Practice: GPIO & Circuit Challenges

Relax. We'll talk through this in plain words — no textbook voice.

What you'll walk away with

Get comfortable with Practice: GPIO & Circuit Challenges, no intimidation required
Be able to wire the hardware and run the code yourself
Apply this concept right away in a real project

Let's think about this for a second

This practice set isn't about new concepts — it's designed to help you re-practice LED wiring, GPIO control, and button input concepts through 3 hands-on tasks.

Let's connect this to a real-world scenario

3 tasks: (1) Traffic Light Simulator — wire up 3 LEDs (red, yellow, green) and write a Python script that auto-cycles them through a sequence (red→green→yellow→red); (2) Button-Controlled LED Brightness — use PWM (gpiozero's PWMLED class) to step up the LED's brightness level each time a button is pressed; (3) Reaction Time Game — combine a button press and an LED into a mini-game that measures how long it takes from the LED lighting up to the button being pressed.

Task 1: Traffic Light Simulator (3-LED sequence)
Task 2: LED brightness step control with PWM
Task 3: Reaction Time Game (button + timer)

Let's walk through it together

python

# Task 1 starter — traffic light sequence skeleton
from gpiozero import LED
from time import sleep

red, yellow, green = LED(17), LED(27), LED(22)

while True:
    red.on(); sleep(3); red.off()
    green.on(); sleep(3); green.off()
    yellow.on(); sleep(1); yellow.off()

You should see

You'll finish with a runnable Python script/circuit for all 3 tasks.

5-Minute Try-It

Work through the 3 tasks yourself, in order — if you don't have LEDs/wiring resources on hand, just writing out the code logic still counts as learning.

A quick word of caution

Even without a physical LED/circuit yet, write out the code logic yourself — getting comfortable with the logic ahead of time saves you time once you actually have the hardware and just need to handle the wiring.

Easy traps

In Task 1, not double-checking that the pin numbers for the 3 LEDs match between the wiring diagram and the code
In Task 2, not realizing you need to use the PWMLED class instead of the LED class (since brightness control requires PWM capability)

Now try it yourself

Work through the 3 tasks yourself, in order — if you don't have LEDs/wiring resources on hand, just writing out the code logic still counts as learning.

You'll know it worked when: You'll finish with a runnable Python script/circuit for all 3 tasks.