Switch 1 and switch 2 is the motor controller. If we turn on switch 1 and switch 2 will make the motor 1 starts working and keep current flowing into the 7secment and shows the distances coming out through 7 segment. The third switch is a switch that will switch between motors 1 and 2 motors. When Toggle Switch 3 will cause the motor 1 stop working, but the motor 2 will change starts working. When 1 motor is not working, there is don’t current flowing into the 7secment, and is therefore not an issue.