private void onHighLight(object sender, HighLightArgs e)
{
lightsensor ls = (lightsensor)sender;
Console.WriteLine("high-light alert");
Console.WriteLine("light level: " + e.level);
}
public void on()
{
lightS = new lightsensor("light sensor", 50, 20, 70);
proximityS = new proximitysensor("proximity sensor", 100, 20);
statusChanged += itemStatusChanged;
toggle();
}