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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68 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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74 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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73 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
193 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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2answers
90 views

Fiber Optics as a video source and a switch?

Is it possible to put a fiber optic bundle together and play video thru the colors of the tips (if they were all flush next to each other Is it possible to touch the end of fiber optics with hand or ...
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1answer
145 views

A small compatible gpu [closed]

I would like to know what is the best possible way to solve the following problem: I want to have a touch screen over USB this touch screen should be able to receive Graphics from the attached PC, so ...
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1answer
139 views

Are capacitive display(s) capable of measuring what fraction of a finger is touched?

I'm really curious to get an answer for this question. Since I don't know the functioning of a capacitive display and Google didn't help me on this issue, I landed here. :) Are capacitive displays ...
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1answer
945 views

QTouch Matrix ATmega8 issues

After trying a lot on QTouch Matrix for ATmega8,It didn't work for me. So sharing the trouble here. I have taken reference from this beautiful article. Here he had provided a schematic and PCB ...
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1answer
103 views

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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1answer
109 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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1answer
372 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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1answer
163 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 ...
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1answer
171 views

Capacitive projectile triggering touch screen

I've read through a number of questions (How can a capacitive touch screen be triggered without human contact?), (How to use a capacitive touch screen without a human hand), (What is the minimal ...
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1answer
606 views

touch screen foil behind 5mm thick glass

I wish to make a small project that will enable me to control my tablet\ipad behind my shower glass door. I want to be able to put the tablet behind the glass and control it from the other side of the ...
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1answer
64 views

Looking for elliptical display or modular display to approximate ellipse [closed]

I'm not very fluent in electrical engineering so please bear with my imagination. Requirements: Photo realistic display, touch screen, approx 7x3 feet (2.1 m x 0.9 m). Option 1: Do elliptical ...
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2answers
349 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 ...
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1answer
53 views

Why is the conducting layer in resistive touchscreen placed perpendicularly?

I just learned that in analog resistive touchscreen, conducting layers (usually made of indium tin oxide) is placed perpendicular to each other. One on the top flexible film, and one on the bottom, ...
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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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1answer
2k views

Have Cell Phone Display Panel(s) been hacked to accept HDMI?

Cell Phone Displays are cheap and have high-resolution and touch sense, but use varied specialized inputs via ribbon cable. So, has the DIY community made any controllers to input HDMI? What about the ...
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2k views

capacitive switch behind a mirror (silver backing)

I am new to this field, and I would like to DIY a mirror with a hidden capacitive \inductive touch sensor behind it, once touched it will turn on a 12V LED light. I have bought a capacitive switch ...
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1answer
136 views

Reasons of delayed damage signs to AMOLED touchscreen

I had the misfortune of dropping my cellphone (couple of feet). It was working perfectly right away but throughout the day the screen started displaying a darker spot in one corner that overtime ...
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1answer
274 views

Difference between line scan sensor and line scan camera? [closed]

I'm looking to build a multitouch table using line sensor/camera technology. I was hoping someone had already tried such a thing and could recommend the best suited between line scan sensor or line ...
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1answer
507 views

Characterizing a capacitive touchscreen

Is it possible to measure a meaningful impulse response of a capacitive touchscreen such as the one you might find on a mobile device, with the goal of "calibrating" devices with different ...
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2answers
556 views

Placing a button on a touch screen?

First off, I know nothing about electrical engineering. So please bare with me. I'm designing a faceplate for a moto360 smart watch that has a small area that overlays the bottom edge of the screen. ...
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2answers
83 views

Phone touchscreen malfunction when connecting audio circuit to it's jack

I use this circuit to convert audio signal to infrared signal and control my DSLR camera. It works fine on my laptop jack, but when I plug it to my smartphone jack, it shows some malfunctions in ...
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210 views

How does this USB capacitive touch light circuit work? You can touch anywhere and it turns on, not just the electrode

Here are some pics of the circuit board. Now I'm not asking how the circuit works, I understand that. There is a capacitive touch sensor IC where the shiny electrode you see on top connects to the ...
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1answer
585 views

Help identifying a voltage regulator

I'm trying to build a portable screen so that I can watch movies around my apartment if I need to move away from my TV screen (think a WiiU gamepad or a tablet). I have many raw components and I think ...
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141 views

Likely to use more power - phone screen or bluetooth le?

Just as a theoretical guesstimate, would a phone screen likely to be more of a battery drain than a bluetooth le connection? Of course this is going to vary on the amount of data being sent the ...
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1answer
1k views

Control a 3.6V motor (forward/idle/reverse) using two phototransistors facing a smartphone screen

My purpose is to build a cheap quick-and-dirty "robot" using 2 electrical screwdrivers connected to the wheels and a smartphone to control them. I want to control each motor (forward/idle/reverse) ...
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2answers
8k views

Repair a ripped touchscreen cable [closed]

I have an Ampire AM800480STMQWT00 touchscreen display. In the course of testing the device, the cable for the touchscreen proper got ripped by accident. Is it possible at all to repair the cable ...
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1answer
1k views

Can a replacement iPad screen be used on a BeagleBoard?

I have been trying to find a good touchscreen with multitouch support for the BeagleBoard. I have not had much success, but have noticed that iPad replacement screens are available fairly ...
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32 views

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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24 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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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 ...
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1answer
222 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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22 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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55 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
65 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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161 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
26 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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84 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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1answer
65 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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1answer
37 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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71 views

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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206 views

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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174 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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46 views

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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332 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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375 views

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 ...
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53 views

Rugged Capacitive Single Touch Screen

I am looking to make a capacitive single touch screen into a small table. Which I can use to put coffee cup etc on. It does not have to be waterproof but rugged enough to not scratch over time easily ...