2X ACS712 Hall Effect Current Sensor Module (5A / 20A / 30A) for Arduino (2 Pieces)
The ACS712 Hall Effect Current Sensor Module measures both AC and DC current and outputs a simple analog voltage you can read with any Arduino, ESP32, or other 5V microcontroller. Built around the Allegro ACS712 Hall-effect IC, it provides electrical isolation between the current you're measuring and your control electronics, so you get accurate readings without breaking into sensitive low-voltage wiring.
⚠️ Please Select Your Range Before Purchasing: This module is factory-set to one current range -- 5A, 20A, or 30A -- and the sensitivity cannot be changed after manufacturing. Choose the variation that matches your project's current levels.
🔧 How It Works
- Wire the load whose current you want to measure in series through the module's screw terminals
- Connect Vcc, Out, and Gnd to your microcontroller's 5V, analog input, and ground pins
- Current flowing through the module generates a magnetic field, which the internal Hall-effect sensor detects
- The module outputs an analog voltage proportional to that current, centered at 2.5V with no current flowing
⚡ Key Features
- Three Range Options: Available in 5A, 20A, or 30A versions -- select the one that fits your application
- Hall-Effect Sensing: No series resistor required, minimal insertion loss
- Electrical Isolation: 2.1kV RMS isolation between the current path and the signal side
- Analog Voltage Output: Proportional to current, easy to read with any microcontroller
- Measures AC or DC: Works with both types of loads
- Fast Response: 80kHz bandwidth with a 5µs output rise time
📐 Specifications
| Sensor IC |
Allegro ACS712 |
| Available Ranges |
5A (185mV/A) | 20A (100mV/A) | 30A (66mV/A) |
| Current Type |
AC or DC |
| Supply Voltage |
5V DC |
| Zero-Current Output |
2.5V (Vcc / 2) |
| Bandwidth |
80 kHz |
| Total Output Error |
±1.5% at 25°C |
| Isolation Voltage |
2.1kV RMS |
| Operating Temperature |
-40°C to +85°C |
| Connector Type |
3-pin header (Vcc, Out, Gnd) + 2-position screw terminal |
| Board Dimensions |
Approx. 31.73 × 13.25 × 14 mm (1.25 × 0.52 × 0.55 inches) L × W × H |
📦 What's in the Box
- 2x (2 Pieces) ACS712 Hall Effect Current Sensor Module (range as selected -- 5A, 20A, or 30A)
🔌 Compatible With
- Arduino Uno, Nano, Mega, and other 5V-logic boards
- ESP32 and ESP8266 (via a voltage divider on the analog input)
- Raspberry Pi Pico and other 5V-tolerant microcontrollers
🎯 Typical Applications
- Battery charge/discharge current monitoring
- Motor and pump current sensing
- Solar panel and inverter load monitoring
- Overcurrent detection and protection circuits
- DIY energy monitors and power usage meters
💡 Tip: The output sits at ~2.5V with zero current flowing -- this is normal, not zero volts. In your code, subtract 2.5V from the reading, then divide by the sensitivity of your variant (185mV/A, 100mV/A, or 66mV/A) to calculate current.
⚠️ Important Notes
- Not intended for automotive applications
- Do not exceed the rated current range for your selected variant -- sustained overcurrent can permanently damage the sensor
- Never connect the screw terminals directly to mains AC voltage without proper safety precautions and enclosures
- Keep the module away from strong magnetic fields or nearby ferrous metal, which can affect accuracy
🏪 About Envistia Mall
Envistia Mall is a US-based electronics retailer specializing in development boards, sensors, modules, and components for makers, engineers, and educators. We ship from the United States with fast handling times. Product documentation and technical support are available at our dedicated support site.
📦 Fast Free US Shipping | 🔄 Hassle-Free Returns | 📧 Responsive Customer Support
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