top of page

Build Your Own DIY Magnetometer or Solar Storm/Aurora Observatory with Grove

Updated: Aug 22, 2023

Are you fascinated by the idea of building a DIY metal detector capable of detecting objects at significant depths? Or do you have an interest in constructing a solar storm or aurora observatory?

In this comprehensive guide, we'll introduce you to The Grove - Magnetometer Sensor v1.0, a revolutionary device that offers highly precise magnetic field measurements. This exceptional sensitivity unlocks a world of possibilities, making it a versatile tool for various projects and applications.

The Grove - Magnetometer Sensor v1.0
The Grove - Magnetometer Sensor v1.0

Things used in this project

Hardware components:

  • Arduino UNO,

  • Seeed Studio Grove Base Shield V2.0 for Arduino,

  • Seeed Studio Grove - 16 x 2 LCD,

  • FG-3+ Sensor

Software apps : Arduino IDE

Cutting-Edge DIY Magnetometer Technology

The DIY Grove - Magnetometer Sensor v1.0 represents the cutting-edge of magnetometer technology. Compared to traditional integrated IC solutions like Bosch BMM150 and HMC5883L, this sensor provides magnetic field measurements with unmatched precision, being 1000 times more accurate. This incredible sensitivity opens the door to a multitude of applications and experiments.


  1. Metal Detection: The sensor's capability to detect metal at depths up to 10 meters is a game-changer for treasure hunters, archaeologists, and hobbyists alike. Uncover buried artifacts and hidden treasures with confidence using this powerful tool.

  2. Vehicle Presence Detection: The sensor's responsiveness to magnetic fields allows for the detection of vehicles. Use it to monitor traffic flow, analyze patterns, and optimize parking lot occupancy.

  3. Safety Inspections and Weapon Detection: With its ability to sense magnetic field changes, the sensor is ideal for walk-through safety inspections in high-security areas. It can also serve as an efficient weapon detector.

  4. Aurora and Solar Storm Monitoring: Scientists and space enthusiasts can harness the sensor's precision to study and monitor awe-inspiring auroras and potentially hazardous solar storms.

  5. Space Weather Observatory: Space weather research relies on accurate measurements of magnetic fields. The sensor's data can contribute to space weather observatories, advancing our understanding of space phenomena.

  6. Earth Magnetic Field Monitoring: By monitoring the Earth's magnetic field changes, researchers gain valuable insights into geophysical processes and seismic activities.

Discover how to effortlessly connect The DIY Grove - Magnetometer Sensor v1.0 to Arduino and initiate measurement readings in this exciting project.

The Grove - Magnetometer Sensor v1.0
The Grove - Magnetometer Sensor v1.0

The sensor requires a 5V power supply and provides two outputs:

A-OUT: Analog output that varies voltage (0V to 3V) in response to magnetic field strength, covering the sensor's full output range.

D-OUT: Frequency output that changes with the magnetic field, ranging from approximately 40kHz to 130kHz.

In this demonstration, we'll show you how to display the digital output frequency readings on a 2x16 display.

The Grove - Magnetometer Sensor v1.0 Readout
The Grove - Magnetometer Sensor v1.0 Readout

The screwdriver was employed to manipulate and shape the magnetic field around the sensor.

Hardware Setup and Demonstration

Getting started with The Grove - Magnetometer Sensor v1.0 is a straightforward process. Begin by connecting the Grove Base Shield V2.0 to your Arduino UNO. Then, attach the Magnetometer Sensor v1.0 to the D2 port. For the final step in the hardware setup, connect the display to any of the I2C ports. These components come together to create a robust sensor system.

The Grove - Magnetometer Sensor v1.0 Hardware Connections
The Grove - Magnetometer Sensor v1.0 Hardware Connections

Next, upload the provided demo code into your Arduino IDE and upload it to your Arduino board. This code enables the sensor to read magnetic field data and display it through the connected display. With the setup complete, move a magnetic or ferromagnetic object close to the sensor and observe the readings. The sensor's output will vary based on the strength and proximity of the magnetic field, providing valuable data for analysis.


Embark on a Magnetometer Journey

The Grove - Magnetometer Sensor v1.0 is just the beginning of your journey into magnetometer technology. For those interested in exploring more projects and products related to flux-gate magnetometers, the world of DIY magnetometer/metal detector kits awaits. These kits provide an exciting opportunity to build your own customizable magnetometer or metal detector, tailored to your specific needs and preferences. Whether you're a hobbyist, a student, or a researcher, these kits offer an educational and rewarding experience.

Explore FG Sensors - Your Magnetometer Experts

Moreover, at FG Sensors, we are committed to providing super sensitive 3-axis magnetometer solutions. Our products are meticulously designed to deliver accurate and reliable measurements, catering to a wide range of applications. Notably, our sensors boast the capability of remote observation of magnetometer data directly on your smartphone, offering convenience and accessibility like never before.

For technical support, feedback, or any inquiries, please don't hesitate to contact us at with our contact form.

We value your insights and strive to continuously improve our products and services based on your needs.

Gratitude to Seeed Studio

A significant part of our success is owed to Seeed Studio, an esteemed partner that provided invaluable support in manufacturing The Grove - Magnetometer Sensor v1.0. We extend our heartfelt gratitude, especially to Amanda, for her exceptional assistance throughout the development process. The collaboration with Seeed Studio has been pivotal in bringing this advanced sensor to life.

If you are interested in developing your sensor using Seeed Studio's resources and expertise, click here to explore further possibilities. Their extensive knowledge and resources can help turn your innovative ideas into reality.

Additionally, for the best PCBA service, we highly recommend Seeed Fusion PCBA service. Their dedication to excellence and commitment to quality make them the perfect partner for your PCB assembly needs.


In conclusion, The Grove - Magnetometer Sensor v1.0 is a powerful and versatile tool with applications in various fields, from metal detection to space weather observation. Its remarkable sensitivity and precision make it an indispensable choice for both hobbyists and professionals. Through this comprehensive guide, we have introduced you to the sensor, provided step-by-step guidance on hardware setup, and explored its wide range of potential applications. Furthermore, we have highlighted exciting DIY projects and products related to magnetometers, inviting you to embark on fascinating explorations in the world of magnetometer technology. Whatever your interests or expertise may be, The Grove - Magnetometer Sensor v1.0 awaits your creativity and ingenuity.

Build Your Own Magnetometer or Solar Storm/Aurora Observatory with Grove

900 views2 comments


Mazoo Elmasry
Mazoo Elmasry
Nov 28, 2023

Grove_magnetometer sensor v1.0


Mazoo Elmasry
Mazoo Elmasry
Nov 28, 2023

I want just converter without sensor

I have two sensor

bottom of page