The electronic lucky wheel achieves the same function electronically. This kit configures 10 LEDs into a circle. When the button is pressed, each LED turns light in turn, and the flow speed becomes slower and slower, and finally stops at a certain one. No more movement on the LED. If the last LED that lights up is the same as the player predicted, it means "winning". The pulse generator is composed of NE555 and peripheral components to form a multivibrator. When the button S1 is pressed, Q1 is turned on, and the 3-pin of NE555 outputs a pulse, then the 10 output terminals of the CD4017 output high level in turn to drive 10 LEDs to emit light in turn. After releasing the button, due to the existence of capacitor C1, Q1 will not be turned off immediately. With the decrease of the voltage across C1, the conduction process of Q1 gradually weakens, the frequency of the output pulse at pin 3 becomes slower, and the LED moving frequency also follows. slow down. Finally when the discharge of C1 ends. When Q1 ends, the 3-pin of NE555 no longer outputs pulses, and the LED stops moving. A "draw" process is thus completed. R2 decides the LED moving speed, and C1 decides the time to wait for the "draw".