1: LED lights pulsate regularly with the rhythm of music, pulsing mode

2: Gradient mode

3: Fixed mode

4: Off mode

5: Support custom functions

    With the change of music rhythm, the greater the sound, the greater the brightness of LED, and vice versa. Working principle: use microphone to detect sound, send it to ADC for sampling after op amp processing, and get a sampling value corresponding to sound size. The program processes the sampling value and assigns it directly to the PWM register. In this way, different volume corresponds to different duty cycle. At this time, the LED at the output pin will change with the sound. Then, drive higher power LED. Here, 3W lamp beads are used, and components such as light barrier triode are used.