QT113 Datasheet | Parallax

Web Site: .parallax. Forums: forums.parallax. Sales: sales@parallax. Technical: support@parallax. Office: (916) 624-8333 Fax: (916) 624-8003 Sales: (888) 512-1024 Tech Support: (888) 997-8267 QT113 (#604-00038) General Description The QT113 touch sensor is a self-contained digital IC with optional latching and momentary functions. The chip can project a proximity sense field through air, via almost any dielectric material, such as glass, plastic or ceramic. The user can also use an object with metal in it to create a sensor, responsive to touch. Features - Projects a proximity field through the air - Less expensive than many mechanical switches - Only one external part required - a capacitor - 8 pin DIP package - patible with all BASIC Stamp® & SX Microcontrollers Application Ideas - Light Switches - Security Systems - Prox Sensors - Toys & games Connecting and Testing The example circuits below show the QT113 in both Stand-Alone Mode as well as using the BASIC Stamp to read the output. In both cases the LED lights when the sensor is activated. The output of the QT113 is active low. When using the BASIC Stamp, removing the LED will make the output to the Stamp Module more stable. Stand-Alone Mode Using BASIC Stamp © Parallax, Inc. - QT113 (#604-00038) - v1.1 08/2005 Page 1 of 4 Calibration The QT113 is 100% auto-calibrating. Sensitivity The sensitivity of the QT113 is adjusted by a single capacitor, and can be set to one of two gain levels by setting pin 5 high or low. Sensitivity can also be increased by using a larger electrode or reducing panel thickness. Please see the datasheet for more information on adjusting the sensitivity. Resources and...