Current Sensor ACS712 (5A) RobotDYN

Features

• Based on ACS712ELC-05B Hall-effect IC
• Measures AC and DC current up to ±5A
• Analog output sensitivity: 185 mV/A
• 5V operating voltage
• Output offset voltage at VCC/2 when no current flows
• Low-noise analog signal path
• Near-zero magnetic hysteresis
• Onboard power LED indicator
• Electrical isolation between load and control side

Specifications

• Measuring Range: ±5A
• Output Sensitivity: 185 mV/A
• Operating Voltage: 5V DC
• Zero Current Output: ~2.5V (VCC/2)
• Internal Conductor Resistance: 1.2 mΩ
• Total Output Error: ±1.5% at 25°C
• Bandwidth: 80 kHz
• PCB Dimensions: Approx. 36 × 18.5 mm

Working Principle

The module operates based on the Hall Effect. Internally, a copper conductor connects the IP+ and IP- terminals. When current flows through this conductor, a magnetic field is generated. The Hall sensor detects this magnetic field and converts it into a proportional voltage.

Because the sensing element is isolated from the current path, the input (load side) and output (microcontroller side) remain electrically separated, improving safety.

Pinout

Applications

• Electrical load monitoring
• Over-current protection
• Switched-mode power supplies (SMPS)
• Battery charging systems
• Power management systems

Arduino Connection Example

• Module VCC → Arduino 5V
• Module GND → Arduino GND
• Module OUT → Arduino A0
• Load connected in series through IP+ and IP- terminals

Arduino Example Code (Using ACS712 Library)

#include "ACS712.h"

ACS712 sensor(ACS712_05B, A0);

void setup() {
  Serial.begin(9600);
  sensor.calibrate();
}

void loop() {
  float I = sensor.getCurrentAC();

  if (I < 0.09) {
    I = 0;
  }

  Serial.println(I);
  delay(300);
}

Library

Requires an ACS712 Arduino library compatible with the ACS712_05B version.

Install the library in the Arduino IDE libraries folder and restart the IDE before compiling the example code.

Available Variants