The electronic hourglass circuit is The movement process of the ancient hourglass timing is simulated by using the on and off of the LED. The whole design uses the CD4015 shift register as the main control chip, uses the chip CD4069 gate circuit to form a multivibrator to generate the clock signal, and represents the sand grains through the LED image to simulate the movement process of the hourglass. The electronic LED will be like a real hourglass. The 15 LEDs located in the upper inverted triangle are all bright (simulating sand filling the container), and when one is turned off, there will be an LED in the lower triangle and the corresponding position (simulating the lower part of the hourglass). Grains of sand are piled up one by one). Until finally the upper LEDs are all turned off, the lower LEDs are all on, then the lower LEDs are all turned off, and the upper LEDs are all on, and the above process is repeated.