Capacitive/Touch Sensor chip?

[Conrad_Turbo]

I saw on here somewhere a short while ago a single chip that could be used for a touch switch application. All it required extra was a capacitor and the chip cost around $2. Anyone have any idea what it is? I can't find it on here for the life of me!

 

[KMoffett]

There are "touch switch" IC's made by:

https://www.qprox.com/

I've used them for display activation switches. The schematic is for a display control to allow either "touch on/touch off" or "touch on/timed off" (selected by jumper J1). T1 is wired to a foil-backed sign on the inside of a glass display case. T2-T3 go to the LED input of an SSR. Hand proximity to the sign starts the display.

Ken

 

[Conrad_Turbo]

That's exactly it!

Not so cheap at $3.50 a pop...any idea on where to get samples? Digikey won't sample them.

I only need 2 or 3 and I know I'll get dinged with $10-15 shipping for a few dollars with of components.

 

[ericgibbs]

That's exactly it!

Not so cheap at $3.50 a pop...any idea on where to get samples? Digikey won't sample them.

I only need 2 or 3 and I know I'll get dinged with $10-15 shipping for a few dollars with of components.

hi Conrad,
If you are on a tight budget, you can make your own switches.

**broken link removed**

Google: 'cmos touch switch'

 

[Conrad_Turbo]

hi Conrad,
If you are on a tight budget, you can make your own switches.

**broken link removed**

Google: 'cmos touch switch'

Thanks for the tip, if I had those components kicking around I'd build it...but since I'd have to order it...I just ended up ordering the qprox unit from Digikey.

 

[Blueteeth]

You could always make your own capacitive touch switches using a microcontroller? Not as stable as the q-touch ones, but linear sliders, and buttons are possible. You can even use LED's in this way..far better than using their 'light sensitive' qualities.

Blueteeth