All Questions
Tagged with capacitive sensor
46 questions
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138
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Convert capacitive sensor into physical button?
Is it possible to turn a capacitive button in to a protruding mechanical one?
I am thinking something round that sticks to a surface with a capacitive button on it and is essentially just a button ...
- 111
3
votes
2
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743
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What is the maximum reasonable cable length for a humidity sensor?
I have an ESP32, and use capacitive soil humidity sensors to check the humidity of my plants. They get shipped with about 15 cm of cable attached.
What is a reasonable/safe cable length I can use ...
- 297
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2
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640
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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 ...
1
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0
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120
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Correct design of capsense controls
I am trying to design a PCB with some capacitive controls. My first iteration did not seem to work well:
This was a 2-layer 1.6mm board with one circular control, and 5 buttons. The board is 48mm ...
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-1
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1
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313
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How to detect which finger touched the mobile screen [closed]
I'm working on a project where I need to detect which finger touched the mobile screen i.e capacitive screen.
I'm not talking about double finger touch or single or drag and move etc. I'm asking which ...
- 115
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0
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181
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Capacitive touch sensor senses every materials touch
I have a ttp223 capacitive touch sensor. It has three pins, VCC GND and I/O. I left I/O open for test purposes. I connected the VCC to 5V and GND to ground. When I touch the sensor, its led indicator ...
- 389
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0
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82
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Grove capacitive fingerprint sensor not working
I have just purchased one grove capacitive finger print sensor.
link.
I am using Arduino Nano and followed there tutorial but the example code isn’t working.
Blue light on sensor never turn to green ...
41
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10
answers
5k
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How can human finger pressure be measured?
I am dealing with a situation where a patient can only very lightly press his fingers / hand to signal what he / she wants. Speaking or eye tracking is not possible.
The person is also not able to ...
- 519
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28
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How to improve capactive sensor when there is a floating local ground [duplicate]
I am using a microchip MTCH101 IC as a proximity detector (based on a self-capacitance electrode) and i have some trouble in detection because of a floating local ground (i guess). The sensor is power ...
- 43
1
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1
answer
128
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Capacitive medium range sensor with STM8
I am trying to replicate the behaviour of this library: https://playground.arduino.cc/Main/CapacitiveSensor/ with an STM8, but I am not able to do it. I want to detect the proximity of the human hand ...
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153
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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 ...
- 690
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5
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385
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Capacitive Switch To Distinguish Between Metal and Plastic
I have an application where a rotating plastic wheel has ferromagnetic inserts on the circumference of the plastic wheel (they don't stick out). Shown below in the picture is the plastic wheel (black)...
- 143
1
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1
answer
59
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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-...
user220456
1
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1
answer
865
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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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0
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101
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How to read out a capacitive sensor, (CDC, CVC, TDC)?
What are the main principles for reading out a capacitive sensor? I read a lot, but I cant figure out what re the different options.
I think that an option is to convert the capacitance into a ...
- 41
1
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0
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197
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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. ...
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1
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1k
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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).
...
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0
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1
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49
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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 ...
0
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1
answer
54
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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 ...
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2
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108
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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 ...
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2
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1
answer
791
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Increase measurement distance of a capacitive proximity sensor - Arduino project
I am working on a 3D tracking interface project that I found online here.
However, instead of using my hand to track, I want to track an aluminum ball with a 2 cm radius, which is connected to ground....
- 21
2
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1
answer
920
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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 ...
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3
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2k
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Soil moisture sensor - Interdigital (FEF) vs Coplanar
I am working on the development of a low cost capacitive soil moisture sensor which uses dielectric permittivity changes to estimate moisture.
I found that interdigital capacitor based on FR-4 has ...
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1
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421
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Design of capacitive proximity sensor
I am currently designing a microgripper for which I need a proximity/distance sensor.
Please refer to the image below for design requirements.
Due to the force application (as shown in the image), ...
- 111
0
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1
answer
264
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Capacitive sensing with large distance
I am curious on how capacitive sensing work. How does it sense hand gesture, or measure water level when the distance between the capacitance plates are large (5-10cm)?
I thought that capacitance ...
- 235
2
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3
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509
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Sensing the capacitance value of a material - for an ID system
This is a follow up question to 'How does a Capacitive ID / Signatures / Sensing system work? e.g. Google Bloks'
In the 'Google Bloks' project. A tangible programming experience is created by ...
