[Solved] Examine this Flask route intended to toggle GPIO pin 22:@app.route('/flip')def flip_pin(): current_state = GPIO.input(22) GPIO.... | Raspberry Pi

Raspberry Pi - Web Server and API

Examine this Flask route intended to toggle GPIO pin 22:

@app.route('/flip')
def flip_pin():
    current_state = GPIO.input(22)
    GPIO.output(22, not current_state)
    return 'Pin toggled'

What is the main issue with this code?

AGPIO.output cannot accept boolean values

BThe route decorator syntax is incorrect

CGPIO.input(22) may not be set up as input, causing an error

DThe function lacks a return statement

Step-by-Step Solution

Solution:

Step 1: Check GPIO setup
GPIO pin 22 must be configured as input or output before reading or writing.
Step 2: Identify missing setup
If GPIO.setup(22, GPIO.OUT) is missing, GPIO.input(22) will cause an error.
Step 3: Confirm other code parts
Route decorator and return statement are correct; GPIO.output accepts boolean values.
Final Answer:
GPIO.input(22) may not be set up as input, causing an error -> Option C
Quick Check:
GPIO pins must be set up before input/output [OK]

Quick Trick: Always setup GPIO pins before reading or writing [OK]

Common Mistakes:

MISTAKES

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Examine this Flask route intended to toggle GPIO pin 22: