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Questions tagged [touch]

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How to identify this IC FG97

I'm trying to identify an IC labeled FG97 1847 17145. It is a 16-pin SMD.
HNLinh's user avatar
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Touch Screen Panel of Car Radio Set-up

The Touch Screen of Car Radio Setup was damaged and removed. HD 6.95 INCHES WIDE SCREEN TFT (HG-070) A capacitance touch screen was replaced with the IC GT911 6Pin. Its working good except the Icon on ...
Trevor D's user avatar
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1 answer
35 views

TP223 replacing a button?

I have a button which does some resistor-alteration: simulate this circuit – Schematic created using CircuitLab Now I wish to replace SW with TP223 (link): ...
Daniel's user avatar
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87 views

ATmega328 experiences freezing or hangs when the ceiling fan is turned on or off

I've been working on a project, but I've hit a snag. Every time I try to turn the ceiling fan on or off, ATmega328 gets hung/freezes. Let me break down the project for you, so you know what's going on ...
mechaTronics Tech's user avatar
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0 answers
58 views

esp32 s2 touch sensor read

I have a problem with capacitive sensor. I have created PCB with 2 capacitive sensors. Everything is working fine and ESP32 s2 mini reading values as I expect while I powering up esp32 with type-c 5v, ...
Ignas Navickas's user avatar
0 votes
2 answers
123 views

Trigger a 3 V line with 12 V

I would like to trigger a 3 V line (a push dimmer circuit) with a touch button (which is powered by 12 V). Closing the 3 V will turn off (short press)/turn on (short press)/dim (long press) the LED ...
ZTHawk's user avatar
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0 answers
49 views

Measure capacitance on a mutual capacitive touch sensor

I interpret the mechanism of a mutual capacitive touch sensor like this: There are 2 electrodes X and Y. To measure the difference in capacity, the X electrode is driven high (i.e 3.3 V) and the Y ...
Maze2Go's user avatar
1 vote
1 answer
77 views

Looking for a large capacitive touch array controller

I'm building a capacitive touch panel. It has an odd shape, so I resulted to building my own with the capacitive diamond array solution. It doesn't have a screen underneath, so it's all contained on a ...
Tamás Fehér's user avatar
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57 views

What is this component and what function does it serve?

I am learning to build a touch switch using a TRIAC. I took apart a commercial switch that is activated by touching the thin white wire. I identified all the components, except one (the one that I ...
ocobotec's user avatar
0 votes
2 answers
161 views

Touch button bypass on fan with smart inching switch [closed]

How can I bypass the touch button on fan Sencor SFE 2340WH? I want to of/off fan with smart momentary switch. Below is componets maybe with reading errors. Components: TR1-TR5: HSDQ / BT134-800 / ...
Danster's user avatar
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0 answers
40 views

Need advice on tapping into touch screen connected to LCD

I'm hoping to get some advice on a technical issue I'm currently facing. I am attempting to tap into a touch screen that is connected to an LCD, but I'm feeling a bit confused about how to proceed. ...
Jonas's user avatar
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1 answer
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Is there a single cycle wave trigger circuit?

Is there a circuit design where if the input is high (at any length of time), the output will only be one cycle at a fix amount of time? I'm currently working on a capacitive touch switch (I'll use ...
Igcasan's user avatar
  • 11
1 vote
1 answer
130 views

Using skin to close low-voltage circuit

I am trying to create a ping pong ball sized light-up ball that should light up when held in my hand, as in the 80's toy inspired by the movie/television series "Star man". The circuit must ...
Erik's user avatar
  • 11
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1 answer
84 views

Error in blinking an LED using GPIO_12 of an ESP32

Here is my code: ...
Imran Mumtaz's user avatar
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0 answers
71 views

Electrical noise between dimmer circuit and halogen transformer output

I am currently building an ESP32-based dimmer control for halogen transformers. The dimmer should be controlled by touching any part of the transformer output circuit. Thus, I somehow need to connect ...
Ercksen's user avatar
  • 101
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1 answer
271 views

Resistive finger PCB button

I want to do something similar to this question: PCB "Touch" Button However there the PCB was not described that much. I have a design where each 'finger' is 1mm apart. And I'm not sure ...
Anton Krug's user avatar
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241 views

LED driver circuit works only when I touch it with my finger

I'm trying to convert an E14 RGB LED bulb to be able to power it from a lithium battery. Inside the bulb are 2 PCBs - a transformer and a LED driver - which are connected by 3 wires. Black and red are ...
Artur's user avatar
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1 vote
1 answer
96 views

Odd 4x3 touch keypad performance using TTP229

I designed a 4x3 keypad using a TTP229-BSF and an ESP32. The board works perfectly when I put 4 mm plastic over the board. But when I add 2.5 mm of plexiglass over the plastic, some of the keys (3, 6, ...
salar1991's user avatar
0 votes
2 answers
317 views

I need help building a low-cost contactless water sensor

I tried to build a contactless water sensor with some touch ICs, but all of them use auto calibration features i.e. they can sense the presence of water without contact but after some seconds, they ...
Amrit Aryal's user avatar
2 votes
1 answer
487 views

How can I use a microcontroller to trigger an existing capacitive-touch pad?

