microbit security

let secureState = 0
basic.forever(function () {
    while (secureState == 0) {
        if (input.buttonIsPressed(Button.A)) {
            secureState = 1
        }
    }
    while (secureState == 1) {
        if (input.buttonIsPressed(Button.B)) {``
            secureState = 0
        }
        if (pins.analogReadPin(AnalogPin.P1) > 900) {
            basic.showLeds(`
                # . . . #
                . # . # .
                . . # . .
                . # . # .
                # . . . #
                `)
            basic.forever(function () {
                music.ringTone(Note.C)
            })
        } else { }
    }
})