The capacitive tag has no wiki summary.
3
votes
1answer
128 views
What are those black things on the board?
I'm a beginner in electronics, and I'm ignorant of many basic things.
Check out these black things on the board:
These are from a capacitive keyboard.
I'm disassembling it and I want to connect ...
-4
votes
0answers
47 views
Need idea for Ardunio Project create electric Capacitive Screen Pen [closed]
I want to create Arduino project that can replace finger to touch iPhone screen.
I wonder how can I make some device with 1 x 1 cm. surface with electronic input to touch one iPhone screen and then ...
0
votes
1answer
260 views
Water level: BIG capacitive level sensor with steel bars?
So I want to measure water level under a bridge, or inside the city drain.
Would it be possible to run two long (4 meter) metal probes, each one enclosed inside a PVC pipe, and placed one next to the ...
2
votes
3answers
153 views
Simplest touch sensor for a copper surface
I'm looking for the simplest way to implement a binary on|off touch switch using a single pole. The touch surface is copper. The position or pressure of the touch is not needed, just simply:
On = ...
3
votes
2answers
234 views
Designing a Transformerless power supply
I am working on a transformerless PSU for maiking a 3nos.x3 watt led, each having forward voltage around 3.6v and current around 650-700ma.
I have worked on this kind of circuit:
I guess a 1uf ...
1
vote
1answer
77 views
Replacement IC for the touch-button QT1081?
A project I'm working on needs several touch buttons. I found the datasheet for the Atmel QT1081, which supports up to 8 capacitive buttons, with the added advantage for our circuit that there are ...
1
vote
1answer
92 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 ...
2
votes
1answer
142 views
How to drive and control capacitive load?
There is electrochromic film (which is some kind of capacitive load) that need to be driven with 50Hz alternating current, load voltage should be controlled in range 0-100V (with 8 or more fixed ...
6
votes
1answer
418 views
Driving LM3886 at 100 KHZ in Bridge Tied Load (BTL) configuration?
Would someone have experience with driving a pair of LM3886 Overture Power Amplifiers in BTL with up to 100 KHz sine wave?
My parameters:
Frequency band of interest: 20KHz to 100 KHz, sine wave
...
3
votes
0answers
121 views
Capacitive touchscreen
I am doing project in which I want to perform read and write operation by using a capacitive touchscreen. What I know is I can trigger capacitive touch screen by:
By using electromagnet as I heard ...
2
votes
2answers
312 views
Is there a 10X probe compensator BNC, but with out the probe?
Is there such thing as a compensation BNC like the ones found on 10X probes? I'm basically taking about a BNC coupler with a resistor and a adjustable cap in it. I guess it would be like a standard ...
2
votes
0answers
202 views
Formulas for Integral Components
Formulas for Integral Components:
I am looking for "simple" approximative formulas for integral components. In particular for:
A grounded interdigital capacitor (i.e. above a ground plane and with ...
0
votes
0answers
534 views
How to maximize capacitive touch/proximity sensitivity of MPR121+Arduino
I am using Sparkfun's MPR121 breakout board with an Arduino to sense proximity/touch to a number of electrodes. There are long (~10m) shielded wires running to the electrodes, which are aluminum tape ...
1
vote
1answer
172 views
Smallest touch that can be detected on smartphone touchscreens
Not sure if this is the right place to ask this question, but what is the smallest touch (in terms of height and width) that can be detected on most smartphone screens (capacitive touchscreens found ...
3
votes
3answers
334 views
Is FR4 waterproof? What about soldermask?
I'm investigating ways of making a capacitive sensor that will operate in very moist environments, potentially even submerged. What I need is a way to make some conductive plates in a specific ...
2
votes
3answers
906 views
Conducting plastic for capacitive touchscreens
As I am disabled I have to use a headstick (see picture below) to do stuff on the computer. I also have a phone with a resistive touchscreen, which works well with my headstick.
But here is the ...
3
votes
2answers
586 views
Triggering a capacitive sensor electronically?
I'm working on a little project I call my "Green Box". Basically, I'm trying to drop my electric usage as low as possible, without losing the convenience of my gadgetry.
So far, I'm incorporating a ...
1
vote
3answers
709 views
PCB Matrix Touchpad?
Is it possible to DIY your own capacitative touchpad on a PCB? The last page of this mentions it:
...
2
votes
5answers
859 views
Can a water drop do a “fake” touch on a capacitive touchscreen?
If a capacitive touchscreen is hit by water drops, like rain, will it report a touch?
I'm trying to evaluate what is the most appropriate touchscreen solution to use in an outdoor kiosk.
11
votes
8answers
8k views
Capacitive Touchscreen for DIY usage?
Anyone know of a good source for capacitive touchscreens in low quantity at a reasonable price? Just something to play around with in projects, I'm interested in either small (eg for portable ...
8
votes
5answers
821 views
Capacitive Sensing
Is there a way that I can make an Arduino or other Micro-controller detect a change in capacitance?
I'm thinking of having a screen on my door that only turns on when you touch the metal door handle. ...
