The invention relates to an indoor automatic dimming
system matched with the action of a
projector and a dimming method thereof, belonging to the technical field of
automatic control. The
system comprises a singlechip, and a photo-gate, a photosensitive sensor, a limit sensor, a step motor and a
relay which are respectively connected with the singlechip, as well as a power supply, wherein the photo-gate is connected with a driving mechanism of a
projector curtain, the photosensitive sensor is installed on an indoor wall nearby the curtain, the limit sensor is connected with the step motor for driving the curtain to open and close, and the singlechip is further connected with the
relay of a lighting lamp. According to the method, when the singlechip senses falling of the
projector curtain, the photosensitive sensor detects indoor
light intensity; if the light is weak, a projector is suitable for being used, otherwise, the projector is not used; and if the light is strong, the front row of lamp is turned off and the step motor is driven to close the curtain, so that the indoor light is weak. The
system and the method can realize intelligent linkage between the indoor brightness and the projector, effectively reduce manpower and improve the efficiency. The system is a practical system with strong comprehensiveness.