A simple barometer with BME280, DIY arduino and DWIN display

#include <Wire.h>
#include "Seeed_BME280.h"
 
#define SEALEVELPRESSURE_HPA (1013.25)
BME280 bme280;
 
//float a; 
/* Adresses of all sensors */
/*unsigned char Buffer[9];
#define temperature_add   0x11
#define humidity_add     0x12
#define pressure_add   0x63
#define dewpoint_add     0x64
 
unsigned char   Temperature[8] = {0x5a, 0xa5, 0x05, 0x82, temperature_add , 0x00, 0x00, 0x00};
unsigned char      Humidity[8] = {0x5a, 0xa5, 0x05, 0x82, humidity_add, 0x00, 0x00, 0x00};
unsigned char   Pressure[8] = {0x5a, 0xa5, 0x05, 0x82, pressure_add , 0x00, 0x00, 0x00};
unsigned char      DewPoint[8] = {0x5a, 0xa5, 0x05, 0x82, dewpoint_add, 0x00, 0x00, 0x00};
*/ 
 
void setup()
{
  Serial.begin(115200);
  if(!bme280.init()){
   Serial.println("Device error!");
  }
}
 
 
void loop()
{
  sensor_data();
  delay(1000);

}
 
 
void sensor_data()
{
  float t = bme280.getTemperature();
  int h = bme280.getHumidity();
  int p = bme280.getPressure() / 100.0F;

  /*------Print data to Serial Monitor------*/
/* Serial.print("Temperature = ");
  Serial.print(a);
  Serial.println(" C");
 
  Serial.print("Humidity = ");
  Serial.print(h);
  Serial.println(" %");
 
  Serial.print("Pressure = ");
  Serial.print(p);
  Serial.println(" hPa");
*/
 sendFloatNumber(t,0x11);
 sendIntNumber(h,0x12);
 sendIntNumber(p,0x13);
 /*
  Temperature[6] = highByte(t);
  Temperature[7] = lowByte(t);
  Serial.write(Temperature, 8);
/* 
  Humidity[6] = highByte(h);
  Humidity[7] = lowByte(h);
  Serial.write(Humidity, 8);
 
  Pressure[6] = highByte(p);
  Pressure[7] = lowByte(p);
  Serial.write(Pressure, 8);
*/
}

void sendFloatNumber(float floatvalue,byte address)
{
  Serial.write(0x5A);
  Serial.write(0xA5);
  Serial.write(0x07);
  Serial.write(0x82);
  Serial.write(address);
  Serial.write(0x00);

  byte hex[4]={0};

  FloatToHex(floatvalue,hex);

  Serial.write(hex[3]);
  Serial.write(hex[2]);
  Serial.write(hex[1]);
  Serial.write(hex[0]);
  
  }

void sendIntNumber(int intvalue, byte address)
{
  Serial.write(0x5A);
  Serial.write(0xA5);
  Serial.write(0x05);
  Serial.write(0x82);
  Serial.write(address);
  Serial.write(0x00);

  byte hex[2]={0};

  IntToHex(intvalue,hex);

  Serial.write(hex[1]);
  Serial.write(hex[0]);
  
  }
void FloatToHex(float f,byte* hex)
{
  byte* f_byte=reinterpret_cast<byte*>(&f);
  memcpy(hex,f_byte,4);
}

void IntToHex(int f,byte* hex)
{
  byte* f_byte=reinterpret_cast<byte*>(&f);
  memcpy(hex,f_byte,2);
}