Description: If you need to add user input without using a button, then a capacitive touch interface might be the answer. The AT42QT1010 SparkFun Capacitive Touch Breakout offers a single capacitive touch button with easy-to-use digital I/O pins.
The AT42QT1010 is a dedicated, single-button capacitive sense chip. The chip handles monitoring a conductive area for touch. As long as a touch (e.g. from a finger) is detected, the AT42QT1010 keeps the output line high. Otherwise, the line is kept low. You just need to provide a power source (1.8V - 5V) and ground for the AT42QT1010 to work. Additionally, a PAD pin is available if you would like to create your own external electrode.
Based on 4 ratings:
This Atmel breakout has been terrific in prototyping single touch capability into my project. In general, breakouts that are 1) small and 2) adjustable are the most useful and Sparkfun has gotten the knack for them. For this particular breakout, it has a few key attributes that assist in prototyping. First it has a touchpad connection that easily allows the extension of the pad into your application. Second, it has a connection for the logic level output from the controller. So, in addition to the built-in visual indication, you can easily hook the logic output to something else. If you want to disconnect the LED, there is a solder jumper for that too (no severing lines permanently with an Xacto knife!). Anyway, you get the idea. These little boards are the reason Sparkfun is always the first stop when I am cobbling together an initial concept with bailing wire, duct tape and breakout boards!
Very good and reliable circuit.
It works very well.
I’ve used a number of these in a museum exhibit and they’ve been working well for over a year now. I attached wires to them and then to copper boards but found they were way too sensitive, so I ended up coiling up the wires behind the copper boards and they act as antennas. It took a bit of work to get them just right, but they work perfect now.