Varul Jain
Published

Detect Magnetic Field and Current Direction Using MMC2460MT

The MMC2460MT I2C module is already used in magnetic compass applications, but it's very useful in industrial applications as well.

BeginnerFull instructions provided2 hours953
Detect Magnetic Field and Current Direction Using MMC2460MT

Things used in this project

Hardware components

National Control Devices esp32
×1
National Control Devices MMC2460MT I2C Sensor
×1

Software apps and online services

Arduino IDE
Arduino IDE
Node-RED
Node-RED

Story

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Code

MMC2460MT_ESP32_MQTT

C/C++
#include <Wire.h>
#include <PubSubClient.h>
#include <WiFi.h>

// BMP280 I2C address is 0x76(108)
#define Addr 0x30

//Wifi Credentials
#define wifi_ssid "SSID"
#define wifi_password "Password"

//Define MQTT server and topics
#define mqtt_server "iot.eclipse.org"
#define X_topic "X_Axis"
#define Y_topic "Y_Axis"

WiFiClient espClient;
PubSubClient client;

volatile float X_top, Y_top;
void setup()
{
  Wire.begin(21, 22);
  Serial.begin(115200);
  Serial.println("RX Pin --->" + RX);
  Serial.println("TX Pin --->" + TX);
  setup_wifi();
  client.setServer(mqtt_server, 1883);
  client.setClient(espClient);
}

//Wifi Setup
void setup_wifi() {
  delay(10);
  // We start by connecting to a WiFi network
  Serial.println();
  Serial.print("Connecting to ");
  Serial.println(wifi_ssid);

  WiFi.begin(wifi_ssid, wifi_password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("");
  Serial.println("WiFi connected");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
}

//Reconnect
void reconnect() {
  // Loop until we're reconnected
  while (!client.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (client.connect("ESP32Client")) {
      Serial.println("connected");
    }
    else {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(500);
    }
  }
}

void loop()
{
  MMC2460();
  delay(100);

  if (!client.connected()) {
    reconnect();
  }

  //Mentioned below directly executed in String url

  Serial.print("X Axis: ");
  Serial.println(String(X_top).c_str());
  client.publish(X_topic, String(X_top).c_str(), true);

  Serial.print("Y Axis: ");
  Serial.println(String(Y_top).c_str());
  client.publish(Y_topic, String(Y_top).c_str(), true);

  
  client.loop();
}

void MMC2460()
{
  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Select command register 0
  Wire.write(0x07);
  // Send measurement command
  Wire.write(0x23);
  // Stop I2C Transmission
  Wire.endTransmission();

  unsigned int data[4];
  // Start I2C Transmission
  Wire.beginTransmission(Addr);
  // Select data register
  Wire.write(0x00);
  // Stop I2C Transmission
  Wire.endTransmission();

  // Request 4 byte of data
  Wire.requestFrom(Addr, 4);

  // xMag lsb, xMag msb, yMag lsb, yMag msb
  if (Wire.available() == 4)
  {
    data[0] = Wire.read();
    data[1] = Wire.read();
    data[2] = Wire.read();
    data[3] = Wire.read();
    delay(100);
  }
  delay(300);

  // Convert the values
  int xMag = ((data[1] * 256) + data[0]);
  int yMag = ((data[3] * 256) + data[2]);

  // 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);
  delay(1000);

  X_top = xMag;
  Y_top = yMag;
}

MMC2460MT_ESP32_Node-Red

Credits

Varul Jain

Varul Jain

12 projects • 13 followers
Beginner, Creator, IOT Developer, working with IOT Prototypes

Comments

Related channels and tags
  • National Control Devices
  • Node-RED
  • Robotics
  • Sensors