ACS712 30A Current Sensor

ACS712 30A Current Sensor Module

The ACS712 30A Current Sensor Module is a high-precision Hall-effect–based current sensing module designed to measure AC and DC current up to ±30 amperes. It provides a linear analog voltage output proportional to the current flowing through the sensor, while maintaining electrical isolation between the power circuit and the control circuit.

Working Principle

The ACS712 operates on the Hall Effect principle:

• When current flows through the internal copper conduction path, it generates a magnetic field.

• A Hall sensor inside the IC detects this magnetic field.

• The IC converts it into a proportional analog voltage output.

• The output voltage shifts above or below a midpoint (Vcc/2) depending on current direction.

This allows safe and isolated current measurement without direct electrical contact.

Key Features

• Measures AC and DC current

• High accuracy and linear output

• Electrical isolation between input and output

• Low noise and stable performance

• Compact PCB module

• Easy interface with microcontrollers

Electrical Specifications

• Sensor IC: ACS712

• Current Range: ±30 A

• Sensitivity: ~66 mV/A

• Operating Voltage: 5 V DC

• Output Type: Analog

• Output Offset: Vcc / 2 (≈2.5 V at zero current)

• Bandwidth: 80 kHz

• Response Time: < 5 µs

Pin Configuration

• VCC: 5 V power supply

• OUT: Analog voltage output

• GND: Ground

Terminal Block

• IP+ / IP−: Current input terminals (series connection with load)

Applications

• Power monitoring systems

• Over-current protection circuits

• Energy meters

• Solar power systems

• Motor control systems

• Battery monitoring

• Arduino, ESP32, Raspberry Pi projects

Advantages

• Safe isolated current sensing

• Measures both AC and DC current

• No power loss in sensing path

• Easy to calibrate

• Suitable for high-current applications

Limitations

• Requires calibration for accurate results

• Sensitive to temperature variation

• Noise may require software or hardware filtering

Conclusion

The ACS712 30A Current Sensor Module is a reliable and efficient solution for measuring high currents in embedded systems. Its Hall-effect isolation, wide current range, and microcontroller compatibility make it ideal for power monitoring, automation, and IoT projects.