Interface MLX90393 Digital Hall Sensor Module with Arduino

Contents hide

1 Introduction

2 MLX90393 Digital Hall Sensor

3 Hardware Required

4 Circuit Diagram

5 Arduino Code

6 Working Explanation

7 Code Explanation

Introduction

A Hall effect sensor is an electronic device that detects the Hall effect and converts its findings into electronic data, which can then be used to either switch a circuit on and off, offer a measurement of a fluctuating magnetic field, or be processed by an embedded computer, or be displayed on an interface. In this tutorial, we are going to Make an “Interface MLX90393 Digital Hall Sensor Module with Arduino”

MLX90393 Digital Hall Sensor

The MLX90393 module is a potent, adaptable, incredibly compact, universal 3D hall effect sensor module that fits easily into any do-it-yourself applications that need 3D position detection. With a resolution rate of 0.161uT and a maximum full-scale resolution of 44,000uT, it uses just 100uA of current. In about size, it has an incredibly strong magnetic field sensing capability that can detect even the smallest magnetic fields with ease and transmits the information via the SPI and I2C protocols. It functions as a compass sensor but also functions as a linear actuator position sensor, a flow meter with a magnetic impeller, and a non-contact controller.

Features and Specifications

Operating Voltage: 2.2 – 3.6 Volts
Sink/Source Current: 100 uA
Operating Temperature: -20⁰C – 85⁰C
16-bit ADC Resolution: 0.161 uT
Full-Scale Resolution: 44,000 uT
12C Address: 0xC0
Serial Communication Data Rate: 10 MHz
XYZT Triple-axial Position Output
Dimensions(LxWxH): 26mm x 26.3mm x 5mm

Pinouts

Pin Number	Pin Name	Descriptions
1	CS	SPI Chip select
2	MISO	SPI MISO (Master IN Slave Out)
3	MOSI	SPI MOSI (Master Out Slave In)
4	SCLK	SPI Clock input
5	3.3V	3.3V Input
6	GND	Power supply ground
7	GND	Power supply ground
8	3.3V	3.3V Input
9	SDA	I2C serial data (SDA)
10	SCL	I2C serial clock (SCL)
11	INT	Interrupt Pin
12	TRIG	TRIGGER Pin

Hardware Required

Sr. No	Components	Value	Qty
1	Arduino UNO	–	1
2	USB Cable Type A to B	–	1
3	Digital Hall Sensor	MLX90393	1
4	Jumper Wires	–	–

Circuit Diagram

Connection Table

Arduino UNO	MLX90393 Digital Hall Sensor
GND	GND
3.3v	Vcc
A4	SDA
A5	SCL

Arduino Code

#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);
}

Working Explanation

To Interface MLX90393 Digital Hall Sensor Module with Arduino, connect the circuit according to the diagram, and upload the code in Arduino. Open the Serial monitor. By monitoring the magnetic field strength, it will show the module’s position in all three dimensions at that specific moment. Adjust the module by moving it along one or more dimensions. The updated position of the module will be seen in the serial monitor.

Code Explanation

Download the library for the MLX90393 module in the Arduino IDE Include the relevant library in the code.
The void setup loop initializes the Serial monitor and I2C transmission as connections are formed to interact via the I2C interface. Set up the data’s read and write instructions.
When the status byte is set to high, the chip will read data. The data is written into the registers as soon as the 8-bit data has been read. A 9600 baud rate Serial monitor is used to show the data once it has been translated to decimal code.