ACS712 Hall Current Sensor Module 5A/20A/30A with Power Indicator for Arduino

$8.24 USD

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ACS712 Hall Effect Current Sensor Module — 5A / 20A / 30A, Analog Output, Arduino

A non-invasive Hall effect current sensor module based on the Allegro ACS712 IC, providing isolated AC and DC current measurement via a simple analog voltage output. Available in 5A, 20A, and 30A full-scale ranges, the module outputs a voltage proportional to the measured current (2.5V at zero current, scaling at 185mV/A for 5A, 100mV/A for 20A, or 66mV/A for 30A). Compatible with Arduino, ESP32, and any microcontroller with an ADC input.

Technical Specifications

Parameter	Value
IC	Allegro ACS712 (ELC-05B / ELC-20A / ELC-30A)
Current Ranges	5A / 20A / 30A (select variant)
Output Type	Analog voltage (ratiometric)
Zero-Current Output	VCC/2 = 2.5V (at 5V supply)
Sensitivity	185mV/A (5A) / 100mV/A (20A) / 66mV/A (30A)
Bandwidth	80kHz (−13dB)
Isolation Voltage	2.1kV RMS (galvanic isolation)
Supply Voltage	5V DC
Operating Temperature	−40°C to +85°C
Power Indicator	Yes (onboard LED)
Certification	RoHS

Variant Selection Guide

Variant	Full Scale	Sensitivity	Best For
ACS712-05B	±5A	185mV/A	Arduino, small motors, LED drivers (<5A)
ACS712-20A	±20A	100mV/A	DC motor drives, battery chargers (5–20A)
ACS712-30A	±30A	66mV/A	High-current loads, solar charge controllers (20–30A)

Typical Applications

Arduino Power Monitor: Measure DC current consumption of Arduino projects, battery packs, and power supplies with analog ADC input
Motor Current Sensing: Monitor DC motor current for overload detection, stall detection, and efficiency measurement in robot and automation projects
Solar Charge Controller: Measure solar panel output current and battery charge current in DIY MPPT and PWM solar charge controllers
Battery Management: Coulomb counting for battery state-of-charge estimation in Li-ion and lead-acid battery management systems
Home Energy Monitor: Non-invasive AC current measurement for home energy monitoring systems (with appropriate AC signal conditioning)
Overcurrent Protection: Hardware overcurrent detection trigger for relay or MOSFET cutoff circuits in power distribution systems

Arduino Wiring & Code

VCC → Arduino 5V | GND → GND | OUT → Arduino A0
Read: int raw = analogRead(A0);
Convert: float voltage = raw * (5.0 / 1023.0);
Current (5A): float current = (voltage - 2.5) / 0.185;
Current (20A): float current = (voltage - 2.5) / 0.100;
Current (30A): float current = (voltage - 2.5) / 0.066;

FAQ

Q: Can the ACS712 measure AC current?
A: Yes. The ACS712 measures both AC and DC current. For AC measurement, read multiple samples over a full cycle and calculate RMS: Irms = peak / √2. Use the EmonLib library for Arduino AC power measurement.

Q: Is the ACS712 galvanically isolated?
A: Yes. The ACS712 provides 2.1kV RMS galvanic isolation between the current-carrying conductor and the signal output, protecting the microcontroller from high-voltage circuits.