ACS712-20A Current sensor

ACS712-20A Current Sensor Module The ACS712-20A Current Sensor Module is a compact and easy-to-use Hall-effect current sensing module designed to measure both AC and DC current. It can measure currents from -20A to +20A and provides an analog voltage output that can be directly interfaced with Arduino, ESP32, Raspberry Pi ADC modules, and other microcontroller-based systems. The module uses the ACS712 Hall-effect current sensor IC, which provides electrical isolation between the current-carrying conductor and the signal/output circuitry. This makes it suitable for a wide range of current monitoring and measurement applications. At zero current, the sensor output is approximately 2.5V when powered from 5V. The output voltage increases or decreases depending on the direction and magnitude of the current. The 20A version has a typical sensitivity of 100mV/A. Key Features Measures both AC and DC current Current measurement range: -20A to +20A Hall-effect based sensing Typical sensitivity: 100mV/A Analog voltage output Approx. 2.5V output at zero current Electrical isolation between sensing circuit and measured current Low internal conductor resistance Fast response Simple interface with Arduino and other microcontrollers Compact and easy-to-install module Suitable for robotics, automation and power-monitoring projects How It Works Current flows through the high-current terminal of the module. The ACS712 detects the magnetic field generated by the current using its Hall-effect sensing element and converts it into an analog voltage. With a 5V supply, the output is approximately 2.5V when there is no current. As current flows in one direction, the output voltage increases, while current flowing in the opposite direction causes the output voltage to decrease. For the 20A version: Sensitivity ≈ 100mV per Ampere This analog output can be read using an ADC input on an Arduino, ESP32 or other compatible controller to calculate the current. Applications Arduino current measurement projects ESP32 current monitoring DC motor current measurement Battery charging and discharging monitoring Power supply current monitoring Solar power monitoring systems Robotics projects Automation systems Over-current detection Energy monitoring systems DC load monitoring AC appliance current monitoring Smart power-meter projects Typical Applications with Arduino / ESP32 The ACS712-20A can be connected to an analog input of a microcontroller. The controller reads the sensor's analog output and calculates the corresponding current. It is particularly useful for projects where you need to monitor the current consumption of motors, batteries, power supplies, LED systems, pumps and other electrical loads.