IoT-based ELF Magnetic Flux Density Meter

This study presents an IoT-based ELF magnetic field meter that can measure magnetic flux density from 100nT. The proposed device has a flat response across the frequency range from 40Hz to 10 KHz, detecting and measuring most magnetic field sources. The proposed meter can measure fields from the power supply network (usually 50 or 60Hz) and harmonic frequencies extending several times above the base frequency in the operating frequency band. The proposed circuit of the magnetic flux density (magnetic field) meter is quite simple for implementation and the measured field can be displayed on any mobile device with Wi-Fi connectivity. A WeMos D1 Arduino board with an embedded ESP-8266 module is responsible for data transferring from the sensor to the cloud as a complete IoT solution, supported by the Blynk application via Android and iOS operating systems or web interface.