With the development of fast-paced life in today’s society，contemporary students increasingly ignore the importance of time management． They spend a lot of time in the fragmented entertainment that originally planned to watch only a few videos and play only a few games，which has a huge impact on their original study and life． To more effectively reflect the passage of time，the electronic hourglass circuit is specially designed to simulate the fall of sand in the hourglass by controlling the light beads．The electronic hourglass circuit simulates 30 seconds of normal hourglass dropping at non-hourglass time to remind people of the value of time．To cherish fragmented time，make a short time backtrack at the whole time，lower sand grains fall back to the upper hourglass again，and play a song and change the color of the lamp beads．This process is the same as 30 seconds，to remind people that time never goes back，people should pay attention to time management and make good use of time．