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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Touch screen power supply problem

I am using Raspberry PI 4 Model B (4GB) with an official capacitive 7" display. I am powering the device using an external AC-DC (220VAC - 12V) power supply. I converter 12V to 5V using a buck ...
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How to implement a touch controller wake up circuit?

I have an system-on-module (SoM) connected to an LCD with touchscreen interface. The SoM allows wake up from sleep by toggling one of its GPIOs. These are the datasheets: LCD, touch controller and SoM....
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Identify Ecobee's 4/5 screens pinouts

Got myself few broken Ecobees thermostats thought to reuse some of the parts in my Arduino/STM32 projects. The question is how to identify screen pinout. I have few working Ecobees and oscilloscope ...
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How do I calculate the capacitance of a capacitive touch or water sensor?

Sensors like capacitive touch or moisture sensors are simply two traces drawn on a PCB. For example, you may check the Grove soil moisture sensor. In these types of sensors, the capacitance increases ...
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Touch pad Document

I tear down one touch pad and wonder what technology they used. I am sharing picture of it. Any one know what is used for touch sense ? (my guess is capacitive). I am planning to design one by myself. ...
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112 views

How to detect which pins on a pin display are touched using capacitive sensing

I'm working on a project to apply touch sensitivity to a modified pin display (30x30). The goal is to allow someone to interact with the display through their fingers and ideally touch. We initially ...
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Need help with configuration of a touch sensing lamp project! [closed]

I am currently a design student in university, and am attempting to configure a large scale project for my final. The idea is that there would be a lamp, with one person holding onto either (wire? ...
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Failed to trigger capacitive touchscreen of my iPhone XS

As you can see in the title, I am trying to trigger the capacitive touchscreen of my iPhone XS but it does not work as intended. Here first a picture of my Arduino setup (the cardboard represent my ...
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76 views

Will using the positive end of an AA battery to touch my phone screen damage my phone? [closed]

I'm playing a game where it will be helpful to hold down a button for an extended period of time. I didn't have a stylus, so I looked online for any ideas. Lots of people said to use the negative end ...
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22 views

How are touch interfaces developed and tested industrially?

Touch interfaces are omnipresent (mobile phones, wearables, cars, ...). I'm very interested in understanding how those touch sensors are developed, validated, and tested industrially. Is there a "...
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23 views

Test device for capacitive touch screens?

Are there any (more or less) simple test devices for capacitive touch screens, e.g. something which I can attach to a touch screen and which is able to do capacitive inputs at fixed locations (ideally,...
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65 views

How to redirect electric field lines with a copper plane

I have been testing a capacitive sensing circuit in which an electric field is projected vertically to sense a finger (a grounded conductive object). On the PCB, a tx and an rx are 2 copper structures ...
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Is the phantom touch issue present in resistive touch screens?

Do phantom touches (ghost touches) occur in resistive touch screens, or are they only present in capacitive touch screen displays?
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Reverse-engineer pinout of capacitive touchscreen

I'm interested in reusing the capacitive touchscreen of my old iPad. (As a learning experience -- I'm aware that this project will cost me more than just buying a new capacitive touchscreen would.) ...
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How to get USB-mouse output from capacitive touch panel?

I have this 7" capacitive touch panel overlay that I want to attach to my Raspberry Pi 4B. I don't know what kind of data comes out of that FPC cable, or even what its pinout is. Is there a well-...
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Capacitive touchscreens dangerous and piezoelectric [closed]

Isn't capacitive touchscreen dangerous? I mean we are using our body to be a conductor and even with small voltages a current that could kill us. Also why aren't piezoelectric touchscreens used? In ...
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Cell Phone Purse w/ Touch Screen Easy Access

Hi I want to make Cell Phone Purse w/ Touch Screen Easy Access in mass production . My question, what is the quality of plastic which used window in front of cellphone which is touch screen . Thanks
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Small touch screen that works under frosted glass or plastic [closed]

I’m trying to build a device with an rpi 3b+ with a touch screen that looks something like the nest thermostat e. Is it possible to have a touchscreen behind frosted glass or can anyone let me know ...
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1answer
103 views

A hole in middle of a capacitive touch screen

I'm thinking about using a capacitive touch screen (the touch layer only, no display) to detect the position of two moving parts. Each part would have its 'stylus' just above the screen to mark the ...
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Is there definitive documentation regarding the reliability of a capacitive touchscreen?

I'm working with a manufacturer who wants to use a touchscreen (like a mobile phone) to activate the machinery but is afraid the touchscreen could give a false reading. This would be a touch-and-hold ...
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174 views

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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28 views

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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415 views

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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159 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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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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78 views

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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88 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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138 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 ...
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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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451 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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608 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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179 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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1answer
593 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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23 views

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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75 views

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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1answer
223 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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1answer
565 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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1answer
949 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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31 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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259 views

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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223 views

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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183 views

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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74 views

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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55 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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2answers
229 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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54 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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3answers
112 views

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 ...