ACS712 Hall Effect Current Sensor Module 30A

Overview

The ACS712 30A Hall Effect Current Sensor Module is a compact, reliable solution for measuring AC and DC currents up to ±30A. Based on the proven ACS712 Hall Effect IC, the module translates conductor current into a proportional analog voltage suitable for microcontroller ADC inputs and data acquisition systems.

Key Features

• Current range: ±30A (AC and DC)
• Output sensitivity: 66 mV/A
• Provides galvanic isolation via Hall Effect sensing for safer measurements
• Analog voltage output proportional to the measured current
• Low noise and high accuracy for stable readings
• Operating voltage: 5V DC
• Compatible with Arduino, ESP32, STM32, Raspberry Pi and other development boards

Electrical Specifications

• Supply voltage: 5V DC
• Sensitivity: 66 mV per ampere (typical)
• Measurement range: ±30A
• Output type: Analog voltage (centered at Vcc/2 with no current)

How It Works

The ACS712 IC senses the magnetic field generated by current flowing through the conductor and produces an analog voltage proportional to that field. At zero current the output sits near Vcc/2; positive and negative currents shift the voltage above or below this midpoint, allowing measurement of both AC and DC currents with a single sensor.

Compatibility and Integration

• Directly interface with microcontroller ADCs (Arduino Uno, ESP32 ADC, STM32 ADC, Raspberry Pi with ADC converter)
• Ideal for use with common data acquisition and logging systems
• Requires an ADC reference that matches the module operating voltage for best accuracy

Applications

• Power monitoring and energy metering
• Motor control and robotics
• Battery management systems and chargers
• Over-current protection and fault detection
• Renewable energy inverters and monitoring

Calibration and Usage Tips

• Measure the module output with no load to determine the zero-current offset (Vcc/2).
• Use averaging or filtering in software to reduce measurement noise.
• For higher resolution on Raspberry Pi, use an external ADC (e.g., ADS1115) since Pi lacks built-in analog inputs.
• Keep the sensing conductor routed cleanly through the module to avoid external magnetic interference.

Safety and Notes

• The Hall Effect sensor provides electrical isolation between the measured conductor and the measurement electronics, improving safety.
• Do not exceed the specified current rating to avoid heating or damage.
• Allow for appropriate thermal management in high-current applications.

Package Contents

• 1 x ACS712 30A Hall Effect Current Sensor Module (5V)
• Documentation and example wiring diagrams (where applicable)

Note: Images are for illustration purposes only.