Compass app for micro:bit which shows where's the NORTH. App reads compassHeading value and uses it to determine which LED to turn on. All 360 degrees are divided by 12 (ie. 30 degrees). 12 LEDs around the LED matrix are used to show the NORTH.

compass.txt

let Angle = 0
basic.forever(() => {
    Angle = input.compassHeading()
    if (345 < Angle || Angle < 15) {
        basic.showLeds(`
            . . # . .
            . . . . .
            . . . . .
            . . . . .
            . . . . .
            `)
    } else {
        if (15 < Angle && Angle < 45) {
            basic.showLeds(`
                . # . . .
                . . . . .
                . . . . .
                . . . . .
                . . . . .
                `)
        } else {
            if (45 < Angle && Angle < 75) {
                basic.showLeds(`
                    . . . . .
                    # . . . .
                    . . . . .
                    . . . . .
                    . . . . .
                    `)
            } else {
                if (75 < Angle && Angle < 105) {
                    basic.showLeds(`
                        . . . . .
                        . . . . .
                        # . . . .
                        . . . . .
                        . . . . .
                        `)
                } else {
                    if (105 < Angle && Angle < 135) {
                        basic.showLeds(`
                            . . . . .
                            . . . . .
                            . . . . .
                            # . . . .
                            . . . . .
                            `)
                    } else {
                        if (135 < Angle && Angle < 165) {
                            basic.showLeds(`
                                . . . . .
                                . . . . .
                                . . . . .
                                . . . . .
                                . # . . .
                                `)
                        } else {
                            if (165 < Angle && Angle < 195) {
                                basic.showLeds(`
                                    . . . . .
                                    . . . . .
                                    . . . . .
                                    . . . . .
                                    . . # . .
                                    `)
                            } else {
                                if (195 < Angle && Angle < 225) {
                                    basic.showLeds(`
                                        . . . . .
                                        . . . . .
                                        . . . . .
                                        . . . . .
                                        . . . # .
                                        `)
                                } else {
                                    if (225 < Angle && Angle < 255) {
                                        basic.showLeds(`
                                            . . . . .
                                            . . . . .
                                            . . . . .
                                            . . . . #
                                            . . . . .
                                            `)
                                    } else {
                                        if (255 < Angle && Angle < 285) {
                                            basic.showLeds(`
                                                . . . . .
                                                . . . . .
                                                . . . . #
                                                . . . . .
                                                . . . . .
                                                `)
                                        } else {
                                            if (285 < Angle && Angle < 315) {
                                                basic.showLeds(`
                                                    . . . . .
                                                    . . . . #
                                                    . . . . .
                                                    . . . . .
                                                    . . . . .
                                                    `)
                                            } else {
                                                basic.showLeds(`
                                                    . . . # .
                                                    . . . . .
                                                    . . . . .
                                                    . . . . .
                                                    . . . . .
                                                    `)
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }
    }
})