Raspberry Pi - LED and Button Projects
Which of the following correctly adds an event detection on GPIO pin 17 for a rising edge with a callback function named button_pressed?
Which of the following correctly adds an event detection on GPIO pin 17 for a rising edge with a callback function named button_pressed?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Identify correct edge
The question asks for rising edge detection.Step 2: Callback syntax
The callback should be passed as a function reference without parentheses or quotes.Step 3: Check options
GPIO.add_event_detect(17, GPIO.RISING, callback=button_pressed) uses GPIO.RISING and passes callback correctly.Final Answer:
GPIO.add_event_detect(17, GPIO.RISING, callback=button_pressed) -> Option BQuick Check:
Callback must be function reference, not call or string [OK]
Quick Trick: Use function name without () for callback [OK]
Common Mistakes:
- Calling the callback function instead of passing it
- Passing callback as a string
- Using wrong edge detection
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