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Mechanical Keypad Replacement with Capacitive Touch

With simple and easy to use capacitive touch designs that exist today, replacing a button with a touch sensor is straightforward. The sensor detects the presence of a finger and toggles an output pin high or low to mimic a mechanical button’s ON/OFF state. However, replacement just doesn’t end here. There are special types of mechanical user interfaces which will not work with a 1:1 input-output, including mechanical keypads. Although mechanical keypad interfaces are simple, their replacement does require more work than just replacing individual buttons. This article will cover widely used methods used to replace mechanical keypads with capacitive touch sensors.

• 170.03 KB
• 01/03/2012