Gravity: BMM350 3-axis Geomagnetic Sensor

1. Example Code for Arduino-Get All State

Get all the config status, self test status; the sensor turns to sleep mode from normal mode after reset. Experimental phenomenon: serial print the sensor config information and the self-test information.

2. Example Code for Arduino-Threshold Interrupt

Set the interrupt to be triggered when beyond/below threshold, when the interrupt at a axis occur, the relevant data will be printed in the serial port. Experimental phenomenon: when the geomagnetic data at 3 axis (x, y, z) beyond/below threshold, serial print the geomagnetic data, unit (uT). Experimental phenomenon: the main controller interrupt will be triggered by level change caused by INT pin interrupt, then the geomagnetic data can be obtained.

3. Example Code for Arduino-Get Geomagnetic Data

Get the geomagnetic data at 3 axis (x, y, z), get the compass degree. "Compass Degree", the angle formed when the needle rotates counterclockwise from the current position to the true north. Experimental phenomenon: serial print the geomagnetic data of x-axis, y-axis and z-axis and the compass degree.

4. TMR Sensor Technology Overview and Comparison with AMR and GMR

This document introduces the principles, structure, and operating mechanism of Tunnel Magnetoresistance (TMR) sensor technology and provides a detailed comparison with other magnetic sensing technologies, such as AMR and GMR. It aims to help readers understand the performance advantages, application scenarios, and selection considerations of TMR sensors in modern electronic systems.