RPi.GPIO library setup in Raspberry Pi - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the purpose of the RPi.GPIO library in Raspberry Pi?

The RPi.GPIO library allows you to control the Raspberry Pi's GPIO pins to interact with electronic components like LEDs, buttons, and sensors.

beginner

How do you import the RPi.GPIO library in a Python script?

You import it using <code>import RPi.GPIO as GPIO</code>. This lets you use the GPIO functions with the short name <code>GPIO</code>.

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What does GPIO.setmode(GPIO.BCM) do?

It sets the pin numbering system to BCM, which means you refer to the GPIO pins by their Broadcom chip numbers.

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Why should you call GPIO.cleanup() at the end of your program?

Calling GPIO.cleanup() resets the GPIO pins to a safe state, preventing issues when you run other programs later.

beginner

How do you set a GPIO pin as an output using RPi.GPIO?

Use GPIO.setup(pin_number, GPIO.OUT) to set a pin as an output so you can control devices like LEDs.

Which command imports the RPi.GPIO library correctly?

A import RPi.GPIO as GPIO

B import gpio

C import Raspberry.GPIO

D import GPIO

The correct import statement is import RPi.GPIO as GPIO to access GPIO functions.

What does GPIO.setmode(GPIO.BCM) specify?

A Set all pins as inputs

B Use physical pin numbers

C Use Broadcom chip pin numbers

D Disable GPIO pins

It sets the pin numbering to Broadcom chip numbers (BCM), not physical pin numbers.

Which function resets GPIO pins to a safe state?

A GPIO.stop()

B GPIO.reset()

C GPIO.close()

D GPIO.cleanup()

GPIO.cleanup() resets pins to avoid conflicts in future programs.

How do you set GPIO pin 17 as an output?

A GPIO.setup(17, GPIO.OUT)

B GPIO.setmode(17, GPIO.OUT)

C GPIO.setup(17, GPIO.IN)

D GPIO.output(17, GPIO.OUT)

Use GPIO.setup(17, GPIO.OUT) to configure pin 17 as output.

Why is it important to call GPIO.cleanup()?

A To start the GPIO pins

B To reset pins and avoid errors

C To install the library

D To import GPIO functions

Calling GPIO.cleanup() resets pins to prevent errors in later use.

Explain the steps to set up the RPi.GPIO library for controlling an LED on a Raspberry Pi.

Think about how you prepare the pins and clean up after.

Why do we choose between BCM and BOARD modes in RPi.GPIO, and what is the difference?

Consider how you identify pins on the Raspberry Pi.