Mechanical and prone to failure, switches can seem quaint these days. Plus, everyone is used to having touch screens on their phones and other devices. So why not use touch ….
Getting to Know the TP223 Capacitive Touch Sensor. So why not use touch sensors on your next project. [Tarantula3] has details on using the TP223 instead of ordinary switches.
These inexpensive modules work through plastic, glass, or wood, opening up many interesting possibilities for building a front panel. Of course, the thicker the surface above the module, the less sensitive the switch is, but that’s not always a bad thing. In particular, you may want to reduce sensitivity anyway.
Thicker panels, reducing the size of the touch pad, or adding an external capacitor can reduce the sensor’s range.
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