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Lesson 01: Button Module

In this lesson, you will learn how to use Raspberry Pi Pico W to interact with the onboard LED using a button. Pressing the button will light up the LED, and releasing the button will turn it off. This project is ideal for beginners as it offers hands-on experience with input and output operations on Raspberry Pi Pico W using MicroPython.

Required Components

In this project, we need the following components.

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Universal Maker Sensor Kit	94	Universal Maker Sensor Kit

You can also buy them separately from the links below.

Component Introduction	Purchase Link
Raspberry Pi Pico W	BUY
Button Module	-
Breadboard	BUY

Wiring

Code

from machine import Pin
import time

# Set GPIO 19 as an input pin to read the button state
button = Pin(19, Pin.IN)

# Initialize the onboard LED of the Raspberry Pi Pico W
led = Pin('LED', Pin.OUT)

while True:
    if button.value() == 0:  # Check if the button is pressed
        led.value(1)  # Turn on the LED
    else:
        led.value(0)  # Turn off the LED

    time.sleep(0.1)  # Short delay to reduce CPU usage

Code Analysis

Importing Modules

The machine module is imported to interact with the GPIO pins, and the time module is for handling timing.
```
from machine import Pin
import time
```
Setting up the Button

GPIO 19 is configured as an input pin. This will read the state of the push button connected to it.
```
button = Pin(19, Pin.IN)
```
Setting up the LED

The onboard LED is set up as an output pin, enabling us to turn it on or off programmatically.
```
led = Pin('LED', Pin.OUT)
```
Main Loop
- An infinite loop is used to continuously check the state of the button.
- If the button is pressed (button.value() == 0), the LED is turned on. Otherwise, it’s turned off.
- A short delay of 0.1 seconds is added to reduce CPU usage.
The button module used in this project has an internal pull-up resistor (see its schematic diagram), causing the button to be at a low level when pressed and remain at a high level when released.
```
while True:
    if button.value() == 0:  # Check if the button is pressed
        led.value(1)  # Turn on the LED
    else:
        led.value(0)  # Turn off the LED
    time.sleep(0.1)  # Short delay to reduce CPU usage
```