PWMLED for brightness in Raspberry Pi - Mini Project: Build & Apply

PWMLED for brightness

📖 Scenario: You have a Raspberry Pi connected to an LED through a PWM pin. You want to control the brightness of the LED by changing the PWM duty cycle.

🎯 Goal: Build a simple program that sets up a PWM LED on pin 18 and changes its brightness by setting the PWM value.

📋 What You'll Learn

Create a PWMLED object on pin 18

Set a brightness level variable

Use the brightness variable to set the LED brightness

Print the brightness value

💡 Why This Matters

🌍 Real World

Controlling LED brightness is common in home automation, indicators, and lighting projects using Raspberry Pi.

💼 Career

Understanding PWM control of LEDs is useful for hardware interfacing and embedded systems programming.

1

Set up the PWMLED on pin 18

Import PWMLED from gpiozero and create a PWMLED object called led on pin 18.

Raspberry Pi

# Your code here

Need a hint?

Use from gpiozero import PWMLED to import the class.

Create the LED with led = PWMLED(18).

2

Create a brightness variable

Create a variable called brightness and set it to 0.5 to represent half brightness.

Raspberry Pi

from gpiozero import PWMLED
led = PWMLED(18)
# Your code here

Need a hint?

Set brightness = 0.5 to represent 50% brightness.

3

Set the LED brightness using the brightness variable

Set the value property of led to the brightness variable.

Raspberry Pi

from gpiozero import PWMLED
led = PWMLED(18)
brightness = 0.5
# Your code here

Need a hint?

Use led.value = brightness to set the LED brightness.

4

Print the brightness value

Print the text "Brightness level:" followed by the brightness variable.

Raspberry Pi

from gpiozero import PWMLED
led = PWMLED(18)
brightness = 0.5
led.value = brightness
# Your code here

Need a hint?

Use print(f"Brightness level: {brightness}") to show the brightness.