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Learn how invisible electric fields detect your finger's presence without any physical pressure
Preview · progress not saved — Chapter 1 is free
Educational content slides
All matter creates tiny electric fields around itself—like invisible force bubbles.
Your finger has one. The touchscreen has one.
When they get close enough, these fields interact and distort each other.
This distortion is what the touchscreen detects. No pressure needed!
Test your understanding with this quiz.
Why doesn't hovering your finger 2 inches above the screen trigger a touch?
Complete this exercise and get AI-powered feedback.
Capacitive sensing can detect more than just on/off touch—it can sense proximity. How would you use this?
Think about: Interfaces where hover preview, analog distance input, or gesture detection would add value.