Active vs Resting States
Did You Know? Active vs. Resting, Pull-down vs. Pull-Up
When this pushbutton is pressed, it is in its active state. If you think of GND as a “low” voltage, and 3.3 V as a “high” voltage, a pushbutton that sends a 3.3 V high signal when you press it is considered active high. When a pushbutton is not pressed it is in a 0 V, low resting state.