The understanding of the DIP switch, when each DIP switch is turned to the ON position, it means that it is in a closed state. This switch can be equivalent to a self-locking switch. In the experimental circuit, it is sometimes necessary to use a non-locking switch, that is, press After the button is pressed, the switch is turned on, and the switch is turned off when the hand is released. At this time, it can be used alternatively when applying the DIP switch. First, turn the switch to ON, and then dial it back to simulate the action of the unlocked switch.