Which edge detection option should you use with GPIO.add_event_detect to detect when a button is pressed (assuming active low button)?

easy📝 Conceptual Q2 of 15

Raspberry Pi - LED and Button Projects

Which edge detection option should you use with GPIO.add_event_detect to detect when a button is pressed (assuming active low button)?

AGPIO.FALLING

BGPIO.RISING

CGPIO.BOTH

DGPIO.NONE

Step-by-Step Solution

Solution:

Step 1: Understand button wiring (active low)
An active low button connects the pin to ground when pressed, causing the signal to go from HIGH to LOW.
Step 2: Choose correct edge detection
Since the signal falls from HIGH to LOW on press, use GPIO.FALLING to detect the press event.
Final Answer:
GPIO.FALLING -> Option A
Quick Check:
Active low button press = FALLING edge [OK]

Quick Trick: Active low button press triggers FALLING edge [OK]

Common Mistakes:

Master "LED and Button Projects" in Raspberry Pi

9 interactive learning modes - each teaches the same concept differently

Want More Practice?

15+ quiz questions · All difficulty levels · Free

More Raspberry Pi Quizzes