Raspberry Pi - LED and Button Projects
You want to detect a button press on GPIO 23 and execute a function only once per press, avoiding multiple triggers due to button bounce. Which approach is best?
You want to detect a button press on GPIO 23 and execute a function only once per press, avoiding multiple triggers due to button bounce. Which approach is best?
hard📝 Application Q8 of 15
Step-by-Step Solution
Solution:
Step 1: Understand button bounce problem
Button bounce causes multiple rapid signals on press, triggering multiple events.Step 2: Identify debounce solution
GPIO.add_event_detect supports debounce time to ignore rapid repeated signals.Step 3: Evaluate options
Use GPIO.add_event_detect with debounce time parameter uses event detection with debounce, best for single trigger per press.Final Answer:
Use GPIO.add_event_detect with debounce time parameter -> Option DQuick Check:
Debounce with event detect avoids multiple triggers [OK]
Quick Trick: Use event detect with debounce for clean button press [OK]
Common Mistakes:
- Polling in loop causes CPU waste and multiple triggers
- Ignoring debounce causes multiple events
- Trying to read output pin for input
Master "LED and Button Projects" in Raspberry Pi
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