Wiring the MELEXIS MLX90324 Magnetic Hall Effect Monolithic Rotation Sensor with ESP32

This is the MLX90324 Magnetic Hall Effect Monolithic Touchless Rotation Sensor developed by MELEXIS Semiconductor. This MLX90324 is a sensor that uses its signature called TriaXis Hall Technology means that it uses a magnetic force to drive this sensor. moreover, a conventional planar Hall technology is only sensitive to the flux density applied to the chip surface however, this sensor is also sensitive to flux density applied parallel to the chip surface. this will be obtained through an integrated magneto-concentration (IMC) which is deposited to the CMOS as an additional back-end.

The MLX90324 is only sensitive to the flux density complanar at the chip surface. This will allow the MLX90324 to manage the correct magnetic circuit to decode the absolute rotating angular position from 0 to 360 degrees enabling this chip to be a next-generation of non-contact rotary position sensor or potentiometer this design is very crucial to automotive and industrial and marine applications. The MLX90324 produces an output signal proportional to the decoded angle this output is selectable between Analog and SENT or SAE-j2716 protocol. For more technical detail and further readings please refer to the datasheet below.

Requirements

Arduino IDE | PlatformIO
Test Boards :
- Note: The Diagram below is using ESPRESSIF ESP32-VROOM-32D (please refer to your MCU’s respective pin-outs & bus configuration)
MLX90324 Rotary Position Sensor
TS78L05CX Voltage Regulator /Alternative SOT-23 5v Regulator
Resistors (See below diagram for required value & alternatives package)
Capacitor(See below diagram for required value & alternatives package)

Wiring Diagram / Schematics

Sketch Source Code

const int AXISREAD = 34; //GPIO 34 (Analog ADC1_CH6) 
int AXISVAL = 0;
void setup() {
  Serial.begin(115200);
  Serial.print("14CORE | MLX90324 Test Code");
  Serial.print("Initializing please wait..........");
  delay(2000);
}

void loop() {
  potValue = analogRead(AXISREAD);
  Serial.println(AXISVAL);
  delay(500);
}

const int AXISREAD = 34; //GPIO 34 (Analog ADC1_CH6)

int AXISVAL = 0;

void setup() {

Serial.begin(115200);

Serial.print("14CORE | MLX90324 Test Code");

Serial.print("Initializing please wait..........");

delay(2000);

}

void loop() {

potValue = analogRead(AXISREAD);

Serial.println(AXISVAL);

delay(500);

}

MicroPython Source Code

from machine import Pin, ADC
from time import sleep

AXIS = ADC(0) //Set pin ADC 34

while True:
  AXISVAL = AXIS.read()
  print(AXISVAL)
  sleep(0.1)

from machine import Pin, ADC

from time import sleep

AXIS = ADC(0) //Set pin ADC 34

while True:

AXISVAL = AXIS.read()

print(AXISVAL)

sleep(0.1)

Java Source Code

@Override
public double getValue(Pin pin) {
  // the getMode() will validate the pin exists with the hasPin() function
  PinMode mode = getMode(pin);
  // handle analog input reading for Odroid boards
  if (mode == PinMode.ANALOG_INPUT) {
    // read latest analog input value from WiringPi
    // we need to re-address the pin for Odroid boards (analog_address = assigned_pin_address - AIN_ADDRESS_OFFSET)
    double value = com.pi4j.wiringpi.Gpio.analogRead(pin.getAddress() - AIN_ADDRESS_OFFSET);
    // cache latest analog input value
    getPinCache(pin).setAnalogValue(value);
    // return latest analog input value
    return value;
  }
  return super.getValue(pin);
}

@Override

public double getValue(Pin pin) {

// the getMode() will validate the pin exists with the hasPin() function

PinMode mode = getMode(pin);

// handle analog input reading for Odroid boards

if (mode == PinMode.ANALOG_INPUT) {

// read latest analog input value from WiringPi

// we need to re-address the pin for Odroid boards (analog_address = assigned_pin_address - AIN_ADDRESS_OFFSET)

double value = com.pi4j.wiringpi.Gpio.analogRead(pin.getAddress() - AIN_ADDRESS_OFFSET);

// cache latest analog input value

getPinCache(pin).setAnalogValue(value);

// return latest analog input value

return value;

}

return super.getValue(pin);

}

PCB Milling / Gerber

Download PCB Milling File | MLX90324
Download 14CORE-MLX90324 Schematics | JPG
Download Gerber Viewer | Windows | Linux

Downloads

Download MLX90324 Datasheet | PDF

Wiring the MELEXIS MLX90324 Magnetic Hall Effect Monolithic Rotation Sensor with ESP32