Multiple Slaves with SPI (MLX90333 Sensors and Arduino Micro)

Projects Networking, Protocols, and Devices
10

The ground is there I just forgot to draw it in that schematic!

Here is my updated code:

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

//*******Arduino MICRO SPI pins********
 
#define SS 10
#define SS1 2

byte dataBuffer[16];

void setup() {
  Serial.begin(9600); 
  SPI.begin;
  pinMode(SS1, OUTPUT);

  digitalWrite(SS1, HIGH);
  digitalWrite(SS, HIGH);

}

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(65535);  // Must transfer 1's, 0's don't work
      }
    digitalWrite(SS, HIGH);
    digitalWrite(SS1, LOW);
    delay(20);  //Short delay necessary here
    for (i=8; i<16; i++){ 
      dataBuffer[i] = SPI.transfer(65535);  // Must transfer 1's, 0's don't work
      }
    digitalWrite(SS1, HIGH);
    
    SPI.endTransaction();
    Serial.print(dataBuffer[2],16); //Print 3rd byte, MSB for Alpha
    Serial.print(" ,");
    Serial.print(dataBuffer[4],16); //Print 5th byte, MSB for Beta
    Serial.print(" ,");
    Serial.print(dataBuffer[10],16); //Print 3rd byte, MSB for Alpha
    Serial.print(" ,");
    Serial.print(dataBuffer[12],16); //Print 5th byte, MSB for Beta
    Serial.println(" ,");
    }

  }

Let me know if the changes made were the proper changes.

I am still seeing all zeros on the serial plotter. However, when hooking the 'scope up I see a definite voltage fluctuation on the MOSI, MISO, SCK, /SS, and even the Pin 2 (sensor 2's SS line) when the magnet is over the first sensor. When I put the /SS over the second sensor I see a voltage fluctuation in the all the pins as well.

Note that the idle voltage at the SS pin is 2.7mV where the voltage at Pin 2 is 3.9V.

I'm not sure if some of this information is valuable or not I'm trying to relay as much info as possible with out making the message too long!

Let me know what you think!