Setting pin mode (IN, OUT) in Raspberry Pi - Mini Project: Build & Apply

Setting pin mode (IN, OUT)

📖 Scenario: You have a Raspberry Pi and want to control an LED and read a button press. To do this, you need to set the pins to the right mode: input for the button and output for the LED.

🎯 Goal: Learn how to set the pin mode to IN or OUT using the Raspberry Pi GPIO library.

📋 What You'll Learn

Use the RPi.GPIO library

Set pin 18 as output for an LED

Set pin 23 as input for a button

💡 Why This Matters

🌍 Real World

Setting pin modes is essential when connecting sensors, buttons, and LEDs to a Raspberry Pi for home automation or robotics projects.

💼 Career

Understanding GPIO pin modes is important for hardware interfacing roles, embedded systems programming, and IoT development.

1

Import GPIO and set pin numbering mode

Write code to import the RPi.GPIO library as GPIO and set the pin numbering mode to GPIO.BCM.

Raspberry Pi

# Import RPi.GPIO as GPIO and set GPIO mode to BCM
# Your code here

Need a hint?

Use import RPi.GPIO as GPIO and then GPIO.setmode(GPIO.BCM) to set the pin numbering.

2

Set pin 18 as output and pin 23 as input

Write code to set pin 18 as an output pin and pin 23 as an input pin using GPIO.setup().

Raspberry Pi

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
# Set pin 18 as output and pin 23 as input
# Your code here

Need a hint?

Use GPIO.setup(18, GPIO.OUT) to set pin 18 as output and GPIO.setup(23, GPIO.IN) to set pin 23 as input.

3

Turn on the LED connected to pin 18

Write code to turn on the LED by setting pin 18 to GPIO.HIGH using GPIO.output().

Raspberry Pi

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
GPIO.setup(23, GPIO.IN)
# Turn on the LED on pin 18
# Your code here

Need a hint?

Use GPIO.output(18, GPIO.HIGH) to turn on the LED connected to pin 18.

4

Print the mode of pins 18 and 23

Write code to print the mode of pin 18 and pin 23 using GPIO.gpio_function(). The output should be exactly:
Pin 18 mode: OUT
Pin 23 mode: IN

Raspberry Pi

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.OUT)
GPIO.setup(23, GPIO.IN)
GPIO.output(18, GPIO.HIGH)
# Print the mode of pin 18 and pin 23
# Your code here

Need a hint?

Use GPIO.gpio_function(pin) to get the mode, then print the mode names IN or OUT accordingly.