The module specification
	1 size: 2.7 cm * 1.4 mm 2 main chip: LM393, 3144 hall sensors
	3 working voltage: dc 5 v
	
	Module interface specification (4 wire)
	1 an external 5 v voltage VCC 2 GND external GND3 DO small plate digital output interface (0 and 1)
	
	The module features:
	1 has a power light and signal output instructions.
	2 single-channel signal output.
	3 no trigger module, the output low level;Module has triggered, the output high level.
	4 adjustable sensitivity (fine adjustment).
	5 the magnetic field cutting is the signal output.
	6 switch output circuit board, can be directly by single chip microcomputer or our relay module, buzzer module, etc.7 can be used
	for motor speed/position detection, etc..5*10mm