Humidity_temperature (DHT11) using CAN MCP2515

Deep interesting in CAN BUS and working in this area encourage me to make a project using CAN BUS as a medium connection between two MCU. Today, i am gonna to share DHT11 temp sensor as a transmitter and give a output to serial monitor as Receiver using MCP2515.

Interesting right?:)

Code:

Transmitter :

#include <SPI.h>          //Library for using SPI Communication

#include <mcp2515.h>      //Library for using CAN Communication

#include <DHT.h>          //Library for using DHT sensor

#define DHTPIN A0       //Define DHT 11 Pin Connected to Arduino

#define DHTTYPE DHT11 //DEFINE DHTTYPE

struct can_frame canMsg;

MCP2515 mcp2515(10);      //Set the pin number where SPI CS is connected (10 by default)

DHT dht(DHTPIN, DHTTYPE);     //initilize object dht for class DHT with DHT pin with STM32 and DHT type as DHT11

void setup()

{

  while (!Serial);

  Serial.begin(9600);

 

  SPI.begin();               //Begins SPI communication

  dht.begin();               //Begins to read temperature & humidity sensor value

 

  mcp2515.reset();

  mcp2515.setBitrate(CAN_500KBPS,MCP_8MHZ); //Sets CAN at speed 500KBPS and Clock 8MHz

  mcp2515.setNormalMode();

}

void loop()

{

  int h = dht.readHumidity();       //Gets Humidity value

  int t = dht.readTemperature();    //Gets Temperature value

  canMsg.can_id  = 0x036;           //CAN id as 0x036

  canMsg.can_dlc = 8;               //CAN data length as 8

  canMsg.data[0] = h;               //Update humidity value in [0]

  canMsg.data[1] = t;               //Update temperature value in [1]

  canMsg.data[2] = 0x00;            //Rest all with 0

  canMsg.data[3] = 0x00;

  canMsg.data[4] = 0x00;

  canMsg.data[5] = 0x00;

  canMsg.data[6] = 0x00;

  canMsg.data[7] = 0x00;

  mcp2515.sendMessage(&canMsg);     //Sends the CAN message

  delay(1000);

}

Reciever:

#include <SPI.h>              //Library for using SPI Communication

#include <mcp2515.h>          //Library for using CAN Communication

struct can_frame canMsg;

MCP2515 mcp2515(10);                 // SPI CS Pin 10

void setup() {

  SPI.begin();                       //Begins SPI communication

  Serial.begin(9600);                //Begins Serial Communication at 9600 baudrate

 

  mcp2515.reset();                         

  mcp2515.setBitrate(CAN_500KBPS,MCP_8MHZ); //Sets CAN at speed 500KBPS and Clock 8MHz

  mcp2515.setNormalMode();                  //Sets CAN at normal mode

}

void loop()

{

  if (mcp2515.readMessage(&canMsg) == MCP2515::ERROR_OK) // To receive data (Poll Read)

  {

     int x = canMsg.data[0];        

     int y = canMsg.data[1];

    

    Serial.print("Data from ID: 0x");

    Serial.print(canMsg.can_id, HEX);

    Serial.print(" ");

    Serial.print("DLC : ");

    Serial.print(canMsg.can_dlc);

    Serial.print(" ");

    Serial.print("DATA : ");

    Serial.print(canMsg.data[0]);

    Serial.print(" ");

    Serial.print(canMsg.data[1]);

    Serial.print(" ");

    Serial.print(canMsg.data[2]);

    Serial.print(" ");

    Serial.print(canMsg.data[3]);

    Serial.print(" ");

    Serial.print(canMsg.data[4]);

    Serial.print(" ");

    Serial.print(canMsg.data[5]);

    Serial.print(" ");

    Serial.print(canMsg.data[6]);

    Serial.print(" ");

    Serial.print(canMsg.data[7]);

    Serial.print("\n");

   

    Serial.print("Current humidity = ");   

    Serial.print(x);

    Serial.print("%  ");

    Serial.print("temperature = ");

    Serial.print(y);

    Serial.println("C  ");

    }

}

Output: