Description A module description 1 module is driven by a 9012 transistor 2 Working voltage 3.3V-5V 6 With fixing bolt holes for easy installation 7 Small board PCB size: 3.3cm * 1.3cm Two module interface description (3-wire system) 1 VCC external 3.3V-5V voltage (can be directly connected to 5v single-chip microcomputer and 3.3v single-chip microcomputer) 2 GND external GND 3 I/O external single-chip IO port
