Description: The ACS712 sensor employs the Hall effect to measure current. The Hall effect is a concept in physics where a magnetic field influences the motion of electrons in a conductor, resulting in a measurable voltage across the conductor. In the ACS712, this principle is used to provide a proportional voltage output corresponding to the current passing through the sensor. The sensor gives accurate measurement of current in both AC and DC circuits, which allows it to monitor power consumption.  The sensor has three pins VCC, GND and OUT which gives an easy connection with microcontrollers. Specification: Current sensor chip: ACS712TELC-20A Operating Voltage (V) : 4.5V ~ 5.5V DC Measure Current Range: -20~ 20A Sensitivity: 100mV/A Length (mm): 32 Width (mm): 13 Height (mm): 13.5 Weight (gm): 5 Package Includes: 1 x ACS712 20AMP AC/DC Current Sensor