(Note: I have found several other questions on a similar topic, but none of them address my specific issue.) I have a lamp that is controlled by non-contact touch buttons. The user-facing surface is ...
Sod Almighty's user avatar
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0 answers
232 views

Problem with TTP229-BSF using Arduino Uno

I'm trying to use a 16-channel capacitive touch sensor named TTP229-BSF with an Arduino Uno. I use the following code it works correctly when i touch directly but when i place two 4 mm plexiglass pads ...
salar1991's user avatar
0 votes
2 answers
559 views

Bypass touch sensor IC with a button?

I want to replace a capacitive touch sensor on a circuit board (I think it’s a TTP223) with a tactile switch to overcome over/under sensitivity issues. I have wired a switch to ground and the CMOS ...
johnnydanger's user avatar
-1 votes
2 answers
60 views

What is the best way to achieve triggering a function on device contact?

Let's say I have a smart pen. It has a microcontroller that can communicate with my server. I want to have a really small and flat gadget (let's call it The Receiver) that when you touch it with that ...
Marin Dedic's user avatar
1 vote
1 answer
88 views

Discrete resistive touch sensing circuit not being able to be detected by animals [closed]

Looking to build a conductive matt that is split in two with a insulator in between them to allow detection of when a dog or cat walks over it and completes the circuit through their body, but as both ...
user66001's user avatar
  • 115
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0 answers
798 views

How to trigger cap touch sensor without touching it?

I have a device that has metal spring connected to microcontroller pin that has in-built cap touch sensing . This spring is used to turn the device on and off. I plan to place the device in ...
tuadru's user avatar
  • 11
0 votes
3 answers
298 views

Relay is switching by touching optocoupler with finger

To switch a 12V relay with a micro controller, I designed ("borrowed") this schematic. Build the pcb and it works great. But there's a little bug that got me a bit worried. If I touch the ...
satoer's user avatar
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1 vote
2 answers
4k views

How to setup a GT911 touch panel using Arduino? (I2C communication)

I have a 9 inch touch panel which has a GT911 controller and works with I2C. I should configure its registers and then read the touched points' coordinates. It has 6 pins (Vcc, GNd, INT, RST, SCA, SDA)...
Mohammad Ebadi's user avatar
0 votes
0 answers
81 views

Any glaring mistakes in I2C touch & OLED PCB design?

Would greatly appreciate any expertise/suggestions on solving this problem! In particular have I done anything glaringly stupid when it comes to my PCB design?? I'm trying to get touch control ...
EDIflyer's user avatar
0 votes
2 answers
288 views

Issue with a touch switch

I made a touch switch in PCB based in the following schematic When touching the plate with a finger the BJT turns on and the 555 trigger pin goes LOW activating the pin 3 (OUTPUT). The time the ...
AmssmA's user avatar
  • 508
0 votes
1 answer
627 views

ESP32 - Touch sensors with 1 meter wires

I am trying to use the Touch sensitive pins of a ESP32. Problem is that between the ESP32 and the actual touch pads there is 1 meter of wire. without the cable attached the value is > 200, but as ...
sharkyenergy's user avatar
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0 answers
36 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. ...
Dharmik Prajapati's user avatar
1 vote
1 answer
99 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 (...
sophonet's user avatar
0 votes
0 answers
50 views

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 ...
UserRR's user avatar
  • 261
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0 answers
83 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. ...
Pierre_F's user avatar
1 vote
1 answer
380 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. ...
mjhuffer's user avatar
0 votes
1 answer
98 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....
mdre's user avatar
  • 3
0 votes
1 answer
300 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 ...
Berker Işık's user avatar
0 votes
1 answer
328 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 ...
user avatar
-1 votes
1 answer
817 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 ...
Fotis Charchalakis's user avatar
0 votes
1 answer
248 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 ...
Luke Tiday's user avatar
0 votes
0 answers
156 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 ...
Steve's user avatar
  • 101
1 vote
1 answer
92 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 ...
Andy Harvey's user avatar
1 vote
1 answer
98 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?
Anna's user avatar
  • 795
0 votes
1 answer
75 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 ...
jblakes34's user avatar
0 votes
2 answers
1k 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?
Berker Işık's user avatar
1 vote
4 answers
2k 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 ...
Rishabh's user avatar
  • 153
1 vote
0 answers
152 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 ...
Wheatley's user avatar
  • 690
0 votes
2 answers
201 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 ...
IHK's user avatar
  • 99
1 vote
1 answer
57 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-...
user avatar
1 vote
1 answer
704 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 ...
Nick Nagy's user avatar