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basic.forever(function () {
    let lightLevel = input.lightLevel();
    if (lightLevel <= 2) {
        // 一定の暗さになったら腕を回す
        basic.showIcon(IconNames.Heart);
        servos.P0.setAngle(180);
        basic.pause(2000);
        servos.P0.setAngle(90);
    }
})