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ACS712-5A Current Sensor is used to measured the intensity of current. It contains ACS712ELC-5B chip ,based on Hall Effect. You should protect it from influence of magnetic field when using it.
2.5V Power Supply and Power Indicator On-board
3.This module can detect 5A positive and negative current,corresponding analog output at 185mV/A.
Output voltage is VCC/2 without current flowing.