Raspberry Pi - GPIO Basics with Python
You want to detect a button press on pin 5 and print "Pressed" only once per press, ignoring bouncing. Which approach using GPIO.input is best?
You want to detect a button press on pin 5 and print "Pressed" only once per press, ignoring bouncing. Which approach using GPIO.input is best?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand button bouncing
Button presses cause rapid on/off signals (bouncing) that need filtering.Step 2: Use loop with delay and state change detection
Polling GPIO.input with delay and checking for change avoids multiple prints.Final Answer:
Use GPIO.input(5) in a loop with a short delay and check for state change -> Option AQuick Check:
Detect state change with delay to avoid bounce noise [OK]
Quick Trick: Detect state change with delay to avoid bounce [OK]
Common Mistakes:
- Printing continuously while pressed
- Setting input pin as output
- Ignoring bouncing effect
- Reading pin without delay
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