1.3 KiB
1.3 KiB
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.
The BBC micro:bit measures the light around it by using some of the
LEDs on the LED screen.
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 that can find the light level)
has to be turned on first.
input.lightLevel();
Returns
- a Number that means a light level from
0(dark) to255(bright).
Example: show light level
When you press button B on the microbit, this
program shows the light level
on the LED screen.
input.onButtonPressed(Button.B, () => {
let level = input.lightLevel()
basic.showNumber(level)
})
Example: chart light level
This program shows the light level with a bar chart on the micro:bit screen. If you carry the micro:bit around to different places with different light levels, the bar chart will change.
basic.forever(() => {
led.plotBarGraph(input.lightLevel(), 255)
})