ACS712 Current Sensor Module 5A

The ACS712 5A Current Sensor Module is a precision current sensing solution built around Allegro's ACS712ELC-05B Hall-effect linear current sensor IC . This module is designed to measure both AC and DC currents in the range of -5A to +5A with high linearity, providing a reliable analog voltage output proportional to the current flowing through its internal sensing path. The sensor operates on the principle of the Hall effect : current flowing through the internal copper conduction path generates a magnetic field, which is detected by the integrated Hall element and converted into a precisely calibrated voltage signal. The module outputs 185 mV per ampere , with a quiescent output voltage of VCC/2 (~2.5V) when no current is being measured. Positive and negative readings around this midpoint represent bidirectional current flow , making the sensor equally suitable for DC battery applications and AC mains monitoring within its rated range. The board features a 5V power input , an onboard power indicator LED , and three clearly labeled output pins ( VCC, GND, OUT ), allowing for direct connection to the analog input pin of any microcontroller such as Arduino, ESP32, STM32, or Raspberry Pi (via ADC). It is electrically isolated between the current path and the signal path, providing a safe and clean way to monitor current without injecting noise into the measurement circuit. Important note: Since the ACS712 relies on Hall-effect sensing , the module should be installed away from strong external magnetic fields to avoid measurement errors. Specifications Sensor IC: ACS712ELC-05B (Allegro Hall-effect) Current Range: -5A to +5A (AC or DC) Sensitivity (Output): 185 mV/A Quiescent Output Voltage: VCC / 2 (~2.5V) at 0A Operating Voltage: 5V DC Output Type: Analog voltage (linear) Bandwidth: Up to 80 kHz Isolation Voltage: 2.1 kV RMS between current path and signal path Onboard Indicator: Power LED Color: Blue Material: PCB + Metal terminals Dimensions: 31 × 13 × 14 mm (1.22" × 0.51" × 0.55") Weight: 4g (0.14 oz) Applications Battery Monitoring Systems for charge and discharge tracking Motor Current Sensing in DC motors, servos, and stepper drivers Power Supply Monitoring in DC-DC converters and regulators Overcurrent Protection circuits for safety and fault detection Solar Power Systems to monitor panel and battery currents Robotics Projects requiring real-time current feedback Smart Home Energy Meters and IoT power monitoring devices Arduino and Raspberry Pi Projects for current measurement experiments Industrial Automation for load monitoring and diagnostics Electric Vehicle (EV) Hobby Projects including e-bikes and scooters Educational STEM Labs teaching electrical measurement principles PWM and Inverter Circuits where fast response current sensing is required