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In our daily life, blind people also need to use light. They need to remind someone of their coming with lights or turn on the lights for others, but they don't know when to turn on and off. This problem can be easily solved by Photoswitch .Photoswitch consists of light-sensitive component and rolling switch . When the indoor brightness reach the point which tells it's time to turn on the lights, photoswitch can control lights to turn on automatically. Otherwise, the light will be turned off. The rolling switch is used to decide whether the automatic switch system of the light-sensitive switch work or not.