Questions tagged [capacitive]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
0
votes
2answers
48 views

Transfer function of a second order capacitive accelerometer

In order to find the transfer function of the accelerometer MMA7361L based on the information given in the data sheet 1 I first made a hypothesis that it a second order sensor since it has a ...
0
votes
0answers
11 views

how can I simulate the MMA7361L?

I wanted to know if there is a simulator that could include the model of the capcitive accelerometer NXP MMA7361L, and if there is a tool-box in matlab that could include it or should I find the ...
0
votes
0answers
28 views

Is there a material that I could use to generate cap touch presses? [duplicate]

I want to automate some testing that uses captouch as the interface for the human user. I would love to use an Arduino or similar's GPIO to create the equivalent press and release events from a finger....
1
vote
0answers
26 views

Bypassing Capacitive Touch Sensor on Wemo Insight

I have a WeMo Insight plug that I'd like to use to monitor the power consumption of my networking devices but unfortunately if the power goes out, the WeMo device will not come back on automatically. ...
0
votes
0answers
34 views

Where is the capacitive coupling in this adafruit soil moisture sensor?

Here is the moisture sensor: https://learn.adafruit.com/adafruit-stemma-soil-sensor-i2c-capacitive-moisture-sensor/downloads It has a large copper area insulated with soldermask that sticks in the ...
0
votes
0answers
14 views

Choosing between self capacitance and mutual capacitance sensors for proximity sensing

For a smart watch project I am trying to implement an reliable on/off wrist detection function using capacitive sensors (I have thought about IR sensors but they sometimes get falsely triggered when ...
-1
votes
1answer
101 views

Diy capacitive level measures sensor [closed]

I am trying to build an capacitive level measures sensor. I am new to this and if anyone can guide me in the right direction for a breakout card and so on. Requires: The size of measure level are ...
0
votes
2answers
67 views

How is the (dis)charging process of capacitors in series calculated?

How is the (dis)charging process of capacitors in series calculated? I know that $$C_{total}=\frac1{\frac{1}{C_1}+\frac{1}{C_2}+\frac{1}{C_3}+...}$$ $$Q_{total}=Q_{1}=Q_{2}=Q_{3}=...$$ $$V_{1/2/3}=\...
0
votes
1answer
47 views

Suggestion on Power supply design

I am looking for Transformerless power supply design. I have MCU 5V. and would like to drive 12V/24V relay with single LED. i have 4 pots 10K/200k for timing So i prefer 230VAC to 12V/24Vdc output ...
0
votes
1answer
40 views

Predicting and Evaluating Connector Performance in a Capacitive Sensing Application

I have built a capacitance measuring system using the Texas Instruments FDC2214EVM evaluation module. The system is used to monitor the location of the user's hand in an enclosed space, where ...
0
votes
1answer
55 views

How can I override a capacitive touch on-off switch? [closed]

I bought a floor lamp for use with a mechanical timer that turns electricity on and off using a set schedule (for example, when you're away but want to convince others that you're still at home). ...
1
vote
0answers
48 views

Ground mesh under the capacitive touch pad

I am going replicate a circuit basing from adafruit AT42QT10xx, I will be using the AT42QT1010 variant. The touch pad is the blue pad bottom layer, but there is this mesh on the top layer after i ...
0
votes
0answers
25 views

Triac failure and Capacitive Transformerless Power Supply Load

I have done a dimmer using a PIC microcontroller (with a Transformless Power Supply), with BT137 (sensitive gate, four quadrants), firing on QII and QIII, and its load an old fashion Edison style 220V ...
0
votes
1answer
81 views

how to make a variable light dimmer circuit without potentiometer?

I was looking at the Wemo Dimmer and thought to make one at home myself because the price of it is very much if I buy(including import duty). I searched for the knowledge which helps me create a ...
1
vote
3answers
136 views

Stability - Driving a Capacitive Load

I know I have been asked not to provide video links and ask questions. But I have no proper guide/mentor or anyone who can provide me better answers other than users in this site. So, please pardon ...
0
votes
0answers
37 views

Capacitive Power Supply Torch

I'm an amateur at electronics circuitry and concepts. I have designed a simple capacitive power supply using few web images and brief lessons. I understand that this type of transformerless power ...
0
votes
1answer
58 views

Qtouch with non-Atmel microcontrollers

Simple question really. Can I use Atmels Qtouch library with non-Atmel MCUs (such as an STM32)? It seems like Atmel has a solid line of capacitive touch ICs, ...
0
votes
0answers
71 views

Driving Capacitive Load

I did a bistable multivibrator drive NPN mosfet using timer55 and my mosfet drive power LED. Our Load has 3 circuit stage which are emc filter + smps circuit + power Led. I have a problem at that time ...
0
votes
0answers
61 views

How to prevent capacitive discharge on my load after MOSFET off state

I built a button on off latch circuit using nand Gates then connected latched output to Nmosfet's gate with a resistor. My load is a smps circuit drives the power Led and this circuit has emc filter ...
0
votes
1answer
119 views

Strange capacitive soil moisture sensor readings

I am in the process of building an automated irrigation system using capacitive soil moisture sensors and Arduinos. My challenge comes in with the soil moisture sensors bought from Banggood.com. I ...
3
votes
0answers
71 views

Does this circuit, used to subtract capacitive responce, have a specific name (picture in body)?

