does anyone how to use a capacitive touch glass with an arduino? I want to buy a touch glass replacement for a smartphone and turn it into a digitizer

[@prathameshsuryavanshi6075]

i want its proteus simulation...there is no any laibrary available for resistive toach screen...

[@user-ht9en5hr7g]

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