LI Yuan, LI Bao-ying, MU Yan. Design of Adjustable Brightness LED Automatic Controllable System[J]. , 2011,26(1): 96-99 DOI: 10.3788/YJYXS20112601.0096.
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 LEDs 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 LEDs light intensity of intelligent control.
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references
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