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2
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2
answers
281
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Minimizing capacitive crosstalk in open collector quadrature speed sensor
I am integrating a speed sensor (Honeywell SNDH-T4L-G01) which comprises 4 lines: VDD, VSS, A, B. The last two signals provide speed and direction information in a quadrature format.
These are open ...
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1
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634
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Heartrate measuring using capacitive touch sensor
I am new here, and I hope someone could help me.
So I've read in the datasheet of the capacitive touch sensor ATMEL42QT1011
that we could use it as a heart rate sensor.But what I don't understand is ...
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3
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1
answer
6k
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Homemade shielding of a wire to a capacitive sensor
I'm using a capacitive sensor CAP1188 with Arduino, connecting 8 of its touch sensor inputs to 8 copper boards that I want to be the actual touch surfaces.
The wires to the sensor are quite long (100 ...
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1
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2k
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How to obtain the transfer function of the capacitive sensor?
I want to obtain the transfer function of this capacitive sensor which in the circuit, C is the variable capacitor that transforms displacement to electrical signal and E is the dc voltage source ...
2
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1
answer
2k
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How does capacitive EEG electrodes measures EEG signals
I have read the following sentences from an article:
The effect that there are also charge displacements on the body
surface due to brain activity is used for the capacitive measurement
of the ...
- 325
3
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0
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97
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Touchscreen Sniper [closed]
I was reading today about how capacitive touch works. This article on the Arduino site mentions that with a 40 Megaohm resistor you could detect an untouched "touch" from possibly 24 inches away.
My ...
- 503
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1
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83
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How can I interface to a capacitive sensor and measure its value with my Netduino?
I've just bought a rain detector, not realizing it is a capacitive sensor (I had assumed it was going to be resistive, as most are). However, being capacitive means it can be sealed so no electrodes ...
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1
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1
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228
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Capacitive Sensing and Dielectric Coupling
I have a design that uses the MPR121 capacitive sensor. It's a very simple board with 10 "slider electrodes". Standard 2 layer construction with FR4 .063" thick.
The board interfaces with a ...
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1
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1
answer
4k
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capacitive sensor and wire length
I'm a newbie and I've been playing with the awesome Adafruit CAP1188 capacitive touch gizmo.
As long as I keep the length of the wires from the CAP1188 to my copper sticky pads to a couple of feet, ...
- 111
4
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3
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20k
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How do you measure soil moisture using a capacitive sensor?
There are a number of capacitive moisture sensor designs on the internet, which use the insulated copper pads on a PCB.For example:
http://zerocharactersleft.blogspot.in/2011/11/pcb-as-capacitive-...
- 405
0
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1
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474
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Capacitive sensing between two copper plates
Is it possible to detect touch event and its position coordinates between two copper plates spaced apart by approximately 6-7 centimeters? The space between plates have to be transparent.
- 356
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1
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615
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What sensors can accurately detect size of content in a closed container such as number of pills in a pill box?
I am a DIY enthusiast playing with different sensors and electronics.
Recently I've been trying to make a pill box for my grandparents to track their medicine intake. However, I cannot determine ...
2
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2
answers
1k
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Capacitive touch directly above LEDs
I'm trying to make a design where the user can run his/her finger directly over a series of 10 LEDs (covered with 1 mm glass), and the LEDs should glow on/off based on the finger's position.
I wish ...
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1
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0
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75
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Capacitive where is the touch?
I am a newbie in the world of circuits and electronics. But we all started somewhere.
I have this idea about a street sign that should be used as an instrument. All most like a Theremin. Touching it ...
4
votes
2
answers
722
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Choice of sensor for detecting touch (on/off)
I would like to detect a user's touch on a shop window (at a specific area, there would be a 'call to action' marking on the window, i.e. 'touch here')
Any sensor to detect this must be contained ...
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1
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0
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448
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Can I use a capacitive sensor to detect a person proximity without touch?
I only see uses of capacitive sensor to detect touch. But I wonder if I can calibrate a capacitive sensor to detect if a person is close enough, even if the person is not touching it.
I intend to use ...
- 11
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1
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4k
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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 ...
- 207
5
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3
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11k
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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 = ...
- 287
3
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3
answers
3k
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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 ...
- 3,820
10
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6
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3k
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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.
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