Questions tagged [touch]

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Blackberry Key2 Keyboard module

Can anyone please tell me the gesture supported keypad module similar to Blackberry Key2 Keyboard?
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26 views

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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43 views

Touch switch for hanging lamp (touching metal bar): Ideas?

A few years ago, we have bought an IKEA Glimt hanging lamp that operates with halogen lamps. It has a "touch dim" functionality, so when a person touches the metal bar of the lamp, it dims (...
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Touch sensor selection

I am currently researching a touch/force sensor for my project. Purpose of this post is to get your help in sensor selection. Below is the information about the project so that you can get insight ...
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27 views

Simulate capacitive touch sensitivity and noise immunity

Due to covid, we are limited in the time we can tune our touch designs before EMC tests. The device we are using has a PC based analyzer that is connected to the device over a serial protocol. ...
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50 views

Capacitive Touch Faucet Solenoid Battery Box vs AC/DC adapter [closed]

I have a MSTJRY touch kitchen faucet purchased through Amazon. It uses a valve solenoid in line with the water supply to control the on/off of the faucet based on capacitive touch on the faucet stem. ...
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28 views

ESP32 - Touch sensitive pins and magnetic fields

For a project I plan on using an ESP32 board, to make use of the touch sensitive pins. The final "touch plates" will be near a magnet that is moving. By near, I mean about 7 cm. It is a 12mm ...
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39 views

RaspberryPi touch sensor using transistor

I built the following circuit. When I touch the rogue transistor base wire and GPIO is outputting, the LED lights up (still not quite sure why, so if someone could explain this, that'd be helpful, too....
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46 views

Capacitive touch sense problem with battery powered laptop

I designed a PCB that includes capacitive touch. The circuit works with 5V powered from USB. When Laptop is connected to 220V line, the PIC can sense capacitance variation. When Laptop is not ...
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1answer
58 views

Use Mosfet as a touch switch

I would like to use N-channel as a touch switch which will be an input to the microcontroller. Currenty I am concerning about power draw. The whole device will be in metal case and I am planing to ...
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90 views

Bypass touch switch on humidifier circuit board

i have a simple humidifier that only powers on by a touch sensitive switch. I need to bypass it because when the power is off after that the device doesnt start automatically. I tried some things but ...
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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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1answer
56 views

What is the best way to sense if a climbing hold is being used by a climber?

I am designing a climbing wall game that gets what holds are being used as inputs. I'm currently planning on using a Kinect sensor to tell where hands are relative to holds and capacitive touch ...
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48 views

Multiple ESP8266-12E's with multiple touch sensors

I'm looking for some advice, and I'm not sure I'm barking up the right tree by using ESP8266 NodeMCU CP2102 ESP-12E's. I am currently using Arduino IDE to program the 8266's. I have two 8266's that I ...
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52 views

Can a capacitative touch switch provide multiple response levels?

After recently discovering the ESP32, I've been inspired to attempt my first electronics project. It will be a very simple wifi-enabled light. I thought I would take advantage of the capacitative ...
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1answer
52 views

What is this glassy black bulge on a keytar button chip? [duplicate]

I'm disassembling a non-functioning toy keytar. This is the chip behind a couple buttons, including an on/off button. What could the black, glassy bulge component be?
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22 views

PIC ADC always returns 0 when used as a touch switch(CTMU)

I use PIC18F45K22 and XC8 compiler. I've read Chapter19 of datasheet and AN1250 to use touch switch property of CTMU. I coded according to these documents, but ADC always returns 0. I share all the ...
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51 views

Trying to identify a component in a 12 volt LED on/off touch switch

I'm wondering if anyone can help me identify what this 8 pin IC is, in a capacitive on/off touch switch I have. It is a soic or 8-VSSOP package. 64RX-Y is written on the bottom of the IC, nothing on ...
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2answers
120 views

What type of touch button is this?

There's a touch button which has a spring on the PCB. Is it capacitive? How does it work? Do I need a special circuit to read touch events?
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174 views

ESP32 touch sensor outputs unstable values

I am trying to implement touch functionality of esp32 development board to toggle a led. But on uploading a simple touch detection sketch, output have spikes i.e. usually value remains near 100 but ...
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65 views

Waterproof capacitive touch-sensor issue

my goal is to develop a waterproof capacitive touch-sensor. In many sources on the internet, it is said that a mutual-capacitance sensor can achieve this. For example, in the TI Designs: TIDM-1021 ...
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91 views

Power ON-OFF Memory Logic Circuit

There is touch sense circuit that controls a SMPS circuit drives a power LED at output. When disconnect the energy while LED ON, if I reconnect the energy LED must start be as ON state. I need a ...
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1answer
38 views

Question Regarding Capacitive Sensor IC

I have this Capacitive Sensor IC I am trying to understand and analyze how to use this IC. In the datasheet, on page 13 - Function description, it is mentioned as "There are four selectable non-...
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1answer
109 views

Question about capacitive sensor designs with direct touch to copper or aluminum

I've seen some DIY capacitive touch sensor projects where the sensors themselves are strips of aluminum or copper soldered to a non-grounded wire, where the user touches these strips directly with ...
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53 views

Finger touch signal detection with microcontroller

I use darlington transistor for detection of touching. Finger or hand touch to BASE, only make about 0.8-0.9V voltage on the EMITTER side. How can i increase this voltage level to 3V for detecting ...
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66 views

Understanding Touch Switch with BJTs and Relay

We worked on this circuit today in one of my labs and it had my groupmates and I puzzled. We had a 1k resistor in series with an LED on the NO side of the relay. I searched for the circuit online and ...
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47 views

How do I read a simple touch sensor value from Arduino? [closed]

I suppose instead of connecting to the LED it will connect to A3 on the Arduino for example but I'm having a hard time making it work. I don't know which point on the circuit should be connected to ...