#include <SPI.h>          //Library for using SPI Communication 
#include <mcp2515.h>      //Library for using CAN Communication (https://github.com/autowp/arduino-mcp2515/)
#include <DHT.h>          //Library for using DHT sensor 

#define DHTPIN 2
#define DHTTYPE DHT11

struct can_frame canMsg;

MCP2515 mcp2515(5);

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 sesnor 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);
}