pxt-calliope/docs/reference/js/lessons/night-light/challenges.md

night light challenges

Coding challenges for the night light tutorial. #docs

Before we get started

Complete the following guided tutorial:

• tutorial

At the end of the tutorial, click keep editing. Your code should look like this:

led.setBrightness(255)
led.plotAll()
input.onButtonPressed("A", () => {
    led.setBrightness(64)
})

Challenge 1

@video td/videos/night-light-2

What if we want to turn off all the LEDs? Let's do this by setting the brightness to 0 when button B is pressed. Add an event handler with input->on button pressed(B) add led->set brightness(0) to turn off the LEDs.

led.setBrightness(255)
led.plotAll()
input.onButtonPressed("A", () => {
    led.setBrightness(64)
})
input.onButtonPressed("B", () => {
    led.setBrightness(0) // ***
}) // ***

Challenge 3

Add an event handler with input->on screen up to change the LED brightness back to a 255.

• Run main your script to see the LEDs change brightness.