Questions tagged [touch-panel]

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57 views

Converting “MPR121 capacitive keyboard” sensor filter data into capacitance values?

The project that I'm working on, the MPR121 capacitive touch sensing keyboard connected with a 8051 microcontroller, my first intention when I started implementing the project was to measure the ...
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0answers
57 views

Capacitance measurement, mpr121 touch sensing keyboard

I have been assigned a project where I have to use interface an MPR121 capacitive touch sensing controller with a microcontroller. Aside from the touch detection, one of the requests for the project ...
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3answers
65 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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71 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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2answers
63 views

What touch circuit or sensor to use inside a concrete lamp?

Hi I was planning to build a capacitive touch circuit to control a concrete lamp. Will the touch work through 8mm thick concrete slab. If yes please suggest best way. Thanks in advance.
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1answer
57 views

PIC16F1827 Capacitive Touch Sensor not Incrementing Timer?

So I have a PIC16F1827 on a breadboard and was trying to get a simple demo working where I touch a wire to turn on an LED using the Capacitive Sensing Module. I was primarily going off this example I ...
2
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1answer
74 views

Is this a reasonable way to get >50 capacitive touch sensors?

I'm looking to include 50-100 capacitive-touch sensors in a project. I've found these SPI 12-key capacitive touch sensors. Would it be reasonable to use several of these for such a project, or is ...
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2answers
78 views

How to sense touch on a diffusing sheet?

I want to build a combined diffused light and touch-button around 3x3cm. LEDs could be diffused with e.g. a polycarbonate sheet or diffusing fabric, and touch could be sensed e.g. through capacitive ...
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0answers
345 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 ...
2
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1answer
421 views

How can I build a touchpad/trackpad? [closed]

Every laptop has one - a touchpad/trackpad - for controlling the mouse. I'd like to build my own, external one. I've looked around and I cannot find a tutorial. I have come across 1 example where a ...
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1answer
255 views

What material to use for a capacitive sensor?

I'm doing a DIY project that I want to use a capacitive sensor for. I'm having a little plastic box and I want to send a wireless message when someone touches the top of it. I understand all the ...
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1answer
576 views

capacitive touch buttons through VERY thick glass or macrolon? [closed]

for a science-project I need to create 4-5 capacitive touch buttons through thick glass or macrolon. I think we talk about 15cm atleast, if not 20. I wonder if a big coil or big sheet of tinfoil would ...
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1answer
368 views

2D DIY capacitive panel

I'm planning on replacing lights with smart bulbs (e.g. Yeelight RGBW) and replacing light switches with capacitive panels connected to Arduinos which will send data to RPi, which will then control ...
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1answer
51 views

Microchip MTCH6102 - 2 touch surfaces (3x3) on one chip

building a project that utilizes Microchip's gesture recognition on their MTCH6102 chip - the device has two touch surfaces (circles, diameter 20mm each, 3x3 conductive mesh outline). The ...
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0answers
169 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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67 views

Atmel Qtouch library help

I'm trying to have 3 touch sensitive buttons on an ATtiny48 device using Qtouch library. The code was generated using the library wizard inside Atmel studio. I've only added a single condition to act ...
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1answer
110 views

Large Rectangular Touch Sensor

I'm looking to make a timer for Rubik's Cube solving, which looks like this: My design just has some added features and a different output type. However, I'm not sure how best to replicate the hand ...
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1answer
430 views

The accuracy of Force Sensitive Resistors (FSRs)

I am trying to make a large scale resistive touch sensor with 4 FSRs, one for each corner of the rectangular sensor. The pressure that I'm going to be applying will be a moderately pressured finger ...
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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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1answer
303 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....
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4answers
1k views

Measure diameter of a ball with Arduino

I'm trying to design a hand-held device which would allow to measure the weight and a size of a fruit (orange/apple). For the weight I can use a load cell, but not sure how to measure the diameter. ...
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1answer
749 views

How to interface Touch module with ESP 01

I am trying to interface a touch module with the ESP WiFi module on GPIO0 pin. When I turn ON ESP it needs GPIO0 to be pulled up but if I directly connect the Touch module, its output is low at start ...
3
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1answer
79 views

touch tactile button

I am not a native English speaker so I need a little help to find the right name of the component that I am looking for. I have a device that has a touch panel with 3 touch buttons. They are ...
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0answers
125 views

How to stop capacitive buttons being triggered by acrylic sheet

So I have a bunch of capacitive buttons sitting behind a large 50x50cm acrylic sheet and whenever I place there acrylic sheet over the buttons, they start triggering all by themselves. I can't figure ...
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1answer
160 views

capacitive touch film or integerated capacitive touch panel display? using under glass [closed]

We need to put display under 2mm glass. Our device must have capacitive touch input. which method should we use? Capacitive Touch Films (place it under glass) or LCDs with integrated capacitive touch (...
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0answers
787 views

The 4-wire resistive touch is connected to the ADC's input but it doesn't give correct value

I've an STM32F103 MCU and a 4-wire resistive touch. this is the circuit I've wired up: I've written this code: ...
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1answer
885 views

Cutting Touchscreen

For a small hobby project I would like to use a resistive touch overlay. However, sourcing the correct size seems near impossible. Can I cut a resistive (4-wire) touch screen to fit?
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2answers
557 views

How is the location of a finger or more detected on a capacitive touch panel?

