How the Capacitance touch sensor (button-switch) works

Link to page: http://pcbheaven.com/wikipages/How_a_Touch_Button_works/

In this theory page, i explain how the touch switches (buttons) work. I cover various methods, the resistance touch sensor, the AC Hum touch sensor and the capacitance touch sensor. I extensively cover the capacitance touch sensors. Also, i explain how a capacitance touch sensor can be used to make buttons that are covered under non-conductive materials, such as plastic, wood, plexiglas etc.

This video is the second part, in which i explain the capacitance touch sensing techniques.

Category:

Science & Technology

Tags:

• electronic
• circuit
• pcb
• schematic
• diy
• project
• tutorial
• educational
• how-to
• how
• to
• do-it-yourself
• do
• it
• yourself
• electronics
• technology
• theory
• touch
• sensor
• switch
• button
• capacitive
• capacitance
• capacitor
• detector
• science

[dying2l]

Hi sorry to bother you with a stupid question but can you tell me how rubber buttons like the ones on my keyboard work? I want to make a silent button.

[pcbheaven]

@dying2l they have a rubber piece like spring, and this piece has some kind of conductive material in the middle. When the button is pressed, the conductive material touches the PCB underneath. There are 2 pads on the PCB that the conductive material touches and closes circuit.

[dying2l]

@pcbheaven oh.. that's it? lol Thank you! Know where I can buy the parts or what it's called?

[pcbheaven]

@dying2l go to my website and find the touch sensor circuits.

[fukjo]

is schematic avaliable ?

[pcbheaven]

@fukjo sure there is. visit my site and go to the "circuits" session. i have 3-4 different circuits.

[ALLTENCH007]

Hello, I am looking for abit of help. I am creating a capacitive touch system with blue and Red LED'S that light up when touched. This is for a friend who has a disabled child, and it is going to be a learning aid for them. hav 2m of blue LED's and 2m of red LED's + x8 AA cells. I ned to create x2 capacitive touch pads that are 20x20cm and when the system is on the Blue LED's are lit up when either of the pads are touched, it changes to Red LED's on, and blue off, so it basically switchesLED'?

[maxwellpassion]

damnit I like it when people speak in claer english. I'm not hating on you, I'm just saying, since I'm english and I'm used to my own accent, it's easier to comprehend my own accent. It's not racist to prefer the ability to comprehend what people are saying, and I think people should just state the truth more often without coming off as racist, because it's really not racist at all, it's just an honest difference. People ARE different, you know! lol

[EngrKenXi]

ure very good sir! thank you very much, though the accent sounds funny. but its perfect as it keeps me awake ;)

[nrdesign1991]

This is a great explanation. Thank you very much! :-)

[HEARTBROKERist]

best for study

[MrTonyHenrique]

Hello! Can you make a demonstration of this, using more buttons, close together?

[oddballlw]

Fascinating demonstration! This is a very clear and understandable explanation of this technology. Thanks!!