OP's code, most useless comments & white space removed.
// Include starts here ##################################
#include <Wire.h>
#include <DHT.h>; // ERROR, semicolon at end of include <<<<<<<<<<<<<<<<
#include <LiquidCrystal_I2C.h>
#include <Adafruit_Sensor.h>
#include "Adafruit_BMP3XX.h"
#include "RTClib.h"
RTC_DS3231 rtc;
char daysOfTheWeek[7][12] = {"Sunday", "Monday", "Tueday", "Wednesday", "Thursday", "Friday", "Saturday"};
// Was full week day names but had to make them short to fit on LCD 4 x 20
#define SEALEVELPRESSURE_HPA (1013.25)
Adafruit_BMP3XX bmp; // I2C sensor using I2c
//Cosnstants
#define DHTPIN 7 // what pin we're connected to
#define DHTTYPE DHT22 // DHT 22 (AM2302)
DHT dht(DHTPIN, DHTTYPE); // Initialize DHT sensor for normal 16mhz Arduino
// CHANGE LCD ADDRESS TO CURRENT DISPLAY
LiquidCrystal_I2C lcd(0x27,20,4);
//Variables Start of Variables ###############################
int chk;
float bmp_temp; //Stores temperature value
float bmp_fahern; // Calculation from C to F
float dht_temp; //Stores temperature value fir DHT22
float dht_hum; //Stores humidity value for DHT22
float dht_fahern; // Calculation from C to F
float inhg; // From HPA to INHG
// Start if Setup ######################################
void setup()
{
pinMode(LED_BUILTIN,OUTPUT);
//
dht.begin();
lcd.init();// initialize the lcd
lcd.display();
lcd.backlight();
// Fake Read to prevent wrong first Data
dht_hum = dht.readHumidity();
dht_temp= dht.readTemperature();
Serial.begin(115200);
// while (!Serial);
// Serial.println("BMP388 and DTC22 test");
// Set up oversampling and filter initialization
bmp.setTemperatureOversampling(BMP3_OVERSAMPLING_8X);
bmp.setPressureOversampling(BMP3_OVERSAMPLING_4X);
bmp.setIIRFilterCoeff(BMP3_IIR_FILTER_COEFF_3);
//bmp.setOutputDataRate(BMP3_ODR_50_HZ);
// Serial.println("BtempF, BtempC, BpresM, DtempF, DtempC, Dhum%");
//
}
void loop()
{
digitalWrite(LED_BUILTIN,HIGH);
//Read data and store it to variables hum and temp
dht_hum = dht.readHumidity();
dht_temp= dht.readTemperature();
dht_fahern=(1.80 * dht_temp+32);
dht_fahern=(dht_fahern+.005);
bmp_fahern=(1.800 * bmp.temperature+32); // C Degrees to F degrees
inhg = (bmp.pressure/100 * 0.02953);
Serial.println(" --------- ");
Serial.print("BMP Temperature = ");
Serial.print(bmp_fahern);
Serial.println(" F");
Serial.print("BMP Temperature = ");
Serial.print(bmp.temperature);
Serial.println(" *C");
Serial.print("BMP Pressure = ");
Serial.print(bmp.pressure / 100.00);
Serial.println(" hPa");
Serial.print("BMP Pressure = ");
Serial.print(bmp.pressure/100 *(0.02953));
Serial.println (" inHg");
Serial.println(" ---- "); //Not for Plotter
Serial.print(" DHT Temperature = ");
Serial.print(dht_fahern);
Serial.println(" F"); lcd.print("DHT Temperature ");
Serial.print(" DHT Temperature = ");
Serial.print(dht_temp,2);
Serial.println(" C");
Serial.print(" DHT Humidity = ");
Serial.print(dht_hum,2);
Serial.println(" %");
Serial.println();
Serial.println(" ------------ ");
Serial.println();
// Get time from RTC = DateTime now = rtc.now();
//
DateTime now = rtc.now();
Serial.print("(");
Serial.print(daysOfTheWeek[now.dayOfTheWeek()]);
Serial.print(") ");
Serial.print(now.month(), DEC);
Serial.print('/');
Serial.print(now.day(), DEC);
Serial.print("/");
Serial.print(now.year(), DEC);
Serial.print(" ");
Serial.print(now.hour(), DEC);
Serial.print(':');
Serial.print(now.minute(), DEC);
Serial.print(':');
Serial.print(now.second(), DEC);
Serial.println();
Serial.print(" Bar inHg ");
Serial.println(bmp.pressure/100 *(0.02953));
Serial.println(" -------- "); // Not for Plotter
// Start of LCD Printing ########################
lcd.setCursor(0,0);
lcd.print("Temp ");
lcd.print(dht_fahern,2);
lcd.print(" F C ");
//
lcd.print(dht_temp,2);
lcd.setCursor(0,1);
lcd.print("Hum ");
lcd.print(dht_hum,2);
lcd.print("%");
lcd.setCursor(11,1);
lcd.print(" BR ");
lcd.print(inhg,2);
lcd.print("inHg");
lcd.setCursor(0,2);
lcd.setCursor(4,2);
lcd.print("[");
lcd.print(daysOfTheWeek[now.dayOfTheWeek()]);
lcd.print("]");
lcd.setCursor(1,3);
lcd.print(now.month(), DEC);
lcd.print('/');
lcd.print(now.day(), DEC);
lcd.print("/");
lcd.print(now.year(), DEC);
lcd.print(" ");
lcd.print(now.hour(), DEC);
lcd.print(':');
lcd.print(now.minute(), DEC);
lcd.print(':');
if((now.second(), DEC), DEC < 9);
lcd.setCursor(17,3);
lcd.print(now.second(), DEC);
lcd.print(" ");
// End of LCD Print ###################################
digitalWrite(LED_BUILTIN,LOW); // Turn off LED now finsishe reading
delay(10000);
}
#include <DHT.h>; // ERROR, semicolon at end of include
