Night light

Step 1

Drag the ||light:set all pixels|| block in the forever loop to set a new color on the LEDs.

forever(function () {
    light.setAll(0x0000ff);
})

Step 2

Drag a ||loops:for|| loop to repeat code 256 times!

Since we start counting at 0, we put 255 as the number of loops.

forever(function () {
    light.setAll(0x0000ff);
    for (let index = 0; index <= 255; index++) {
    }
})

Step 3

Drag a ||light:set brightness|| block and place the ||variables:index|| block from the Variables drawer into the slot.

Index is a variable that changes on every ||loops:for|| iteration. It starts at 0 and goes to 255.

forever(function () {
    light.setAll(0x0000ff);
    for (let index = 0; index <= 255; index++) {
        light.setBrightness(index)
    }
})

Step 4

Drag a ||loops:pause 20 ms|| in the ||loops:for|| to slow down the animation.

Change that value in pause to slow down or speed up the glowing effect!

forever(function () {
    light.setAll(0x0000ff);
    for (let index = 0; index <= 255; index++) {
        light.setBrightness(index)
        pause(20)
    }
})

Step 5

Click |Download| to transfer your code to the Adafruit Circuit Playground Express. It should glow once to full brightness.

Step 6

Duplicate the ||loops:for|| loop under the original for loop.

forever(function () {
    light.setAll(0x0000ff);
    for (let index = 0; index <= 255; index++) {
        light.setBrightness(index)
        pause(20)
    }
    for (let index = 0; index <= 255; index++) {
        light.setBrightness(index)
        pause(20)
    }
})

Step 7

Using a Math block change index to 255 - index in the ||light:set brightness|| block.

forever(function () {
    light.setAll(0x0000ff);
    for (let index = 0; index <= 255; index++) {
        light.setBrightness(index)
        pause(20)
    }
    for (let index = 0; index <= 255; index++) {
        light.setBrightness(255 - index)
        pause(20)
    }
})

Step 8

Click |Download| to transfer your code to the Adafruit Circuit Playground Express. It should glow back and forth.

Step 9

Find materials in your house that diffuse light, like styrofoam and wrap the Adafruit Circuit Playground Express in it. Plug it near your bed and enjoy the light show!