Sensing and controlling current flow is a fundamental requirement in a wide variety of applications, including over-current protection circuits, battery chargers, switching mode power supplies, digital watt meters, programmable current sources, etc. This ACS721 current module is based on the ACS712 sensor, which can accurately detect AC or DC current. The maximum AC or DC that can be detected can reach 20 A, and the present current signal can be read via the analog I/O port of the Arduino.

Specifications: 

• Supply Voltage: 4.5V~5.5V DC
• Measure Current Range: -20A~ 20A
• Sensitivity: 100mV/A