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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71 views

How does this touchscreen communicate with the motherboard and can I make it work with Raspberry Pi? [closed]

I've recently dismantled a old HP Pavilion and I want to use the touchscreen to make a Raspberry Pi tablet. I was wondering how the touchscreen normally communicates with the motherboard (is it ...
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Why does this part of an OLED filter light only when orientated correctly?

Note: The screen is an OLED screen. I had assumed it was LCD, therefore the post mentions it as such. I was disassembling a Samsung phone (GT-I9305) and was able to seperate the LCD into two sections....
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How can I add a raspberry to a touchscreen car dvd unit? [closed]

I am working on converting a Toyota 2-din touch screen dvd stereo unit into a car computer. I would like to add a raspberry to it and be able to have the raspberry display a browser on the touch ...
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Is there a material that I could use to generate cap touch presses? [duplicate]

I want to automate some testing that uses captouch as the interface for the human user. I would love to use an Arduino or similar's GPIO to create the equivalent press and release events from a finger....
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What are these mobile pixels?

I've got this picture under my microscope for an old Samsung Galaxy Ace mobile phone, I'd like to know what are the different pixels in the rows with a separation in the subpixels? And how are they ...
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Can light damage a monitor/screen

I was reading some posts about how light can damage a camera by heating it up its internal components? Link: Can camera sensors be damaged by light? If I shine a 150-lumen flashlight at a monitor or ...
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Large NFC/RFID reader antenna around a screen

I would like to have an NFC/RFID reader with a screen around 7", where one could tap the card anywhere on the screen to have it detected/read. I do not need to know where the card was placed (...
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151 views

Dielectric break down of stacked glass layers

We have a capacitive touch panel with 1 mm thick cover glass. Currently it is failing at 15kV ESD. I am assuming that dielectric breakdown of the glass occurred and the touch driver is exposed to ...
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ungrounded conductive materials for touchscreen interaction

I am in search for materials with enough capacitance to control smartphone displays as good as the human hand. My goal is to build a gripper with the ability to control a Tablet. I would prefer using ...
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25 views

Touch sensitive surface above leds

So I'm currently working on a box which should dim my lights based on a touch surface on top of the box. To indicate the light brightness I want to place a ws2812b ledstrip under a layer of white ...
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Cap touch measurement using digital pin?

I have previously used dedicated touch pins and connected them across an electrode and been able to easily detect touch. Usually in such a case one wire directly from the pad to the dedicated touch ...
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75 views

How to run electricity through metal wire to (safely) act as a stylus?

I’m trying to make a robotic arm draw a lowercase ‘i’ on my iPhone’s drawing app without lifting the stylus. The robot arm bit is another story, my current focus is trying to make a stylus out of a ...
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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 ...
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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 ...
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210 views

How do I trigger capacitive touch screen electronically (without hands)? [duplicate]

I would like to trigger a "touch" or "touches" to a smartphone screen electronically without actually touching the screen with my finger using a remote control somehow. The idea would be that every ...
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433 views

Mutual capacitance sensor behaviour

In a typical mutual capacitance touch sensor when finger approaches sensor it draws electrical field in effect decreasing the capacitance of the sensor (which is described here and here, for example). ...
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109 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 ...
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348 views

Build In Self Test LCD

I've recently been trying to get a custom LCD (ET101005DSAK0) connected to an Embedded System on Module however without any success. When debugging why the LCD is not working I wanted to make use of ...
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Hover Stylus for capacitive touchscreen [duplicate]

Capacitive touchscreens are designed to react to the capacitance of a human body. To my understanding the touchscreen is measuring local distortions of the electric field. Is there a way to influence ...
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Is it possible to drive a capacitive touch screen work as a touch simulator? [duplicate]

I want to simulate a finger touch/move/etc. on capactive touch screen. Obviously using a robot arm and stylus pen is a solution, but it was expansive and the structure was too complex. It would be ...
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119 views

Capacitive touch screens and TPU

I'm sorry, I may be slightly out of topic. I'm just an occasionnal "handyman" and I did not found any helping ressource on the web. I'm willing to protect a touch screen and none of the usual offers ...
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338 views

STM32F0 Capacitive Touch Not Detecting

I am trying to implement a simple capacitive touch sensor using the STM32F0's TSC peripheral. I currently have the following setup. (PA1 and PA2 are switched in the schematic, accidentally) simulate ...
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593 views

Simulate capacitive touch

I am using an Arduino Uno and would like to simulate a capacitive tap with zero human contact on my iPhone 5 screen. What seems to work right now is putting a coin on the screen and connecting the ...
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27 views

How are individual mutual capacitance signal read out from a touch screen?

If I understand this correctly, on a touch screen, you have a a grid based system where the rows and columns are either driving or receiving. When you touch the screen a mutual capacitance arises ...
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Is it possible to connect a smartphone/tablet OLED screen directly as a PC monitor? [closed]

why? Why OLED? mainly because of best contrast by having no backlight annoying leakage. Why smartphone or tablet screen? because of size, resolution and price. usage requirements, previous tests, ...
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What shape do the electrodes of a touchscreen have?

I know that capacitive touchscreens need two layers of electrodes, but have not found much on the precise shape of those electrodes. Are they just plain straight ribbons, or are there more elaborate ...
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How can I make a capacitive touch panel that can sense position?

