Introduction - If you have any usage issues, please Google them yourself
1 , 8 LED are displayed by water flow, that is, LED1 is bright, other LED is destroyed; then LED2 is bright, other LED is eliminated, and so on. Repeat the above operation.
2, when LED2, LED4, LED6, LED8 bright, buzzer sound; otherwise buzzer does not sound.
3, detect the KEY1 button, if KEY1 press, the current LED, buzzer operating state remains unchanged; otherwise, continue to implement 1, 2 control strategy.