Universal wet contact input and output circuit

The utility model discloses a general wet contact input and output circuit, which comprises a triode, a diode, an MOS (Metal Oxide Semiconductor) tube, a resistor, a power supply input end VIN, an external end VOUT and an interface control end GPIO (General Purpose Input/Output). According to the general wet contact input and output circuit, used components are simple, special components are not needed, the formed circuit is clear in logic and small in occupied area, the general wet contact input and output circuit can be used as a switching value input circuit and a switching value output circuit, one circuit has two purposes, the use flexibility is greatly improved, and the general wet contact input and output circuit is suitable for popularization and application. When the same number of switching value input circuits and switching value output circuits are designed, the design number of the switching value input and output circuits and the usage amount of IO ports of the controller can be halved, the occu