I'm trying to make a fairly large touch panel (no display). Or if that's any easier: a set of touch ribbons. The Wikipedia page on capacitive sensing and other online resources seem to pretty much ...
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Connection For simulation touch using 1ch relay

http://gameautomators.com/book/Electronics/4-simulation.html Hi here is a reference to make a touch simulation with rpi and 1ch relay I can't understand how to connect gpios with relay. There are ...
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50 views

Real world objects touching reading the same capacitance?

In my project, I am developing a capacitive sensor based system which attempts to identify if two real world objects(*) get in contact with each other. I have done my homework (some) on Capacitive ...
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163 views

Problem I2C reading RA8875 using TM4C123

I have been working with I2C protocol to create some code for the RA8875 (see for I2C from page 67) using a Tiva board (TM4C123, I2C chapter from page 997), and I was able to paint in the display or ...
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41 views

Connector identification (multipin connector for automotive touchscreen)

This connector is from a device connected to the touch screen in the car. This device is chinese, so I'm having trouble locating information about any part number or name. The connector has 4 wires ...
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How to drive a 3” TFT

I want to display 2 or 3 images in a loop (every 5 seconds or so) on a 3 inch TFT. The TFT can be found here, Resolution 240x400 Screen 3 Inch Tft Lcd with MCU Interface It uses an MCU interface, I ...
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540 views

What lvds connector do I have

Can someone help me find out what type of LVDS cable I have and point me in the direction of an adaptor to HDMI. Thanks. Backstory: I recently had to throw out an old Sony Vaio All in one PC and ...
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Checking my understanding of this datasheet of a TFT LCD display?

I'm trying to modify an HDMI decoder board by Adafruit(https://learn.adafruit.com/adafruit-tfp401-hdmi-slash-dvi-decoder-to-40-pin-ttl-display/downloads) to work with an IPS screen that has a 51 pin ...
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142 views

How does glass create an electric field?

I'm reading from Microchip's data sheet regarding their MAXTouch microchip, which details on how to create a touchscreen compatible with their chip, and in discussing the "mechanical stackup" of a ...
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Raw data acquisition from a capacitive touch screen

I'm trying to integrate an existing PCAP touch screen into an experimental project I'm working on. For it to work the way I want, I need access to the raw data from the touch-screen nodes instead of ...
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Using a straw filled with electrolyte as stylus?

Now what I understand is our human body or a stylus disturbs the electrostatic field of a capacitive screen and thus the mobile calculates the disturbance and does some math and registers a touch. ...
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238 views

How do capacitive screens work with rubber head stylus?

Now I kind off know that Capacitive Screens have like capacitors built into them that create an electrostatic field. Now whenever a thing that can carry charge or a conductor touches it distorts the ...
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636 views

Resistive touchscreen - when measuring X, why doesn't Y affect the reading?

A resistive touchscreen (4-wire) looks like this as a schematic: To read an X position, you put voltage across X+ and X- and then read the voltage between EITHER Y pin and ground. How does the Y ...
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378 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: ...
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What is x-plate-ohms on touch?

I am using tsc2007 on linux. The linux kernel has the following configuration to use tsc2007. https://www.kernel.org/doc/Documentation/devicetree/bindings/input/touchscreen/tsc2007.txt ...
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139 views

Commericaly available resistive surface

As you all know one can experiment with drawing graphite patterns on paper for forming improvised potentiometer-like-surfaces So I was wondering If there's some sort of commercially available ...
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Which color puts the least “strain” on an LCD pixel to avoid burn-in/ghosting?

I am developing a user interface on a cheap Kinco color LCD HMI unit. After leaving a test UI on the screen for about 3 days, there was a very decided "ghosting" effect. I was able to eliminate the ...
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Touch screen reacts exclusively skin and stylus, how?

I noticed that with my Android phone, the only things that it will respond to when tapped by are my skin and a stylus. It won't respond to taps by anything else. Not a toothbrush, not my hair, not a ...
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208 views

Figuring out the protocol of an SPI device without a datasheet

I am pondering about interfacing with the iPad Mini 2 touch panel. It seems that no one has successfully done this and/or published anything about it, so I want to take a stab at it. As far as I ...
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452 views

How to physically stimulate a touch screen with an external device

I need to develop a small autonomous device that could stimulate a touch screen. For the record I need such a device to be able to run some automatic tests on some specific smartphone apps, where ...
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206 views

turning TFT on/off using MOSFET

I want to be able to turn TFT screen on and off using MCU. Is it safe to put a FET on the ground line of TFT and drive it from MCU, by disconnecting and connecting ground from the screen? or should I ...
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How to design a auto-touch attachment for capacitance screen?

I’m thinking about developing an attachment which is able to “touch” the capacitance touch screen just like the human fingers do, it might be a membrane layer can be sticked to the capacitance touch ...
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365 views

Can I use a touch screen from an old Blackberry on a Raspberry PI?

I have a pile of old Blackberry phones with capacitive touch screens and I'm hoping they can be reused as, at the very least, output devices for Raspberry PIs or even microprocessors. Is this even a ...
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Interpreting touch screen data (I2C, FT5306)

Edit: sussed it, largely to help below. It turns out, screen X/Y do not have to correlate to touch sensor X/Y and, even more strangely, the touch resolution does not necessarily match screen ...