By using conductive yarn as electrodes, you can create a simple button with crochet. The construction idea is very similar to fabric button.
Crochet button with Schoeller Conductive Yarn: Nm 25/1 100% Inox @ Euros 145.00/kg (25,000 metres/kg). The resistance range 100-120 ohm, 30 ohm when stretched per 10 cm.
The button has 1.6k ohm resistance when closed (pushed).
Here are pictures of construction.
The middle pink-white yarn is mixed with conductive yarn. Green and orange yarn are normal yarn. Orange yarn is connecting the 2 sides and closing the button.
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[...] I’ve also been teaching myself to crochet and will be trying out more techniques soon. I made a crochet button using the example on How To Get What You Want. [...]