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
