OK we are now going to look at an MLX90393 attached to the STM32 Nucleo and all development will be done on the Arduino IDE – Install STM32 support in the Arduino IDE
The MLX90393 magnetic field sensor can be reprogrammed to different modes and with different settings at run-time. The sensor offers a 16-bit output proportional to the magnetic flux density sensed along the XYZ axes using the Melexis proprietary Triaxis® technology and also offers a temperature output signal. These digital values are available via I2C and SPI, where the MLX90393 is a slave on the bus.
By selecting which axes are to be measured, the raw data can be used as input for further post-processing, such as for joystick applications, rotary knobs, and more complex 3D position sensing applications. Unparallelled performance is achieved with this sensor, which is primarily targeting industrial and consumer applications.
mlx90393 module
Connection
| Module | STM32 Nucleo |
| VDD | 3v3 |
| Gnd | Gnd |
| SDA | SDA – D14 |
| SCL | SCL – D15 |
Code
[codesyntax lang=”cpp”]
// Distributed with a free-will license.
// Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
// MLX90393
// This code is designed to work with the MLX90393_I2CS I2C Mini Module available from ControlEverything.com.
// https://www.controleverything.com/products
#include<Wire.h>
// MLX90393 I2C Address is 0x0C(12)
#define Addr 0x0C
void setup()
{
// Initialise I2C communication as MASTER
Wire.begin();
// Initialise serial communication, set baud rate = 9600
Serial.begin(9600);
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Select Write register command
Wire.write(0x60);
// Set AH = 0x00, BIST disabled
Wire.write(0x00);
// Set AL = 0x5C, Hall plate spinning rate = DEFAULT, GAIN_SEL = 5
Wire.write(0x5C);
// Select address register, (0x00 << 2)
Wire.write(0x00);
// Stop I2C Transmission
Wire.endTransmission();
// Request 1 byte of data
Wire.requestFrom(Addr, 1);
// Read status byte
if(Wire.available() == 1)
{
unsigned int c = Wire.read();
}
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Select Write register command
Wire.write(0x60);
// Set AH = 0x02
Wire.write(0x02);
// Set AL = 0xB4, RES for magnetic measurement = 0
Wire.write(0xB4);
// Select address register, (0x02 << 2)
Wire.write(0x08);
// Stop I2C Transmission
Wire.endTransmission();
// Request 1 byte of data
Wire.requestFrom(Addr, 1);
// Read status byte
if(Wire.available() == 1)
{
unsigned int c = Wire.read();
}
delay(300);
}
void loop()
{
unsigned int data[7];
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Start single meaurement mode, ZYX enabled
Wire.write(0x3E);
// Stop I2C Transmission
Wire.endTransmission();
// Request 1 byte of data
Wire.requestFrom(Addr, 1);
// Read status byte
if(Wire.available() == 1)
{
unsigned int c = Wire.read();
}
delay(100);
// Start I2C Transmission
Wire.beginTransmission(Addr);
// Send read measurement command, ZYX enabled
Wire.write(0x4E);
// Stop I2C Transmission
Wire.endTransmission();
// Request 7 bytes of data
Wire.requestFrom(Addr, 7);
// Read 7 bytes of data
// status, xMag msb, xMag lsb, yMag msb, yMag lsb, zMag msb, zMag lsb
if(Wire.available() == 7);
{
data[0] = Wire.read();
data[1] = Wire.read();
data[2] = Wire.read();
data[3] = Wire.read();
data[4] = Wire.read();
data[5] = Wire.read();
data[6] = Wire.read();
}
// Convert the data
int xMag = data[1] * 256 + data[2];
int yMag = data[3] * 256 + data[4];
int zMag = data[5] * 256 + data[6];
// Output data to serial monitor
Serial.print("Magnetic Field in X-Axis : ");
Serial.println(xMag);
Serial.print("Magnetic Field in Y-Axis : ");
Serial.println(yMag);
Serial.print("Magnetic Field in Z-Axis : ");
Serial.println(zMag);
delay(500);
}
[/codesyntax]
Output
Open the serial monitor and you should see something like this
Magnetic Field in X-Axis : 46
Magnetic Field in Y-Axis : 65379
Magnetic Field in Z-Axis : 23
Magnetic Field in X-Axis : 60
Magnetic Field in Y-Axis : 65483
Magnetic Field in Z-Axis : 65518
Magnetic Field in X-Axis : 49
Magnetic Field in Y-Axis : 65499
Magnetic Field in Z-Axis : 65514
Magnetic Field in X-Axis : 47
Magnetic Field in Y-Axis : 65501
Magnetic Field in Z-Axis : 65506
Magnetic Field in X-Axis : 45
Magnetic Field in Y-Axis : 65505
Magnetic Field in Z-Axis : 65503
Links
https://www.melexis.com/-/media/files/documents/datasheets/mlx90393-datasheet-melexis.pdf
CJMCU-90393, MLX90393 digital 3D Holzer sensor, displacement, angle, rotation, 3D position