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 wont fry your sensitive microcontroller. The 20A version is the sweet spot for most DIY projects, capable of handling beefy motors and household appliances.
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.
| Feature | Specification |
| Supply Voltage (VCC) | 4.5V to 5.5V DC |
| Measurement Range | -20A to +20A |
| Sensitivity | 100 mV/A (Millivolts per Amp) |
| Output at 0A | VCC / 2 (Typically 2.5V) |
| Internal Resistance | 1.2 m (Very low power loss) |
| Bandwidth | 80 kHz |
| Dimensions | 31mm x 13mm |
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.
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