Guide QT110 Touch-Sensitive Button Guide

I've got a question: I want to make a switch panel and set up about 8 or 10 touch sensitive buttons.(Touch & Proximity Sensors, whatever you like to call them)
Won't they be interferring (is that spelled right? Annoying each other) with each other? I mean whem I push 1 button in the middle, is there a chance that I would be touching 3 because their touching fields are similar on some spots?

 

you can set the distance they work at. you could set it so low that you actually need to touch the spot its on to make it work. make them only work when within 2mm of it or something.

 

No, you'd better go for a QT1080 then, it has AKS :

from the datasheet, so if you'd looked it up yourself, you'd already know that ^^

[edit]In dutch :
Als ge ne QT gaat bestellen, laat dan iets weten, ze hebben ze hier in België enkel bij farnell, en daar moet ge dachtek een minimumbedrag hebben eer ge kunt bestellen als particulier

 

Hi.
Wauw, this is a nice peice of info you have made there.
Can be used for multiply purposes.
I had an idea, for the ones that was interrestet, think it's a great idea myself, and it will combine 2 mods form the forum. neat isent it
http://forums.bit-tech.net/showthread.php?t=72775&highlight=winamp+change
This one.

The other mod is where you can make a bottom external from you'r pc that can pause, play, skip, ect ect you'r winamp.
I may wanna make thise mods, Then I'm gonna glue a little round CU. peice on the table, dremel a "Play" logo onto it, and voila.. a external touchsensitive winamp changer.

Nice guide, explain the real basics, allthow I'm no elektro nerd. Only a elektrisian.

 

, I was just designing this for my computer, and thought i would have an orginal. But on the bright side, now I know for sure it works

Nice guide, I will surely use it on my next case.

 

just wondering if you could show some pics of the electrode... i'm kinda confused on what to use (just like a piece of metal or what?) and lets say you connected it to the front metal face plate of a case, would the entire front be touch sensative or only a certain smaller region? that question is kinda confusing... if you need me to claify i will, but pls post some pictures of this electrode so i could have an example.

thanks dude, never knew these things existed... wow

 

from what i understand, just connect it up to a piece of metal roughly the size of the button u want (washer, mesh, plate whatever). If u connect it up to the metal front of u'r pc then the whole front would be a button.

Excellent guide, and when i get the money to buy some components (using laptop at mo) and custom build my wooden case, i will use for sure. Better looking and way way cheaper than the bulgin vandal switches, and one hell of a lot cooler.

 

if you want more than about two buttons, it would probably be cheaper to get the 4 button version of the QT110, and if you want 8 buttons, unless you know about serial transmitions/can program a PIC chip youd be better off getting several of the four button ICs.

The IC's with more than four outputs basicly dont give you a natuarl output, so you would need a decoder of sorts.

thought this info might help you all.

 

one thing im unclear on is how you adjust the Cs i think you mentioned...to adjust the sensitivity of the electrode.
i may have missed it but read through every post. so im sorry if you have already explained this part.

Great guide!

to prevent a metal face plate from becoming a huge electrode could you just put some sticky tape or a similar insulator between the metal face plate and the electrode?

Gary!

 

if your electrode is too sensative, either:

make the electrode smaller
make the electrode into a mesh as opposed to a solid

From the data sheet:

More Cs = More Sensitivity

so if you lowered the value of CS slightly, it would make it less sensitive

 

what is the difference between QPROX and an SM TOUCH SENSOR?
those are the options at au.farnell.com
and there are also versions of both with a "G" at the end eg "QT110-ISG"

 

Hope this isn't a stupid question, I've looked at the datasheets and qprox.com and couldn't find what I was looking for (might have missed something though).

Are they all just a boolean output? Do any have an analog output?

The reason I'm asking is I have a small touchscreen lcd (8") in my car. The touchscreen pretty much makes it unusable due to the large amounts of glare from the touchscreen itself. I was thinking along the lines of having a sensor in each corner and calibrating it to detect position.

Whether this is possible or not, I've no idea.

 

thaks but is thier any easier way to make one? Or buy on for cheap at Radioshack etc.

 

Hey, this is a great guide but i have a question, is this setup for momentary switches or on/off switches and can you calibrate it for either? I'm having at least four buttons so i was thinking about just going with the 4 button eveluation board (the blue one):

http://www.qprox.com/products/qt2xx.php

but its a bit expensive so i was also contemplating making 4 seperate boards like the ones in this guide.

 

@ shotgunefx: No, they are logical high and lows, you might have better luck with a IR LED & Sensor grid array.

@ greensabbath: You can use the OPT1 and OPT2 wired to either High (5v) or Low (0v) to change wether they are momentaty or latching.

 

Guardian

I am trying to make a touch volume slider,

Do you know what chip i would need to create a touch volume slider? Or would i simply wire up a number of 110's with AKS.

 

i would use a MAX5456 or MAX5457 or Similar Link

and use a couple of QT110's as the button inputs.

depending which MAX chip you use, it would give you Volume up/down & Balence

one of them uses 3 buttons:

Up / bal Left
Down /bal Right
Mode

so you could use 3 QT110 or 1 QT240, which is 4 buutons, so you have a spare button too.

 

Take a look at their Q-Slide and Q-Wheel sensors.

 

Ok I never done anything with electrical before and I am trying to make a four button thing, but am just testing the setup with only one button.

I've got the QT140 28-Pin DIP (Datasheet )

Ok my first question is do I need an oscillator, it sounds like I do, I don't know exactly what an oscillator is, but it sounds like a timing device, so it is probably needed for the max-on thing.

I am not sure exactly what I need to hookup to make this work. If it is possible could I get someone to write it out in english what I need to make this work.

Thanks

 

It is clear after reading this thread and the datasheet for the QT110, that this part sets a pin high (or low) upon detecting a finger. I need a part that also detects the removal of a finger. That is, I need a part that sets a pin high when a finger is present and then sets the pin low when the finger leaves. Does the QT110 do this? What part does this?