ACS712 5A Current Sensor Module — Hall Effect AC/DC

The ACS712 is a fully integrated Hall effect-based linear current sensor from Allegro MicroSystems. The 5A variant measures both AC and DC currents up to ±5A and outputs an analog voltage proportional to the measured current. It provides galvanic isolation between the current path and the microcontroller, making it safe and easy to use with Arduino, ESP32, and STM32 for power monitoring and energy metering projects.

Technical Specifications

Pinout

Key Features

• Measures both AC and DC currents up to ±5A
• Galvanic isolation — safe measurement of high-voltage circuits
• Analog output: 185 mV/A sensitivity, centered at 2.5V
• 80 kHz bandwidth — suitable for power quality analysis
• Compatible with Arduino, ESP32, STM32, PIC ADC inputs

Current Calculation

Current (A) = (Vout − 2.5) ÷ 0.185

Applications

• AC/DC power monitoring and energy metering
• Solar panel and battery current measurement
• Motor current monitoring and overcurrent protection
• Smart home energy management systems
• Industrial load monitoring

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