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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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30 views

Which microcontroller for homekit alarm system [on hold]

I have idea to build own PCB for alarm system which should handle following things: GSM (probably via SIM900 or Ai Thinker A6/A7) RFID (most likely external PCB) Keypad (via touch display) Homekit ...
0
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0answers
21 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 ...
0
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0answers
33 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
37 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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0answers
47 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 ...
2
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1answer
115 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 ...
0
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0answers
19 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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2answers
104 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, ...
1
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3answers
64 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 ...
0
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0answers
67 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 ...
0
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1answer
58 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 ...
1
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1answer
39 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 ...
1
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2answers
76 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 ...
0
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1answer
33 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 ...
0
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3answers
70 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 ...
0
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1answer
291 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 ...
0
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0answers
68 views

Driving animation on an LCD using microcontroller

I was running into issues with SPI bandwidth limits with a specific microcontroller I have been asked to use. It was limited to 6MHz SPI frequency which was limiting me to a 128 by 128 display with 16 ...
0
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1answer
80 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 ...
2
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1answer
95 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 ...
1
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0answers
327 views

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 ...
0
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0answers
69 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. ...
2
votes
1answer
141 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 ...
0
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0answers
173 views

Triggering touchscreen with only conductive rubber

So I'm making something and the idea is that conductive rubber (10x9x1.5mm) touches the touchscreen and then moves away from it. When touch happens, the touchscreen should detect it. Ofcourse the ...
2
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1answer
319 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 ...
1
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1answer
244 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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0answers
157 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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1answer
97 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 ...
3
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3answers
758 views

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 ...
2
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1answer
76 views

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 ...
0
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1answer
164 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 ...
0
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1answer
300 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 ...
0
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0answers
121 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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0answers
43 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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0answers
284 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 ...
0
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0answers
311 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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1answer
288 views

24 bit rgb display training/resources [closed]

How do I write code for a 24-bit RGB TFT LCD display (if possible, also for touch-screen use)? I'm using a PIC18F microcontroller to interface with the LCD driver/controller. The microcontroller isn't ...
2
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1answer
295 views

Capacitor acting as a resistor

I am trying to make a capacitor out of a CNT ink as a touch pad. I dye two strips of fabric which each have an end resistance of ~0.5-1kohm. I have tried various dielectrics and separation distances....
3
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1answer
618 views

Capacitive touch screen sensitivity question

I have a question about capacitive touch sensing. I have read a few related questions already (here, here and here) and I think I understand the basics. From my understanding, when a human uses a ...
0
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0answers
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 ...
0
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1answer
52 views

Is it feasible to have a Touchscreen with 2 (mirrored) USB outputs?

Background: I'm investigating an AV project that requires large touchscreen panels driven by a media PC. The design calls for a redundant PC that can be switched to in the event of the primary failing....
0
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1answer
127 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
150 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 ...
0
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1answer
502 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 ...
0
votes
1answer
414 views

ESD protection Touch screen

We have an off the shelf display and touch screen (Projected Capacitive). It has passed a contact test at 4kV but failed at 6kV. Are there an measures that we can take to potentially improve the ESD ...
0
votes
1answer
255 views

How to use this touch screen button in a circuit?

I have a VCC CTH series touch screen push button, model CTHS15CIC05ONOFF, which I'm trying to use in a circuit to no avail. As far as I can tell from the datasheet, this is how to wire it: The LED ...
3
votes
3answers
295 views

Can an electric heat mat cause fake touches on a capacitive screen?

After installing one of these heated desk mats on my cold work desk, I've noticed some erratic behavior on touchscreen devices I develop software for when they're laid down on the mat. Most noticeable ...
0
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1answer
62 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 ...
2
votes
2answers
241 views

How does the glass screen of smart phones not block the discharge of capacitors in capacitive touch screens?

Glass is one of the best insulators when designing high voltage electronics, and correct me if I'm wrong, but capacitive touch screens work by measuring the charge of capacitors in a grid on the ...
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2answers
3k views

HDMI to LVDS converter [closed]

I am a software developer and now working on a touch screen based project of which I have no or little knowledge. Attached is the schematic of the circuit we obtained from chalkboard electronics. It ...
0
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0answers
157 views

Capacitive Touch Screen Stylus circuit type of thing

I am trying to figure out how to make a circuit that works much like a stylus for capacitive touch screens such as on an iPhone. Given it's going to be a simple experiment, I was thinking of using an ...