⚡ Current Sensors – Accurate Monitoring for Your Projects
Current sensors are devices that measure electrical current flowing through a circuit and provide an analog or digital output proportional to the current. They are essential in battery management, motor control, power monitoring, and DIY electronics. Most sensors are based on Hall effect technology, allowing non-intrusive current measurement without directly connecting the sensing circuit in series.
🔧 Common Current Sensors by Rating
5 A Current Sensor
Max Current: 5 A DC
Type: Hall effect, non-invasive or inline
Output: Analog voltage proportional to current (typically 0–5 V)
Applications: Small motor control, Arduino battery monitoring, low-power circuits
Features: Low-voltage drop, high sensitivity, compact design
20 A Current Sensor
Max Current: 20 A DC
Type: Hall effect or ACS712 module-style
Output: Analog voltage proportional to current
Applications: Medium-power motor control, battery packs, DIY power meters
Features: High-accuracy, isolation between high-current line and measurement circuit
30 A Current Sensor
Max Current: 30 A DC
Type: Hall effect / ACS714-style module
Output: Analog voltage proportional to current
Applications: High-power battery monitoring, inverters, motor drives
Features: Non-intrusive sensing, stable output, wide current range
🧠 How They Work
The sensor detects magnetic fields generated by current flow using a Hall effect sensor.
Generates a voltage output proportional to the current passing through the conductor.
Microcontrollers can read this voltage via an ADC to calculate the current in amperes.
Some modules include zero-current offset, so output at 0 A is mid-supply (e.g., 2.5 V for 5 V supply).
💡 Practical Tips
Always check the current rating to prevent damage to the sensor.
Use proper calibration to ensure accurate current measurement.
Works great for Arduino, ESP32, Raspberry Pi, and other microcontrollers.
Can be combined with power calculation (Voltage × Current) for battery monitoring or energy meters.
Ensure sufficient spacing or shielding to reduce magnetic interference from nearby conductors.