light Level

Find the light level (how bright or dark it is) where you are. The light level 0 means darkness and 255 means bright light.

input.lightLevel();

The first time you use it, this function will say 0. After that, it will say the real light level. This is because the light sensor (the part on the board that looks for light) has to be turned on first.

Returns

• a number that is a light level from 0 (dark) to 255 (bright).

Examples

Show light level

When you press button A on the Adafruit Circuit Playground Express, this program changes the brightness of the pixels accordingly.

let pixels = light.createStrip();

input.buttonA.onEvent(ButtonEvent.Click, function() {
    let level = input.lightLevel();
    pixels.setBrightness(level);
    pixels.setAll(0xff0000);
});

Chart light level

This program shows the light level with a graph on the Adafruit Circuit Playground Express with the LEDs. If you carry the Adafruit Circuit Playground Express around to different places with different light levels, the graph will change.

let pixels = light.createStrip();

forever(function() {
    pixels.graph(
        input.lightLevel(),
        0
    );
});

See also

acceleration