Forever
Keep running part of a program in the background.
basic.forever(() => {
})
Example: compass
The following example constantly checks the compass heading and updates the screen with the direction.
let degrees = 0
basic.forever(() => {
degrees = input.compassHeading()
if (degrees < 45) {
basic.showString("N")
} else if (degrees < 135) {
basic.showString("E")
} else if (degrees < 225) {
basic.showString("S")
} else if (degrees < 315) {
basic.showString("W")
} else {
basic.showString("N")
}
})
Example: counter
The following example keeps showing the number stored in a global variable.
When you press button A
, the number gets bigger.
You can use a program like this to count things with your micro:bit.
let num = 0
basic.forever(() => {
basic.showNumber(num)
})
input.onButtonPressed(Button.A, () => {
num = num + 1
})
Competing for the LED screen
If different parts of a program are each trying to show something on the LED screen at the same time, you may get unexpected results. Try this on your micro:bit:
basic.forever(() => {
basic.showNumber(6789)
})
input.onButtonPressed(Button.A, () => {
basic.showNumber(2)
})