LCD 1602 w/ BMP280 + MQ7 + RTC

sensors.ino

#include <Wire.h>
#include "RTClib.h"
RTC_DS1307 RTC;
#include <LiquidCrystal_I2C.h>

#include <SPI.h>
#include <Adafruit_Sensor.h>
#include <Adafruit_BMP280.h>


/**********************************************************/
LiquidCrystal_I2C lcd(0x27, 16, 2); // set the LCD address to 0x27 for a 16 chars and 2 line display
/*********************************************************/
Adafruit_BMP280 bme; // I2C
/*********************************************************/
#include "MQ7.h"

MQ7 mq7(0, 5.0);// param[1] : Analog pin number, param[2] : Sensor Vcc value




// Declare lcd as a LiquidCrystal Object
int pi = 0;
int j = 0;
int k = 0;
int delayTime2 = 150; // Delay between shifts

char buffer1[20];
char buffer2[20];


void setup() {
  Serial.begin(9600);
  Serial.println("Starting test ...");
  // BMP280
  Wire.begin();
  Wire.beginTransmission(0x27);
  if (!bme.begin()) {
    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
    while (1);
  }

  // RTC
  RTC.begin();
  while (! RTC.isrunning()) {
    Serial.println("RTC is NOT running!");
    // This will reflect the time that your sketch was compiled
    RTC.adjust(DateTime(__DATE__, __TIME__));
  }
  lcd.init();
  lcd.backlight();
  lcd.home();
  lcd.clear();
}

void loop() {

  Serial.println(mq7.getPPM());
  scrollInFromRight(0, ( "CO: " + String(mq7.getPPM()) + " PPM" ).c_str()  , 0 );
  delay(2000);
  lcd.clear();
  ////
  scrollInFromRight(0, ("Tmp: " +  String(bme.readTemperature()) + " C" ).c_str()  , 0 );
  scrollInFromRight(1, ("Psr: " + String(bme.readPressure() / 100) + " hPa").c_str() , 0  );
  delay(2000);
  lcd.clear();

  //////
  DateTime now = RTC.now();

  sprintf(buffer1,  "%02d:%02d:%02d", now.hour(), now.minute(), now.second());
  sprintf(buffer2,  "%02d/%02d/%d", now.day(), now.month(), now.year());

  scrollInFromRight(0, buffer1 , 0  );
  scrollInFromRight(1, buffer2 , 0  );
  delay(2000);
  lcd.clear();


  /******************/


}




void scrollInFromRight (int line, char str1[], int mustRun) {
  if ( mustRun == 1 ) {
    // Written by R. Jordan Kreindler June 2016
    pi = strlen(str1);
    for (j = 16; j >= 0; j--) {
      lcd.setCursor(0, line);
      for (k = 0; k <= 15; k++) {
        lcd.print(" "); // Clear line
      }
      lcd.setCursor(j, line);
      lcd.print(str1);
      delay(delayTime2);
    }
  } else {
    lcd.setCursor(0,line);
    
    lcd.print(str1);
  }
}

void scrollInFromLeft (int line, char str1[]) {
  // Written by R. Jordan Kreindler June 2016
  pi = 40 - strlen(str1);
  line = line - 1;
  for (j = pi; j <= pi + 16; j++) {
    for (k = 0; k <= 15; k++) {
      lcd.print(" "); // Clear line
    }
    lcd.setCursor(j, line);
    lcd.print(str1);
    delay(delayTime2);
  }

}