ACS712 20A Current Sensor Module is a reliable and cost-effective Hall Effect current sensing solution designed for measuring both AC and DC current up to 20A. Based on the ACS712 Hall-effect sensor IC, this module provides an analog voltage output proportional to the detected current, making it ideal for Arduino, ESP32, ESP8266, Raspberry Pi, STM32, and other microcontroller-based monitoring and control systems.

The module can detect current flow in both forward and reverse directions, providing a stable 2.5V output at 0A current. With low internal resistance, low noise signal output, and high accuracy, it is widely used in power monitoring, battery management, motor control, overcurrent protection, solar energy systems, and industrial automation applications.

Features:

• Measures both AC and DC current

• Based on Hall Effect sensing technology

• Supports current measurement up to ±20A

• Analog voltage output proportional to current

• Bi-directional current sensing

• 100mV/A sensitivity

• Low-noise analog signal path

• Electrical isolation between control and load circuits

• Stable output offset voltage

• Low internal conductor resistance

• High accuracy current monitoring

• Fast response time

• Adjustable bandwidth through filter pin

• Compact PCB module design

• Easy integration with Arduino and microcontrollers

Applications:

• Arduino current measurement projects

• ESP32 and ESP8266 power monitoring

• Battery charger systems

• Battery management systems (BMS)

• Digital watt meters

• Energy monitoring systems

• Solar power monitoring

• Motor current sensing

• DC power supply monitoring

• Overcurrent protection circuits

• Switching mode power supplies

• Robotics and automation systems

• Industrial control systems

• Smart energy management

• Embedded electronics projects

Benefits:

• Accurate AC and DC current measurement

• Safe Hall-effect isolated sensing

• Supports bidirectional current monitoring

• Low insertion loss due to low conductor resistance

• High sensitivity and fast response

• Suitable for real-time monitoring applications

• Easy interface with ADC-equipped microcontrollers

• Reliable long-term performance

How to Use:

• Connect VCC to a regulated 5V power source.

• Connect GND to system ground.

• Pass the load current through the module's current path terminals.

• Connect the analog output pin to a microcontroller ADC input.

• Read the output voltage using the ADC.

• Calculate the current using the sensitivity value of 100mV/A.

• At 0A current, the output voltage will be approximately 2.5V.

Product Instructions:

• Operate using a stable 5V power supply.

• Do not exceed the maximum measurable current range.

• Ensure correct wiring before applying power.

• Keep the module away from moisture and conductive contaminants.

• Use proper calibration for precision measurements.

• Add filtering if operating in noisy electrical environments.

Specifications:

• Module Type: Current Sensor Module

• Sensor IC: ACS712

• Current Range: ±20A

• Current Type: AC and DC

• Output Sensitivity: 100mV/A

• Operating Voltage: 5V DC

• Output Type: Analog Voltage

• Zero Current Output Voltage: 2.5V

• Bandwidth: 80kHz

• Internal Conductor Resistance: 1.2mΩ

• Total Output Error: 1.5% Typical at 25°C

• Signal Path: Low Noise Analog

• Filter Pin: Yes (Bandwidth Adjustable)

• Magnetic Hysteresis: Near Zero

• Sensing Technology: Hall Effect

• Isolation Type: Electrical Isolation Between Signal and Current Path

Package Includes:

• 1 x ACS712 20A Current Sensor Module

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