Qwiic Magnetometer (MLX90393) Hookup Guide
The MLX90393 is a tri-axial magnetic sensor capable of sensing very small fields while behaving as one would want and expect during saturation in larger fields (like a nearby magnet). It turns out the favorite HMC5883L and other such sensors that are intended for compass applications have a low dynamic range but also strange and undefined behavior in large fields. Ted Yapo did an incredibly extensive characterization of the sensor over on Hackaday. He published his controlled experiments testing a few sensors and found the MLX90393 to be superior.
The MLX90393 can be used as a compass sensor but also works well as a non-contact controller (joystick), flow meter (with magnetic impeller), or a linear actuator position sensor. The breakout board is also a part of SparkFun's Qwiic system, so you won't have to do any soldering to figure out what the magnetic fields look like.
In this hookup guide, we'll get going by getting some basic readings from the sensor, then look at how to configure the sensor on different I2C addresses.
To get started, you'll need a microcontroller to control everything in your project.
SparkFun ESP32 ThingDEV-13907
Particle Photon (Headers)WRL-13774
Raspberry Pi 3DEV-13825
Now, to get your microcontroller into the Qwiic ecosystem, the key will be one of the following Qwiic shields to match your preference of microcontroller:
SparkFun Qwiic HAT for Raspberry PiDEV-14459
SparkFun Qwiic Shield for ArduinoDEV-14352
SparkFun Qwiic Shield for PhotonDEV-14477
You will also need a Qwiic cable to connect the shield to your magnetometer, choose a length that suits your needs.
Qwiic Cable - 100mmPRT-14427
Qwiic Cable - 500mmPRT-14429
Qwiic Cable - 50mmPRT-14426
Qwiic Cable - 200mmPRT-14428
Or, here's the wishlist to follow along exactly with this guide:
If you aren't familiar with the Qwiic system, we recommend reading here for an overview.
|Qwiic Connect System|
We would also recommend taking a look at the hookup guide for the Qwiic Shield if you haven't already. Brushing up on your skills in I2C is also recommended, as all Qwiic sensors are I2C.