#include <SPI.h> //include Serial Peripheral Interface library
#include <Wire.h> //include Two Wire Interface library
#include <Adafruit_GFX.h> // include Adafruit graphics library
#include <Adafruit_ST7735.h> // include Adafruit ST7735 TFT library
#include <Adafruit_BMP280.h> // include Adafruit BMP280 sensor library
#include "DHT.h" //include DHTXX sensor library
#define DHTPIN 2 //DHT11 data pin connected to arduino pin D2
#define DHTTYPE DHT11 //specifying the type of DHT sensor used
#define TFT_RST 8 // TFT RST pin is connected to arduino pin D8
#define TFT_CS 10 // TFT CS pin is connected to arduino pin D9
#define TFT_DC 9 // TFT DC pin is connected to arduino pin D10
// initialize ST7735 SERIES TFT library
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
// define device I2C address: 0x76 or 0x77 (0x77 is the library default address)
#define BMP280_I2C_ADDRESS 0x76
Adafruit_BMP280 bmp280; // initialize Adafruit BMP280 library
DHT dht(DHTPIN, DHTTYPE); // initialize DHT sensor
void setup(void)
{
dht.begin(); // synchronizing DHT sensor
tft.initR(INITR_144GREENTAB); // initialize a ST7735S chip, black tab
tft.fillScreen(ST77XX_BLACK); // setting black background
tft.drawFastHLine(0, 15 , tft.width(), ST77XX_CYAN);// draw horizontal seperation line at position (0, 15)
tft.setTextColor(ST77XX_CYAN, ST77XX_BLACK); // set text color to white and black background
tft.setTextSize(1); // setting text size to 1
//tft.setCursor(4, 0); // move cursor to position (4, 0) pixel
//tft.print("ARDUINO + ST7735 TFT");
tft.setCursor(25, 5); // move cursor to position (25, 5) pixel
tft.print("WEATHER BUDDY");
// initialize the BMP280 sensor
if( bmp280.begin(BMP280_I2C_ADDRESS) == 0 )
{ // connection error or device address wrong!
tft.setTextColor(ST77XX_RED, ST77XX_CYAN); // set text color to red and black background
tft.setTextSize(2); // setting text size to 2
tft.setCursor(5, 76); // move cursor to position (5, 76) pixel
tft.print("Connection");
tft.setCursor(35, 100); // move cursor to position (35, 100) pixel
tft.print("Error");
while(1); // stay here
}
tft.drawFastHLine(0, 55, tft.width(), ST77XX_CYAN); // draw horizontal seperation line at position (0, 55)pixel
tft.drawFastHLine(0, 95, tft.width(), ST77XX_CYAN); // draw horizontal seperation line at position (0, 195)pixel
tft.setTextColor(ST77XX_RED, ST77XX_BLACK); // set text color to red and black background
tft.setCursor(30, 20); // move cursor to position (30, 20) pixel
tft.print("TEMPERATURE "); // setting heading for first section
tft.setTextColor(ST77XX_CYAN, ST77XX_BLACK); // set text color to cyan and black background
tft.setCursor(40, 60); // move cursor to position (40, 60) pixel
tft.print("HUMIDITY "); // setting heading for second section
tft.setTextColor(ST77XX_GREEN, ST7735_BLACK); // set text color to green and black background
tft.setCursor(40, 100); // move cursor to position (40, 100) pixel
tft.print("PRESSURE "); // setting heading for third section
tft.setTextSize(2); // setting text size to 2
}
// main loop
void loop()
{
char _buffer[8];
// read temperature, humidity and pressure from the BMP280 sensor
float temp = bmp280.readTemperature(); // get temperature in °C
float hum = dht.readHumidity(); // get humidity in rH%
float pres = bmp280.readPressure(); // get pressure in hPa
// print temperature (in °C)
if(temp < 0) // if temperature < 0
sprintf( _buffer, "-%02u.%02u", (int)abs(temp), (int)(abs(temp) * 100) % 100 );
else // if temperature >= 0
sprintf( _buffer, " %02u.%02u", (int)temp, (int)(temp * 100) % 100 );// setting the value approximation
tft.setTextColor(ST77XX_YELLOW, ST77XX_BLACK); // set text color to yellow and black background
tft.setCursor(11, 34); // move cursor to position (11,34) pixel
tft.print(_buffer); // print temperature from BMP-280 sensor
tft.drawCircle(89, 34, 2, ST77XX_YELLOW); // print the degree symbol ( ° )(can be omitted if * is used instead)
tft.setCursor(95, 34); // move cursor to position (95,34) pixel
tft.print("C"); // print the Celcius symbol
// 2: print humidity (in %)
sprintf( _buffer, "%02u ", (int)(hum)); // setting the value approximation
tft.setTextColor(ST77XX_MAGENTA, ST77XX_BLACK); // set text color to magenta and black background
tft.setCursor(45, 74); // move cursor to position (45,74) pixel
tft.print(_buffer); // print humidity from DHT-11 sensor
tft.setCursor(75, 74); // move cursor to position (75,74) pixel
tft.print("%"); // print the percentage symbol
// 3: print pressure (in hPa)
sprintf( _buffer, "%04u.%02u", (int)(pres/100), (int)((uint32_t)pres % 100) ); // setting the value approximation
tft.setTextColor(ST77XX_ORANGE, ST77XX_BLACK); // set text color to orange and black background
tft.setCursor(3, 112); // move cursor to position (3,112)pixel
tft.print(_buffer); // print atmospheric pressure from BMP-280
tft.setCursor(91, 112); // move cursor to position (91,112)pixel
tft.print("hPa"); // print unit of atmospheric pressure as hecto pascal
delay(1000); // wait 1 second before taking next sensor reading
}
