Weather station with BME280

1//WEATHER STATION WITH ARDUINO NANO AND BME280 V2.0
2//IN THIS VERSION DELAY IS ACOMPLISHED WITH MILLIS FUNCTION AND THERE IS PUSHBUTTON THAT CONTROLS THE DISPLAY MODE
3
4//THERE IS A SECOND PUSHBUTTON THAT CONTROLS LCD BACKLIGHT. EVERYTIME IS PRESSED BACKLIGHT IS ON FOR 10''
5//BUTTONS ARE CONTROLLED WITH THE EZBUTTON LIBRARY
6
7#include <ezButton.h>
8#include <LiquidCrystal.h>
9#include <Wire.h>
10#include <Adafruit_Sensor.h>
11#include <Adafruit_BME280.h>
12
13
14float temp;                                     //VARIABLE FOR MEASURING TEMPERATURE
15float humid;                                    //VARIABLE FOR MEASURING HUMIDITY
16float pressure;                                 //VARIABLE FOR MEASURING PRESSURE
17int mode = 0;                                   //VARIABLE FOR DISPLAY MODE. VALUE DEPENDS FROM PUSHBUTTON PRESSINGS. MODE=0 SEQUENSE -- MODE=1 TEMPERATURE -- MODE=2 HUMIDITY -- MODE=3 PRESSURE
18int whatToPrint = 0;                            //VARIABLE FOR CHECKING WHAT TO PRINT IN SEQUENCE MODE
19
20
21ezButton button1(5);                            // create ezButton object that attach to pin 5; CONNECT PUSHBUTTON FOR CONTROL LCD BACKLIGHT
22ezButton button2(7);                            // create ezButton object that attach to pin 7; CONNECT PUSHBUTTON FOR DISPLAY MODE
23
24int BKL_out = 4;                                //OUTPUT FOR CONTROLLING LCD BACKLIGHT THROUGH NPN TRANSISTOR
25int state = 0;                                  //VARIABLE FOR BACKLIGHT
26
27unsigned long prevTime_T1 = 0;
28unsigned long prevTime_T2 = 0;
29unsigned long prevTime_T3 = 0;
30
31
32long interval_T1 = 3000;                        //DISPLAY TIME 3''
33long interval_T2 = 5000;                        //SEND DATA VIA SERIAL EVERY 5''
34long interval_T3 = 10000;                       //LCD BACKLIGHT ON TIME 10''
35
36const int RS=2, E=3, D4=8, D5=9, D6=10, D7=11;  // CONNECTION OF LCD TO ARDUINO /ΣΥΝΔΕΩ ΤΑ PIN ΤΗΣ LCD ΟΘΟΝΗΣ ΣΤΑ PIN TOY ARDUINO
37
38LiquidCrystal lcd(RS,E,D4,D5,D6,D7);          //LCD INITIALIZATION / ΑΡΧΙΚΟΠΟΙΗΣΗ ΟΘΟΝΗΣ
39
40Adafruit_BME280 bme; // I2C
41                    //Adafruit_BMP280 bme(BMP_CS); // hardware SPI
42                    //Adafruit_BMP280 bme(BMP_CS, BMP_MOSI, BMP_MISO,  BMP_SCK);
43
44void setup() {
45
46  pinMode (BKL_out,OUTPUT);
47  lcd.begin(16,2);            //LCD 16 COLUMΝS 2 ROWS / ΑΡΧΙΚΟΠΟΙΣΗ ΟΘΟΝΗΣ ΣΤΗΛΕΣ=16 ΓΡΑΜΜΕΣ=2
48  Serial.begin(9600);         //BEGIN SERIAL COMMUNICATION / ΕΝΑΡΞΗ ΣΕΙΡΙΑΚΗΣ ΕΠΙΚΟΙΝΩΝΙΑΣ
49  Serial.println(F("BMP280 test"));
50  
51  if (!bme.begin()) {  
52    Serial.println("Could not find a valid BMP280 sensor, check wiring!");
53    while (1);
54  }
55  button1.setDebounceTime(50); // set debounce time to 50 milliseconds
56  button2.setDebounceTime(50); // set debounce time to 50 milliseconds
57
58
59  lcd.clear();
60  lcd.setCursor(0,0);               //DEFINE LCD CURSOR POSITION
61  lcd.print("WEATHER STATION");     //PRINT WELCOME MESSAGE
62  lcd.setCursor(1,3);
63  lcd.print(" Version:2.0");
64  delay(5000);
65
66
67}
68
69void loop() {
70
71  button1.loop(); // MUST call the loop() function first
72  button2.loop(); // MUST call the loop() function first
73
74  unsigned long currentTime = millis();
75
76  
77  temp = bme.readTemperature();         //READ AND STORE TEMPERATURE
78  delay(10);
79  humid = bme.readHumidity();           //READ AND STORE HUMIDITY
80  delay(10);
81  pressure = bme.readPressure()/100;    //DIVIDE WITH 100 TO GET hPa
82  delay(10);
83
84  if(currentTime - prevTime_T2 > interval_T2){
85  String message = (String) "Humidity: "+humid+"%  Temperature: " +temp+"°C  Pressure: " +pressure+"hPa";
86  Serial.println(message);
