The ACS712 Current Sensor Module 20A consists of a precise, low-offset, linear Hall circuit with a copper conduction path located near the surface of the die. Applied current flowing through this copper conduction path generates a magnetic field which the Hall IC converts into a proportional voltage. 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. 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. Package Includes : 1 x ACS712 Current Sensor Module 20A
