An automatic dimming method based on single chip microcomputer

Abstract

The invention discloses an automatic dimming method based on a single chip microcomputer, which comprises the following steps: step 1, according to a detection range of a light intensity sensor, setting a unit PWM output quantity; 2, obtain that current illumination intensity value by the light intensity sensor; 3, comparing the current light intensity value with a preset light intensity thresholdvalue; Step 4, when the current illumination intensity value is greater than the light intensity threshold value, the PWM output of the single-chip microcomputer increases a unit PWM output quantity,and when the current illumination intensity value is less than the light intensity threshold value, the PWM output of the single-chip microcomputer decreases a unit PWM output quantity. The method collects and compares the illumination intensity of the current light source, and dynamically adjusts the light source, so that the light source tends to be stable. The method can be used in the field of dimming technology.

Description

technical field [0001] The invention relates to the technical field of dimming, in particular to a dimming method. Background technique [0002] Today's lighting systems have a certain degree of automation, but there is a certain distance in terms of fine control functions, such as street lights, the rough brightness of the scene is obtained through the photoresistor, and the photoresistor has a large resistance during the day so that the current through the relay is small , the relay cannot be driven to close the street lamp circuit, the resistance decreases at night and the passing current is large, so that the relay is driven, and the street lamp circuit is closed to achieve the purpose of switching on and off the street lamp switch, but it can only be automatically turned on when it is dark, and it can only be turned on automatically when it is dark. Automatic shutdown, only a rough control can be performed, and complex brightness adjustments cannot be performed, making ...

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Problems solved by technology

[0002] Today's lighting systems have a certain degree of automation, but there is a certain distance in terms of fine control functions, such as street lights, the rough brightness of the scene is obtained through the photoresistor, and the photoresistor has a large resistance during the day so that the current through the relay is small , the relay cannot be driven to close the street lamp circuit, the resistance decreases at night and the passing current is large, so that the relay is driven, and the street lamp circuit is closed to achieve the purpose of switching on and off the street lamp switch, but it can only be automatically turned on when it is dark, and it can only be turned on automatically when it is dark. Automatic shutdown, only a rough control can be performed, and complex brightness adjustments cannot be performed, making the light source unstable

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