ACS712 20A Range Current Sensor Module – Hall Effect AC/DC Current Monitor for Arduino & ESP32

Overview 

The ACS712 20A Module is a precise, low-cost solution for AC or DC current sensing. Based on the Allegro ACS712ELCTR-20A-T chip, it provides an analog voltage output that varies linearly with the sensed current. Because it uses a Hall Effect sensor, it provides galvanic isolation, ensuring that the high-power circuit you are measuring won’t fry your sensitive microcontroller. The 20A version is the “sweet spot” for most DIY projects, capable of handling beefy motors and household appliances.

Key Features

• Dual-Mode Sensing: Accurately measures both Alternating Current (AC) and Direct Current (DC).

• Electrical Isolation: The conduction path is internally isolated from the sensor leads (up to 2.1kV), providing safety for your logic circuits.

• Low Noise: Features an integrated filter for cleaner signals, though it remains easy to add external filtering for high-precision needs.

• Simple Interface: Connects to any Analog-to-Digital Converter (ADC) pin on your Arduino, ESP32, or PIC.

• Compact Footprint: Includes a screw terminal for easy connection to the current path and header pins for the logic side.

Technical Specifications

Why 20A instead of 5A or 30A? 

• Vs 5A: The 20A version allows you to monitor larger loads like water pumps or heaters that would blow a 5A sensor.

• Vs 30A: The 20A version provides better resolution (100mV/A) than the 30A version (66mV/A), making it more accurate for medium-sized loads.