Reference

This article explains the principles of controlling LED light strips, focusing on the use of transistor switches and 5V power supply for brightness adjustment via analog and digital signals.

Principle

This LED Light strip(fixed color) is composed of a series of LEDs. It supports 5V power supply and adopts transistor switch. Input high to turn on LED strip and low to turn off it. The brightness of the strip can be adjusted via the analog signal. The larger the input signal, the brighter the LED strip.

Other Supplementary Information

Control the LED strip by digital signal: input high, LED strip lights up; input low, it turns off.

Control the LED strip by analog signal: the larger the input signal, the brighter the LED strip; the smaller the signal, the dimmer the LED strip.

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