20A Current Sensor Module Based on ACS712
= High-Accuracy Hall Effect Sensor for AC/DC Measurement =
The ACS712 20A current sensor module enables accurate current measurement for both AC and DC circuits using the Hall effect principle. It is ideal for monitoring motor currents, battery loads, and over-current protection in Arduino and other microcontroller projects .
±20A Bidirectional Measurement - Measures both the magnitude and direction of current flow
100mV/A Sensitivity & 5V Operation - Analog output voltage increases by 100mV for every amp of current, with 2.5V output at zero current
Supply voltage: 4.5V to 5.5V DC ; Output at zero current: VCC/2 (approx. 2.5V) ; Sensitivity: 100mV/A
For Arduino, connect VCC to 5V, GND to GND, and OUT to an analog pin (e.g., A0). Use analogRead() to get the value and calculate the current .
The sensor is based on the Hall effect and is sensitive to external magnetic fields. Keep it away from magnets or large currents to avoid interference .
= Technical Specifications =
| Parameter | Value |
|---|
| -- | -- |
| Measurement Range | -20A to +20A (bidirectional) |
| Output Sensitivity | 100 mV/A |
| Zero-Current Output | VCC/2 (approx. 2.5V) |
| Isolation Voltage | 2500V RMS |
| Bandwidth | 120 kHz (typical) |
| Operating Temperature | -40°C to +85°C |
| Supply Current | <11mA |
= Key Features =
High Sensitivity and Accuracy Factorytrimmed and calibrated, with a total output error of ±1.5% at 25°C
+Versatile AC/DC Measurement - Can measure both direct and alternating currents, suitable for a wide range of applications
+High Voltage Isolation - Provides 2.1kVRMS isolation from the current path, ensuring safe operation
== Applications ==
- Motor phase current detection and control
- Battery load monitoring and management systems
- Inverter current sensing and over-current protection
- Digital power meters and programmable current sources
Reliable Sensor Builtin Allegro ACS712 chip with high accuracy and low noise for dependable measurements
Easy Integration Simple 3pin interface compatible with Arduino, Raspberry Pi, and other microcontrollers
| √ Compact size | typically 31 x 13mm |
√ On-board power LED indicator
√ Long and stable output offset voltage across temperature range
