Abstract
Based on the characteristics of low-power MSP430 MCU,the paper proposes an idea that constant current source control the brightness of LED.In a specified time,MCU selects the brightness of LED's demand by collecting the background light and detecting the infrared signal of human,writes the number of output voltage in D/A converter.And the output voltage by D/A is the input voltage of constant current source which control the voltage of transistor base pole indirectly and lets it produce different output current value.Then the system can accomplish adjustable brightness of LED through the number and finally complete LED's light intensity of intelligent control.
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