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The ACS712 20A Current Sensor Module provides an accurate, economical solution for AC or DC current sensing in industrial, commercial, and DIY electronics systems. The module centers around Allegro’s ACS712TELC-20A IC, which uses an internal Hall-effect sensor to detect the magnetic field generated by current flowing through an onboard copper conduction path.

Because the copper conductor path is galvanically isolated from the sensor leads, the high-power load circuit ($0\text{V}-250\text{V}$) remains physically separated from the microcontroller board ($5\text{V}$ logic), preventing high-voltage spikes or ground loops from damaging low-voltage microcontrollers. The module outputs an analog voltage signal (VOUT​) that scales linearly with current: at $0\text{A}$, the output rests at $2.5\text{V}$ (half of VCC​); for every Ampere of positive current, the voltage increases by $100\text{ mV}$, and for every Ampere of negative current, it decreases by $100\text{ mV}$.

Key Features and Benefits

• Measures Both AC and DC Current: Capable of measuring bidirectionally up to $\pm 20\text{A}$ continuous load current.

• Integrated Galvanic Isolation: $2100\text{V RMS}$ voltage isolation rating protects microcontrollers from high AC/DC voltages.

• Low Internal Resistance: $1.2\text{ m}\Omega$ copper internal conductor minimizes power loss and heat generation on the module board.

• Linear $100\text{ mV/A}$ Output: Precise linear voltage scale simplifies analog-to-digital software calculations in microcontroller code.

• Heavy-Duty Screw Terminal: Onboard 2-pin screw terminal block accepts high-current gauge wires up to 12 AWG safely.

Technical Specifications

Pinout & Wiring Guide

3-Pin Logic Header:

• VCC: Supply Voltage Positive ($+5.0\text{V DC}$).

• GND: Power Supply Ground ($0\text{V}$).

• OUT: Analog Voltage Output (Connect to Arduino ADC pin A0).

2-Pin Heavy Duty Screw Terminal:

• IP+ & IP-: Insert in SERIES with the load wire whose current you want to measure.

SAFETY WARNING: High Current/Voltage Caution. Ensure all screw connections are fully tightened. Never place the terminal block in parallel across a power supply or battery, as this will create a direct short circuit.

Arduino Quick-Start Code Example (DC Current Reading)

// ACS712 20A Current Sensor Code
const int SENSOR_PIN = A0;
const float VCC = 5.0;            // Operating Voltage
const float SENSITIVITY = 0.100;  // 100 mV/A = 0.100 V/A for 20A Model

void setup() {
  Serial.begin(9600);
  Serial.println("ACS712 20A Current Sensor Test Initialized.");
}

void loop() {
  int rawADC = analogRead(SENSOR_PIN);
  float voltage = (rawADC * VCC) / 1023.0; // Convert ADC value to Volts
  
  // Calculate current (Voltage - Offset) / Sensitivity
  float current = (voltage - (VCC / 2.0)) / SENSITIVITY;

  Serial.print("Raw ADC: ");
  Serial.print(rawADC);
  Serial.print(" | Voltage: ");
  Serial.print(voltage, 3);
  Serial.print(" V | Current: ");
  Serial.print(current, 2);
  Serial.println(" A");

  delay(1000);
}

Applications

• Solar Charge Controllers & Inverters: Measuring solar panel output currents and battery charge rate.

• Motor Speed & Stall Controllers: Real-time motor current draw monitoring for robotics, CNC machines, and electric vehicles.

• Smart Energy Meters & Overcurrent Protection: Detecting overcurrent fault conditions and tripwire relays in domestic power distribution.

• Switch Mode Power Supplies (SMPS): Current-mode feedback and power consumption logging.

Package Includes

• 1 x ACS712 20A Range Current Sensor Module

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components