Chip: LM393 WCS2702 Operating voltage: DC 5V 1 Having a signal output indication; 2 Current detection range: DC +/-2A AC: 1.4A; 3 Current detectable resolution: 1V / A; 4 With output over current protection signal indication; 5 Over-current signal setting point is adjustable; set resolution: 0.1A; 6 With belt mounting hole to facilitate firmware installation; 7 Sampling current conversion analog signal output can be connected to ADC; TTL level signal the output can be connected to microcontroller IO port control. 8 The output signal is: simulation signal and the switch quantity signal. With over current detection short protection and teaching demonstration convenient for secondary development