87  prevTime_T2 = currentTime;
88    }
89  
90
91  if(button1.isPressed()){                  //CHECK IF PUSHBUTTON FOR BACKLIGHT IS PRESSED
92  digitalWrite (BKL_out, HIGH);             //BACKLIGHT ON
93  state=1;                                  //VARIABLE FOR BACKLIGHT SET TO 1
94  prevTime_T3=currentTime;                  //WRITE TO VARIABLE WHAT TIME THE BACKLIGHT PUSHBUTTON WAS PRESSED
95  Serial.println("state=1");
96  Serial.println(prevTime_T3);
97  }
98    
99  if(state==1){                                 //IF BACKLIGHT IS ON 
100  if(currentTime - prevTime_T3 > interval_T3){  //AND IF 10'' HAS PASSED
101  digitalWrite (BKL_out, LOW);                  //TURN OFF BACKLIGHT  
102  state=0;                                      //VARIABLE FOR BACKLIGHT SET TO 0      
103  Serial.println("turn off BACKLIGHT");
104  prevTime_T3 = currentTime;
105  }
106  }
107
108    if(button2.isPressed())                     //IF BUTTON FOR DISPLAY MODE IS PRESSED      
109     mode++;                                    //INCREASE VARIABLE FOR DISPLAY MODE
110    if (mode==4){                               //CHECK IF VARIABLE IS 4  
111      mode = 0;                                 //SET IT TO 0
112    } 
113
114
115  if(mode == 0){                                  //IF VARIABLE IS 0
116    if(currentTime - prevTime_T1 > interval_T1){  //AND IF 3'' HAS PASSED 
117      whatToPrint++;                              //INCREASE THE VARIABLE WHATTOPRINT
118      if(whatToPrint == 3){
119        whatToPrint = 0;
120      }
121      prevTime_T1 = currentTime;
122    }
123    
124//PRINT TEMPERATURE   
125  if(whatToPrint == 0){
126
127  lcd.clear();
128  lcd.setCursor(0,0);               //DEFINE LCD CURSOR POSITION
129  lcd.print("Temperature");         //PRINT TEXT
130  //delay(20);
131  lcd.setCursor(0,1);
132  lcd.print("T=");
133  lcd.setCursor(2,1);
134  lcd.print(temp);
135  lcd.setCursor(8,1);
136  lcd.print("C");
137  }
138
139//PRINT HUMIDITY
140  if(whatToPrint == 1){
141
142  lcd.clear();
143  lcd.setCursor(0,0);               //DEFINE LCD CURSOR POSITION
144  lcd.print("Humidity");            //PRINT TEXT
145  //delay(20);
146  lcd.setCursor(0,1);
147  lcd.print("H=");
148  lcd.setCursor(2,1);
149  lcd.print(humid);
150  lcd.setCursor(8,1);
151  lcd.print("%");
152  }
153
154//PRINT PRESSURE
155  if(whatToPrint ==2){
156
157  lcd.clear();
158  lcd.setCursor(0,0);               //DEFINE LCD CURSOR POSITION
159  lcd.print("Barometric pres");       //PRINT TEXT
160  //delay(20);  
161  lcd.setCursor(0,1);
162  lcd.print("P=");
163  lcd.setCursor(2,1);
164  lcd.print(pressure);
165  lcd.setCursor(10,1);
166  lcd.print("hPa");
167  }
168
169}
170
171  if(mode == 1){
172  lcd.clear();
173  lcd.setCursor(0,0);               //DEFINE LCD CURSOR POSITION
174  lcd.print("Temperature");         //PRINT TEXT
175  //delay(20);
176  lcd.setCursor(0,1);
177  lcd.print("T=");
178  lcd.setCursor(2,1);
179  lcd.print(temp);
180  lcd.setCursor(8,1);
181  lcd.print("C");
182    }
183
184  if(mode == 2){
185  lcd.clear();
186  lcd.setCursor(0,0);               //DEFINE LCD CURSOR POSITION
187  lcd.print("Humidity");            //PRINT TEXT
188  //delay(20);
189  lcd.setCursor(0,1);
190  lcd.print("H=");
191  lcd.setCursor(2,1);
192  lcd.print(humid);
193  lcd.setCursor(8,1);
194  lcd.print("%");  
195  }
196
197  if(mode == 3){
198  lcd.clear();
199  lcd.setCursor(0,0);               //DEFINE LCD CURSOR POSITION
200  lcd.print("Barometric pres");       //PRINT TEXT
201  //delay(20);  
202  lcd.setCursor(0,1);
203  lcd.print("P=");
204  lcd.setCursor(2,1);
205  lcd.print(pressure);
206  lcd.setCursor(10,1);
207  lcd.print("hPa");
208  }  
209}