An onboard motor driver chip ULN2003A 2, the chip has drawn all pins for easy connection to use 3, the power supply pins 5-12V 4, on-board four-way signal lights 4, onboard XH-5P socket, can be connected directly 28BYJ-48 models of the stepper motor 5, PCB board size: 40.5 (mm) x21.3 (mm).
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