Introduction - If you have any usage issues, please Google them yourself
Based on 51 microcontroller electronic clock, can be modified by EC11 rotary encoder time, LCD1602 display time.
The clock accuracy can be adjusted by the initial value of T0 timer, but to achieve the high precision crystal oscillator is very large, this procedure is only rough conduct electronic clock simulation, if you want to achieve high precision or to use other external modules to cooperate.