Raspberry Pi - Automation and Scheduling
What will be the output of this Python code controlling a relay on GPIO pin 23?
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(23, GPIO.OUT)
GPIO.output(23, GPIO.HIGH)
print(GPIO.input(23))
What will be the output of this Python code controlling a relay on GPIO pin 23? import RPi.GPIO as GPIO GPIO.setmode(GPIO.BCM) GPIO.setup(23, GPIO.OUT) GPIO.output(23, GPIO.HIGH) print(GPIO.input(23))
medium📝 Predict Output Q4 of 15
Step-by-Step Solution
Solution:
Step 1: Understand GPIO.output and GPIO.input behavior
Setting GPIO.output(23, GPIO.HIGH) sets pin 23 to high voltage (logical 1).Step 2: Reading pin state with GPIO.input
GPIO.input(23) returns the current state of the pin, which is 1 after setting it high.Final Answer:
1 -> Option CQuick Check:
GPIO.input after GPIO.output HIGH = 1 [OK]
Quick Trick: GPIO.input reads pin state even if set as output [OK]
Common Mistakes:
MISTAKES- Expecting 0 after setting HIGH
- Thinking GPIO.input causes error
- Confusing GPIO.HIGH with integer
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