MLX90333 Sensor with Arduino Micro: reading Alpha-Beta, wanting X-Y-Z

Other Hardware Sensors
1

Hey guys, below is a piece of code that I have been changing to fit my needs on running multiple MLX90333 sensors. The code currently reads the alpha and beta angles of a magnetic field orientation and I would like it to read x-y-z positioning. There is direction in the spec sheet on how to read x-y-z but I am not sure how to translate it to my code.

Can anyone give me direction?

Here is my code:

#include <SPI.h>
#include <stdint.h>

//*******Arduino MICRO SPI pins********
 
#define SS1 2

byte dataBuffer[8];

void setup() { 
  
  pinMode(SS1, OUTPUT);
  pinMode(SS, OUTPUT);

  digitalWrite(SS1, HIGH);
  digitalWrite(SS, HIGH);
  Serial.begin(9600); 
  SPI.begin;
}

void loop() {

  //Sensor 1
  delay(20); //MLX90333 startup takes 16ms
  SPI.beginTransaction(SPISettings(160000, MSBFIRST, SPI_MODE1)); //320000 is about max
  delay(5);
  int j;
  
  for (j=0; j<10; j++){
    digitalWrite(SS, LOW);
    delay(20);  //Short delay necessary here
    int i;
    for (i=0; i<8; i++){ 
      dataBuffer[i] = SPI.transfer(255);  // Must transfer 1's, 0's don't work
      }
    digitalWrite(SS, HIGH);

    
    SPI.endTransaction();
    Serial.print(dataBuffer[2],8); //Print 3rd byte, MSB for Alpha
    Serial.print(", ");
    Serial.print(dataBuffer[4],8); //Print 5th byte, MSB for Beta
    Serial.print(", ");
    }

  //Sensor 2
  delay(20); //MLX90333 startup takes 16ms
  SPI.beginTransaction(SPISettings(160000, MSBFIRST, SPI_MODE1)); //320000 is about max
  delay(5);

  
  for (j=0; j<10; j++){
    digitalWrite(SS1, LOW);
    delay(20);  //Short delay necessary here
    int i;
    for (i=0; i<8; i++){ 
      dataBuffer[i] = SPI.transfer(255);  // Must transfer 1's, 0's don't work
      }
    digitalWrite(SS1, HIGH);

    delay(1000);
    SPI.endTransaction();
    Serial.print(dataBuffer[2],8); //Print 3rd byte, MSB for Alpha
    Serial.print(", ");
    Serial.print(dataBuffer[4],8); //Print 5th byte, MSB for Beta
    Serial.print(", ");
    }

  }

Here is a link to the spec sheet. Special attention to page 20.

MLX90333 Spec Sheet

Thanks to anyone who can help me!

2

The link to the datasheet does not work.

3

Here, try this one.

MLX90333-Datasheet-Melexis (6).PDF (875 KB)

4

I cannot find the slightest hint in the datasheet about how to set these parameters.

There is also no definition about the addresses of the different paramters. Given the description of the serial protocol the only way to set something is to send data after the first 8 bytes were read. But without a description of the process this probably won't ever be successful.

The only mentioning I found is a German documentation of how to program the chip. You should use a hardware from Melexis and a Windows software to set these parameters. I'm quite sure that there is another way to do this but it seems that Melexis is keeping that secret. Might be the time to write to them and ask.