LED

### Lesson Plan: Using an LED with the Raspberry Pi Pico WH

**Introduction**

Hey guys! Today, we’re diving into something super cool and fundamental in the world of electronics: controlling an LED with the Raspberry Pi Pico WH. LEDs are everywhere – from traffic lights to your TV remote – and learning how to use them is an awesome first step into electronics. So, buckle up, because we’re about to light things up!

**Learning Objectives**

By the end of this lesson, you’ll be a pro at connecting an LED to your Raspberry Pi Pico WH and making it blink using MicroPython. This is your gateway to creating more complex and exciting projects. We’re talking light shows, indicators, and much more. Ready to become an LED master? Let’s do this!

**Materials Needed**

Alright, here’s what you’ll need for this adventure: a Raspberry Pi Pico WH, an LED (pick your favorite color), a 330-ohm resistor, a breadboard, some jumper wires, a Micro USB cable, and your trusty computer with a MicroPython IDE. These tools are your ticket to the wonderful world of LED control.

**Background Information**

So, what’s an LED anyway? LED stands for Light Emitting Diode, and it’s a special kind of diode that lights up when current flows through it. It’s polarized, meaning it has a positive leg (anode) and a negative leg (cathode). The longer leg is the anode and connects to the positive voltage, while the shorter leg is the cathode and goes to ground. We’ll also use a resistor to keep our LED safe from too much current. Got it? Great!

**Circuit Diagram**

Before we dive into the build, let’s get a mental picture of our circuit. We’ll place the LED on the breadboard, connect the anode to one of the Raspberry Pi Pico’s GPIO pins (let’s go with GP15), and the cathode to a resistor that then goes to ground. It’s simple, but it’s going to be awesome.

**Step-by-Step Instructions**

Let’s get our hands dirty! Start by placing your LED on the breadboard. Remember, the longer leg (anode) should go to the GPIO pin. Use a jumper wire to connect the anode to GP15 on the Raspberry Pi Pico. Now, connect the shorter leg (cathode) to one end of the 330-ohm resistor. The other end of the resistor goes to the ground rail on your breadboard. Finally, use another jumper wire to connect the ground rail to one of the ground pins on the Raspberry Pi Pico. Boom, you’ve built your circuit!

Next, connect the Raspberry Pi Pico to your computer with the Micro USB cable. Fire up your MicroPython IDE and get ready to code.

**Sample Code**

Here’s where the magic happens. Copy and paste this code into your IDE and upload it to the Raspberry Pi Pico WH.

“`python
from machine import Pin
from time import sleep

led = Pin(15, Pin.OUT)

while True:
led.on()
sleep(1)
led.off()
sleep(1)
“`

What’s happening here? We’re importing the necessary modules, setting up the LED pin, and then creating a loop that turns the LED on and off with a one-second delay. Simple, but oh so satisfying.

**Testing and Troubleshooting**

Hit upload and watch your LED blink to life! If it’s not working, don’t panic. Double-check your connections. Make sure the anode and cathode are correctly placed, and that everything is snug. Verify that the code is correctly uploaded to the Raspberry Pi Pico WH. Still having issues? Take a deep breath and try again. You got this!

**Applications and Extensions**

Now that you’ve got the basics down, let’s get creative. Try changing the delay in the `sleep()` function to make the LED blink faster or slower. Add more LEDs and create cool patterns. The sky’s the limit!

**Summary and Review**

Congratulations! You’ve just mastered the basics of controlling an LED with the Raspberry Pi Pico WH and MicroPython. You learned about LED polarity, the importance of resistors, and how to code a simple blink program. These skills are the building blocks for countless amazing projects. Keep experimenting, and most importantly, have fun!

Remember, the best way to learn is by doing, so keep building, keep coding, and keep exploring the incredible world of electronics. Happy tinkering!

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