Capacitive touch buttons can be triggered without actually touching them. When a finger comes within a close proximity to the button it will be triggered. The amount of distance through which the button works depends on the material type and thickness but the distance is small.
This is a great type of button to use for waterproofing, dust-proofing, or aesthetic reasons. It’s also very durable since there is no mechanical button movement.
These buttons have 3 operational modes set by soldering a bridge across jumpers:
- No bridge – High signal when active. Otherwise low.
- A bridge – Low when active. Otherwise high.
- B bridge – Toggles and retains high or low each press.
These buttons can be used with an Arduino. They could also be used on their own and control a larger load using a MOSFET or other transistor.