1, current sensor chips: ACS712ELC-05B; 2, pin 5V power supply, on-board power indicator; 3, the module can be measured plus or minus 5 amps, corresponding to the analog output of 185 mV / A; 4, there is no the detection current through, the output voltage is VCC / 2; 5, PCB board size: 31 (mm) x13 (mm); 1, current sensor chip: ACS712ELC-20A; 2, pin 5V power supply, on-board power indicator; 3, the module can measure the positive and negative 20 amps, corresponding to the analog output 100mV / A; 4, there is no the detection current through, the output voltage is VCC / 2; 5, PCB board size: 31 (mm) x13 (mm); 1.current sensor chips: ACS712ELC-30A; 2.Pin 5V power supply, on-board power indicator; 3.The module can measure the positive and negative 30 amps, corresponding to the analog output 66mV / A; 4.No test current through the output voltage is VCC / 2; 5, PCB board size: 31 (mm) x13 (mm);