I think I understand the basics of capacitive touch screen, i.e. when one or more fingers touches the panel it creates a potential difference at that location drawing current. But how do you go about ...
3
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1answer
2k views

Convert capacitive touch sensing back to mechanical switches?

Capacitive sensing seems to replace often mechanical switches. Is there a way to convert them back to mechanical switches? Problem at hand is a cooking device with interfaces with the user via the ...
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1answer
633 views

Which MCU (Atmel) I can use with QTouch library?

Some MCU have QTouch support - # touch channels implemented as a hardware. Is it true that QTouch library was designed only to work with such MCUs? Can I use it with, for example, 'old' ATmega48? Is ...
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1answer
86 views

Do the test operator must hold an antena during the EMC immunity test?

We are doing EMC test the Capacitance sensing Touch panel, pursues immunity issues versus 28MHz noise. We do it in 2 methods: (1) The operator is holding an antenna(which generated 28MHz noise), and ...
2
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2answers
894 views

How could I make a water-resistant touch/tap sensor (similar to push button) for all-weather outdoor use?

I am building an Arduino-based device to be used outdoors (on a bicycle), and it is expected to work in all weather conditions. The device will have some buttons to turn lights on and off, honk the ...
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1answer
676 views

Touchable plastic surface

I recently bought a nice RGB Led Controller with a very nice design and i want to know what technology is used for recognising the touches on this thick plastic layer. It works absolutely reliable and ...
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3answers
697 views

How do I detect human touch on a point on the PCB?

I want to print buttons in the silk screen of one side of the PCB. And, I want to detect if a human finger touches any of these areas. What kind of sensor should I use? Can I do this without using a ...
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1answer
318 views

Help Identifying Touch Controller Chip

My oven started displaying an error code E11 that indicates a "shorted key". These chips are on the back of the oven touch panel. They don't seem to be the Atmel chips. The marking on the SOT23-6 ...
0
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1answer
202 views

Fastest resistive touch panel response time?

1/ What is the fastest response time of touch panel? 2/ It seems resistive panel can get under 10ms, but I want a faster panel, is there any one with under 1ms or microsecond response time? 3/ Why ...
0
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1answer
192 views

Touch screen type [closed]

I know there are many different types of touch screen out there. In the attached picture, could someone tell me what type of touch screen that is? I am looking to buy some screens like this one for a ...
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2answers
2k views

Touch activated switch

I am trying to create a circuit that will be able to detect a touch (with fingertip) on a metal/aluminium surface that it is connected to. Currently I have this circuit (I am sorry for bad drawing...):...
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2answers
187 views

Resistive Touchscreen Stands in Midway of the ADC in standby

In a resistive touchscreen I am trying to read x-y position. The schematics is as followed. The code works fine and when I press a point, it reads correct position well but the problem is in standby ( ...
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2answers
3k views

Salvaged touch pad from old laptop projects

I salvaged this touchpad from an old laptop and I would like some ideas for using it, I thought about using it as a light dimmer for two sets of lights. Does anyone know how it works? I'm sort of a ...
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1answer
168 views

Thermoplastic-based touch panels: why not?

(I'm new to EE.SE, so I don't know if this is on-topic here. Please forgive me.) From what I understand, capacitive touch technology relies on coating one side of a resistive material with a ...
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2answers
2k views

How does the Microsoft Surface table detect objects?

I saw that the Surface table (now called PixelSense) detect objects. The strange thing is that it's basically an IR screen with LCD on bottom. How does it "scan" them then? Here's a video http://www....
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1answer
212 views

Explanation of touchpoint density in touchscreens

I'm looking at touchscreen supplier specs such as this one. What does the specification "touchpoint density" expressed as touches/sq.cm sq.in or mean? The value given is "> 100,000 touches/in^2". ...
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1answer
126 views

What is the anatomy of a noname touch panel? [closed]

I would like to add touch support to my 17 inch monitor (the computer runs Ubuntu). A quick DuckDuckGo shows some interesting results: http://cgi.ebay.com/17-inch-USB-Panel-Kit-Set-Add-Touch-Screen-...
1
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1answer
210 views

touch film replacing keyboard

I am evaluating whether it can use "resistive touch film" in project-based cards using USBizi Chipset-100 in place of a conventional keyboard. I would like to see some similar design to see howto make ...
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3answers
397 views

Source for small Touch-Panels? [closed]

Is there a company that will sell me a touch panel similar to the IPhone or IPad surface, in single quantities, complete with a Developer Kit? Can I get it in a specific form-factor (say, 2x7 inches)?...