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

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!

night light glow