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 ACS712 sensor, which can accurately detect AC or DC current. The maximum AC or DC that can be detected can reach 20A, and the present current signal can be read via analog I / O port of Arduino.
Supply Voltage: 4.5V~5.5V DC
Measure Current Range: -20A~ 20A
External Link & Download
ACS712 Arduino Programhttp://www•elecrow•com/download/Current%20Senso...
Useful Introduction_1 from embedded-lab.http://embedded-lab•com/blog/?p=4529
Useful Introduction_2 from embedded-lab.http://embedded-lab•com/blog/?p=4469