Raspberry Pi - LED and Button Projects
Which of the following Python code snippets correctly sets up GPIO pin 18 as an output for an LED in a reaction time game?
Which of the following Python code snippets correctly sets up GPIO pin 18 as an output for an LED in a reaction time game?
easy📝 Syntax Q3 of 15
Step-by-Step Solution
Solution:
Step 1: Recall GPIO setup syntax
To set a pin as output, useGPIO.setup(pin_number, GPIO.OUT).Step 2: Check each option
GPIO.setup(18, GPIO.OUT) correctly sets pin 18 as output. GPIO.setup(18, GPIO.IN) sets it as input, which is wrong for LED. Options A and D misuse GPIO.output and GPIO.input functions.Final Answer:
GPIO.setup(18, GPIO.OUT) -> Option BQuick Check:
GPIO output setup = GPIO.setup(pin, GPIO.OUT) [OK]
Quick Trick: Use GPIO.setup(pin, GPIO.OUT) to set output pins [OK]
Common Mistakes:
- Using GPIO.IN for output pins
- Calling GPIO.output() instead of GPIO.setup() to configure pins
- Mixing GPIO.input() and GPIO.output() functions
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