What I'm doing: I'm applying voltage pulses to thin films and measuring the resulting current transient, then using these transients to extract the hole mobility. The problem: When the films are ...
0
votes
0answers
47 views

Mutual capacitive (or projected capacitive) touch sensor design

I was trying to make a capacitive touch sensor with Tx and Rx plates like this: Can we connect drive electrode to 5V DC sqaure wave oscillator and measure voltage on receive electrode? Or connect ...
4
votes
1answer
198 views

How do I trigger capacitive touch screen electronically (without hands)? [duplicate]

I would like to trigger a "touch" or "touches" to a smartphone screen electronically without actually touching the screen with my finger using a remote control somehow. The idea would be that every ...
1
vote
1answer
55 views

What grounding should I use for this capacitively coupled input?

I'm designing a device that will receive and digitize analog video signals. In analog video, it's recommended to capacitively couple inputs. A typical input might look like this: In this case the ...
4
votes
1answer
112 views

Headphone Noise from Laptop SMPS

I have been facing an issue that has been a mystery to me for quite some time, and I wanted to see if someone here can potentially give me more insights on this so I can understand why it is happening....
1
vote
0answers
73 views

Does a Microcontroller act as a Capacitive load or resistive?

I'm designing a unity gain buffer (IC MCP6002) and in the datasheet, it says that a small series resistor is required at the output, if the load is capacitive and is >100pF. The input of the buffer ...
2
votes
3answers
215 views

Why is this camping light deadly?

I am learning, so go easy on me, if you can. In a video with BigClive, he takes apart a camping light and says it's deadly when you have mains plugged in and usb plugged in at the same time. In that ...
1
vote
1answer
50 views

Loading an Asynchronous Generator

I am doing an experiment that involves loading an asynchronous 50 HZ generator. For the load to consume current it has to be a capacitive load to cause a phase shift between the current and the ...
0
votes
0answers
67 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 ...
0
votes
1answer
103 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 ...
3
votes
2answers
144 views

Can transformerless power supplies be UL/CSA certified and is there any specific standard they must meet?

I am trying to bias a linear optocoupler on the AC mains side of a circuit, in order to transfer analog information to the secondary side of the circuit. I have designed the following capacitive power ...
3
votes
1answer
552 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
votes
0answers
162 views

How to safely switch a big inductive load with a Triac using a capacitor snubber?

I am building a Spot Welder with a big powerful transformer. I have to switch a big inductive load of 70mH (input of a transformer) The switching will be done with an SSR (Opto Triac Zero crossing SSR-...
1
vote
1answer
50 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 ...
0
votes
2answers
97 views

High pass filter is not resulting as good as the scope's AC coupling

I'm generating sine waves by using a micro-controller and DDS module. The output sine normally swings always positive between 0 to around 1V. But I want to generate a real alternating sine with ...
0
votes
1answer
70 views

Can I make a hole in a touch screen without ruining it?

I need to make a big capacitive touch screen with holes inside it, can this be done without ruining the whole screen? Thanks in advance.
0
votes
1answer
40 views

How does capacitive sensing relate to the resistance of the object entering the magnetic field? [closed]

Example: Setting up a capacitive area and dropping resistors of different sizes into the field, how do they affect the field differently? Are several resistors accumulative? Would i be able to tell ...
-2
votes
2answers
79 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.
0
votes
1answer
61 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 ...
0
votes
1answer
30 views

variation of thickness of dielectric layer for different textile-based capacitive pressure sensors

For my thesis I am working with textile-based capacitive pressure sensors and I am struggling to see how much variation in thickness of the dielectric layer you can have before you have noticeable ...
0
votes
1answer
52 views

Capacitive coupling: how to collect 60uA from this set-up?

I need to collect at least 60uA via capacitive coupling between a high tension Cu cable with PVC insulation and a connector that is acting as the opposite face of the capacitor (can be a copper plate ...
3
votes
2answers
486 views

Capacitive dropper failure

I have some fridge led light based on basic capacitive dropper. If I connect circuit to AC mains nothing happens. At first I checked all components for mechanical damage and than measured them out of ...
0
votes
1answer
116 views

powersupply ac to ac

I have recently bought a dcp917S and hoped I finally found a wireless chime that I can tie into my apartment buildings bell system. Since I live for rent there I can't do any changes that are not ...
5
votes
2answers
482 views

Help understanding/selecting SMPS to drive capacitive load

I recently bought several SMPS buck converter supplies for a project. They all had about the same specs, typically 90-270VAC input, 12VDC output. Having an expected worst case continuous load of about ...
0
votes
2answers
64 views

Suggestions on conductive materials for textile capacitive pressure sensors

I am doing preliminary research for my thesis. The thesis involves textile capacitive pressure sensors. I am trying to find out more about how the type of conductive material used affects the ...
1
vote
0answers
536 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 ...
1
vote
1answer
369 views

Increase Measurement Distance of a Capacitive Proximity Sensor - Arduino Project

So I am working on a project that I found online at (https://makezine.com/projects/a-touchless-3d-tracking-interface/). However, instead of using my hand to track, I want to track an aluminum ball ...
1
vote
1answer
328 views

Capacitive fluid level sensor design and insulation

This is a question regarding the measurement of a fluid level (in my case water) using a capacitive sensor. Capacitive sensors are a common topic, but I have one specific question: It is necessary for ...
1
vote
1answer
90 views

Using capacitive touch switch as guitar pick-up selector

I want to use two Schurter 3-101-401 one for each pick up. I was able to get them wired up but the signal for the pick-ups comes out no matter what. Here is the info https://www.mouser.com/...
1
vote
0answers
137 views

Finding the equivelent capacitance of the circuit

Finding the equivelent capacitance of: simulate this circuit – Schematic created using CircuitLab I think that it should be: $$\frac{1}{\frac{1}{C_1}+\frac{1}{C_2}}+\frac{1}{\frac{1}{C_3}+\...