ACS712 Hall Effect Current Sensor Module 5A 20A 30A | ALLOYSEED

ACS712 Hall Effect Current Sensor Module – Precise 5A / 20A / 30A Detection

Take full control of your electronics projects with the ACS712 Current Sensor Module by ALLOYSEED. Built around the trusted ACS712ELC-05B chip, this compact Hall Effect sensor board delivers accurate, real-time measurement of both positive and negative AC/DC currents across three selectable ranges: 5A, 20A, and 30A. Whether you're building an Arduino power monitor, a solar charge controller, or an industrial automation circuit, this module is your go-to solution for reliable current sensing.

Made in Mainland China.

Key Features

• Accurate Current Sensing: Powered by the ACS712ELC-05B chip, this module measures both positive and negative currents from 5A up to 30A with analog output sensitivity ranging from 100 mV/A to 185 mV/A for precise readings every time.
• Easy 5V Power Supply: A convenient pin header interface connects directly to a standard 5V power source. An onboard power indicator LED gives you instant visual confirmation that the module is active and ready.
• Ultra-Compact PCB Design: At just 31 mm × 13 mm (1.22 × 0.51 in) and weighing only 3 g, this board fits into tight enclosures and breadboard setups with ease. The green screw terminal ensures a secure, tool-friendly wire connection.
• Stable Default Voltage Output: When no current flows, the module outputs a default VCC/2 voltage, providing a stable baseline that makes signal processing and threshold detection straightforward for any microcontroller.
• Broad Microcontroller Compatibility: Works seamlessly with Arduino, Raspberry Pi, ESP32, STM32, and other 5V/3.3V MCU platforms. Ideal for DIY electronics, robotics, energy monitoring, and embedded system prototyping.
• Hall Effect Technology: Non-contact current measurement means no need to break the circuit — simply route the current-carrying wire through the module's terminal for safe, isolated sensing.

Specifications

Ideal Applications

• Arduino & Raspberry Pi power monitoring projects
• Solar panel and battery charge controllers
• Motor current protection circuits
• Home energy monitoring systems
• Industrial automation and robotics
• DIY electronics and educational STEM projects

Important Usage Note

The ACS712 sensor operates on Hall Effect principles and can be affected by strong external magnetic fields. For best accuracy, keep the module away from powerful magnets or electromagnets during operation. Allow 1–2 cm measuring tolerance due to manual measurement of the PCB dimensions. Slight color variation from product images may occur due to monitor calibration differences.

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Further Reading

For guidance on electrical safety standards and best practices when working with electronic modules and current sensors, visit the NIST Engineering Laboratory – Smart Grid Research.

Frequently Asked Questions

Q: What is the difference between the ACS712 5A, 20A, and 30A modules?

A: Each variant of the ACS712 current sensor module is factory-calibrated for a different maximum current range. The 5A version offers the highest sensitivity at 185 mV/A, making it ideal for low-power circuits. The 20A version outputs 100 mV/A and suits medium-load applications, while the 30A version (also 66 mV/A) is best for high-current systems like motor control or solar power management. Choose the range that matches your expected peak current for the most accurate readings.

Q: Is the ACS712 current sensor module compatible with Arduino and Raspberry Pi?

A: Yes! The ACS712 Hall Effect current sensor module is fully compatible with Arduino (Uno, Nano, Mega), Raspberry Pi, ESP32, STM32, and virtually any microcontroller that has an analog input and operates at 5V. Simply connect VCC to 5V, GND to ground, and read the analog output pin with your ADC. Many open-source libraries and sketches are available to simplify integration.

Q: Can this module measure both AC and DC current?

A: Yes. The ACS712 sensor chip is capable of measuring both AC (alternating current) and DC (direct current). For AC measurements, you'll need to apply RMS calculation in your code, typically by sampling the output over a full cycle and computing the root mean square value. For DC, a simple analog read and offset correction (from the VCC/2 baseline) is sufficient.

Q: What precautions should I take when using the ACS712 Hall Effect sensor?

A: To ensure accurate current measurements, keep the ACS712 module away from strong magnetic fields such as large transformers, motors, or permanent magnets, as these can interfere with Hall Effect sensing. Also ensure your power supply is a clean, stable 5V — voltage fluctuations can affect the output accuracy. Always route only the current-carrying wire (not the entire circuit) through the module's screw terminal for proper operation.