The ACS712 30A Current Sensor Module is a Hall-effect–based current sensing solution designed to measure both AC and DC currents safely and accurately. By providing electrical isolation between the current path and the measurement circuitry, it enables reliable current monitoring in power systems, motor control, and embedded electronics projects.
Core Module Specifications
• Sensor Type: Hall-effect current sensor
• Sensor IC: ACS712
• Current Measurement Range: ±30 A
• Measurable Current Type: AC and DC
• Isolation Type: Galvanic isolation
Electrical & Interface
• Operating Voltage: 5 V
• Output Type: Analog voltage
• Sensitivity: ~66 mV/A (30A variant)
• Zero Current Output: ~2.5 V (at 5 V supply)
• Interface Pins: VCC, GND, OUT
• Current Path Terminals: IP+ and IP−
Performance Characteristics
• Measures bidirectional current flow
• Fast response suitable for dynamic loads
• Low noise with proper filtering
• Accuracy depends on calibration and filtering
Physical Characteristics
• Module Type: PCB-mounted current sensor
• Through-hole screw terminals for current path
• Compact and robust design
Compatibility
• Arduino Uno / Nano / Mega
• ESP8266 / ESP32 (ADC range consideration required)
• STM32, AVR, PIC microcontrollers
• Raspberry Pi (with external ADC)
Key Advantages
• Electrical isolation improves safety
• Supports both AC and DC current sensing
• Simple analog interface
• Widely used and well documented
Technical Insights
• Output voltage is centered at VCC/2 for zero current
• External RC filter can reduce noise
• Sensitive to temperature drift at high currents
• ADC resolution directly affects measurement accuracy
Applications
• Power consumption monitoring
• Motor current sensing
• Over-current protection systems
• Inverters and UPS monitoring
• Battery and load analysis
Pro Tip
• Calibrate zero-current offset in software
• Use averaging or low-pass filtering for AC measurements
• Ensure proper heat dissipation at high currents
• Keep signal wires short to reduce noise
Package Includes
• 1 × ACS712 30A Current Sensor Module