Questions tagged [touchscreen]

A display that incorporates a human interface device which records positional information of points of contact between the user and the display

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20
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5answers
25k views

How can a capacitive touch screen be triggered without human contact?

I want to robotically touch an iPhone screen without any human intervention. I've done some experiments but have not found a reliable solution. It seems even styluses that work through gloves still ...
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5answers
52k views

How to use a capacitive touch screen without a human hand

I'm a programmer, and I usually hang out over on stack overflow, but I have a electricity question. I'm trying to interact with an APP on my phone by indirectly touching the the screen. Modern ...
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1answer
554 views

Are electric linear solenoids the best option to push a capacitive screen button on a smartphone? [closed]

I'm trying to figure out if electric linear solenoids are the best option to activate an interface element on the touch screen of my smart phone. I have also heard of linear actuators and pneumatics ...
11
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1answer
4k views

How can electromagnetic interference from a USB charger cause a capacitive touchscreen to malfunction?

Electromagnetic interference from a USB charger can cause a touchscreen on a mobile device to malfunction, with symptoms such as reduced sensitivity or spurious touches. As an example, see http://...
7
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3answers
2k views

Is a human (or other) electrical signal absolutely necessary to activate a capacitive touchscreen?

I know this is the general wisdom, and that someone has asked a similar question here: How can a capacitive touch screen be triggered without human contact? However, I didn't quite understand the ...
6
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4answers
6k views

Conducting plastic for capacitive touchscreens

As I am disabled I have to use a headstick (see picture below) to do stuff on the computer. I also have a phone with a resistive touchscreen, which works well with my headstick. But here is the ...
4
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4answers
3k views

How do I make a micro-controller act as a finger on a touch screen?

I want to make a device that I can place on a capacitive touch screen and it will start tapping the screen repeatedly. Is there any way to do this with the Arduino?
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2answers
1k views

What exactly does a capacitive touch screen need to register input, and how can that signal be produced?

There are active styli out there, and they take 3A or 4A batteries and don't require any wireless connection. How do those emulate human touch? EDIT: I am specifically interested in iPad touch ...
0
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1answer
162 views

Digital control over capacitive touch

I would like to generate computer controlled touches on a capacitive touch screen (e.g. iphone) using the following setup: I have a conductive patch (size of finger) that I place on the touchscreen ...
0
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1answer
70 views

LCD Gasket Causes Touchscreen Issues

Edit: Pretty much all conjectures in my question have been proved to be incorrect. I started fresh with a new approach. New question is here. Original question: I'm having an issue with a ...
44
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6answers
22k views

Is there a technical reason why most touch screens use glass rather than plastic?

Most modern touch screens in portable devices are made of glass. This glass often breaks if accidentally dropped. Also, it is very reflective, making it difficult to use in strong light. I know that ...
6
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1answer
744 views

Capacitive touchscreen [duplicate]

I am doing project in which I want to perform read and write operation by using a capacitive touchscreen. What I know is I can trigger capacitive touch screen by: By using electromagnet as I heard ...
8
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1answer
1k views

Mimic human capacitance

In a video at Kickstarter a project called Tapcaps is mimicing human capacitance for triggering touches to a capacitive touch screen (the iPhone). At 0:45 in the video we can see a glimpse of the ...
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3answers
9k views

Is it possible to make a plastic touch screen as sensitive and accurate as a glass one?

I learned in this answer that touch screens with a glass front are generally more sensitive and accurate than those with plastic fronts. This corresponds with my personal experience. However, is ...
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0answers
44 views

Accuracy issues with capacitive touch screen [duplicate]

Previous question I asked here. Posting a new question because my previous approach included many incorrect assumptions. I'm working on a product with a motor, a fan, and a LCD with capacitive ...
2
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3answers
275 views

Why does the human skin steal field lines when it's very non-conductive in dry state?

In projected capacitative touch screens, sensors measure change in electric field coupling from the drive electrode to sense/receive electrode. But don't field lines only terminate on conductive ...
1
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0answers
67 views

Interfacing touch sensor with stm32f7

I'm having that touch sensor ST IC ST1633i. It's integrated into an LCD. I'm trying to interface with it, but don't know or understand the actual protocol. Here is the protocol So I'm trying to ...
1
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1answer
861 views

What is the minimal capacitor (capitor type/size/capacity) needed to fool a capacitive touch screen? [duplicate]

Say I want to provide a device (completely batteryless of course, and detached from any human touch) the capability to immitate a touch on a capacitive screen (Galaxy S6 here). I know I just need some ...
1
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1answer
295 views

Interfacing a four wire resistive touch screen with STM32F429DISCOVERY

I'm trying to interface a 4-wire resistive touchscreen to a STM32F429 Discovery board but I can't figure out how it works. I want the MCU to detect a touch so I configured the 4 pins like this: ...
0
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1answer
47 views

How exactly is the location of contact determined on an analog resistive touchscreen?

I am doing a physics project for my high school course. My project is to explain how a resistive touchscreen works.I have no engineering knowledge. From a description I found on computerworld.com (it'...
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2answers
344 views

How and What do pullup resistors do?

I am a high school student, with a basic understanding of physics.I am trying to learn how a resistive touchscreen works. I found this link from Texas Instrument to be the best source. But the ...