ACS712 5A Current Sensor

The ACS712 hall-effect current sensor measures both AC and DC current flowing through it with full isolation between the current path and the signal output — outputting an analogue voltage proportional to current. The 5 A variant is ideal for measuring motor current, battery charge current, and power consumption in embedded systems.

🔹 Key Applications

• Motor current monitoring and overcurrent protection
• Battery charge and discharge current measurement
• Solar panel current output monitoring
• Power consumption measurement in embedded systems
• AC mains current monitoring (via transformer)
• Overcurrent fault detection in automation systems

🔹 Why Choose This Module?

• Isolated measurement — no electrical connection between current path and MCU
• AC and DC measurement — measures both current types
• Analogue output — readable by any ADC-equipped MCU
• Onboard filtering — stable readings without external components
• 5 A range — ideal for most embedded and robotics applications

🔹 Technical Specifications

• Chipset: ACS712
• Current Range: ±5 A
• Sensitivity: 185 mV/A
• Output: Analogue (0.5–4.5 V at null)
• Operating Voltage: 5 V DC
• Isolation: Full galvanic isolation
• Bandwidth: 80 kHz

🔹 What's Included

1 × ACS712 5A Current Sensor Module

🔹 Pro Tip

💡 At zero current, the output is 2.5 V (midpoint of 5 V supply). Each amp of current shifts the output by 185 mV. Read the ADC value, subtract the zero-current ADC count, then divide by the sensitivity factor in code. Calibrate zero-current offset at startup for best accuracy. The ACS712-20A and ACS712-30A variants cover higher current ranges.

⚠️ Note: Always ensure proper heat dissipation and correct voltage configuration before powering connected devices.