[Solved] What happens when you use GPIO.add_event_detect on a Raspberry Pi GPIO pin connected to a button? — Ans: It monitors the pin for specified edge changes and triggers a callback if set | Raspberry Pi

Raspberry Pi - LED and Button Projects

What happens when you use GPIO.add_event_detect on a Raspberry Pi GPIO pin connected to a button?

AIt disables the pin to save power

BIt continuously reads the pin state in a loop

CIt monitors the pin for specified edge changes and triggers a callback if set

DIt sets the pin as an output to control an LED

Step-by-Step Solution

Solution:

Step 1: Understand GPIO.add_event_detect
This function sets up an interrupt to detect changes on a GPIO pin.
Step 2: Effect on button input
When a button is connected, it detects edges (rising/falling) and can call a callback function.
Final Answer:
It monitors the pin for specified edge changes and triggers a callback if set -> Option C
Quick Check:
Interrupts detect edges, not continuous reads [OK]

Quick Trick: add_event_detect sets interrupt on pin edges [OK]

Common Mistakes:

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What happens when you use GPIO.add_event_detect on a Raspberry Pi GPIO pin connected to a button?