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

* Interfacing Arduino with ST7789 TFT display (240x240 pixel)

* and DHT11 digital humidity & temperature sensor.

* https://sites.google.com/view/electrodevelo/home-page

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

#include <Adafruit_GFX.h> // Adafruit core graphics library

#include <Adafruit_ST7789.h> // Adafruit hardware-specific library for ST7789

#include <DHT.h> // Adafruit DHT library code

int LED = 2;

int buttonA = 4; //GASnatural

int buttonB = 5; //GAS

int buttonC = 6; //FIER

int buttonD = 7; //SMOKE

int BUTTONstate1 = 0;

int BUTTONstate2 = 0;

int BUTTONstate3 = 0;

int BUTTONstate4 = 0;

// ST7789 TFT module connections

#define TFT_CS 10 // define chip select pin

#define TFT_DC 8 // define data/command pin

#define TFT_RST 9 // define reset pin, or set to -1 and connect to Arduino RESET pin

// initialize Adafruit ST7789 TFT library with hardware SPI module

// MOSI(SDA) ---> Arduino digital pin 11

// SCK (SCL) ---> Arduino digital pin 13

Adafruit_ST7789 tft = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_RST);

#define DHTPIN A2 // DHT11 data pin is connected to Arduino analog pin 2

#define DHTTYPE DHT11 // DHT11 sensor is used

DHT dht11(DHTPIN, DHTTYPE); // initialize DHT library

void setup(void) {

pinMode(LED, OUTPUT);

pinMode(buttonA, INPUT);

pinMode(buttonB, INPUT);

pinMode(buttonC, INPUT);

pinMode(buttonD, INPUT);

// initialize the ST7789 display (240x240 pixel)

// if the display has CS pin try with SPI_MODE0

tft.init(240, 240, SPI_MODE2);

// if the screen is flipped, remove this command

tft.setRotation(1);

// fill the screen with black color

tft.fillScreen(ST77XX_BLACK);

tft.setTextWrap(false); // turn off text wrap option

tft.setTextColor(ST77XX_GREEN, ST77XX_BLACK); // set text color to green and black background

tft.setTextSize(3); // text size

tft.setCursor(15, 20); // move cursor to position pixel

tft.print("TEMPERATURE:");

tft.setTextColor(ST77XX_YELLOW, ST77XX_BLACK); // set text color to yellow and black background

tft.setCursor(43, 140); // move cursor to position pixel

tft.print("HUMIDITY:");

tft.setTextSize(5); // text size

// initialize DHT11 sensor

dht11.begin();

}

char _buffer[7];

// main loop

void loop() {

delay(1000); // wait a second

digitalWrite(LED,LOW);// power on the led on pin 2

digitalWrite(buttonA,HIGH);

digitalWrite(buttonB,HIGH);

digitalWrite(buttonC,HIGH);

digitalWrite(buttonD,HIGH);

// read humidity in rH%

int Humi = dht11.readHumidity() * 10;

// read temperature in degrees Celsius

int Temp = dht11.readTemperature() * 10;

// print temperature (in °C)

tft.setTextColor(ST77XX_CYAN, ST77XX_BLACK); // set text color to red with black background

if(Temp < 0) // if temperature < 0

sprintf(_buffer, "-%02u.%02u", (abs(Temp)/10)%100, abs(Temp) % 10);

else // temperature >= 0

sprintf(_buffer, "%02u.%02u", (Temp/10)%100, Temp % 10);

tft.setCursor(20, 71);

tft.print(_buffer);

tft.drawCircle(181, 77, 4, ST77XX_CYAN); // print degree symbol ( ° )

tft.setCursor(190,71);

tft.print("C");

// print humidity (in %)

tft.setTextColor(ST77XX_CYAN, ST77XX_BLACK); // set text color to cyan and black background

sprintf(_buffer, "%02u.%02u%%", (Humi/10)%100, Humi % 100);

tft.setCursor(30, 181);

tft.print(_buffer);

BUTTONstate1 = digitalRead(buttonA);

if (BUTTONstate1 == LOW){

tft.fillScreen(ST77XX_RED);

tft.setTextColor(ST77XX_WHITE, ST77XX_RED); // set text color to green and black background

tft.setTextSize(7); // text size

tft.setCursor(20, 61); // move cursor to position pixel

tft.print("N-GAS");

tft.setCursor(20, 140); // move cursor to position pixel

tft.print("ALARM");

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

asm volatile (" jmp 10");

}

else

{

BUTTONstate2 = digitalRead(buttonB);

if (BUTTONstate2 == LOW){

tft.fillScreen(ST77XX_RED);

tft.setTextColor(ST77XX_WHITE, ST77XX_RED); // set text color to green and black background

tft.setTextSize(7); // text size

tft.setCursor(20, 61); // move cursor to position pixel

tft.print(" GAS");

tft.setCursor(20, 140); // move cursor to position pixel

tft.print("ALARM");

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

asm volatile (" jmp 10");

}

else

{

BUTTONstate3 = digitalRead(buttonC);

if (BUTTONstate3 == LOW){

tft.fillScreen(ST77XX_RED);

tft.setTextColor(ST77XX_WHITE, ST77XX_RED); // set text color to green and black background

tft.setTextSize(7); // text size

tft.setCursor(20, 61); // move cursor to position pixel

tft.print("FIER");

tft.setCursor(20, 140); // move cursor to position pixel

tft.print("ALARM");

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

asm volatile (" jmp 10");

}

else

{

BUTTONstate4 = digitalRead(buttonD);

if (BUTTONstate4 == LOW){

tft.fillScreen(ST77XX_RED);

tft.setTextColor(ST77XX_WHITE, ST77XX_RED); // set text color to green and black background

tft.setTextSize(7); // text size

tft.setCursor(20, 61); // move cursor to position pixel

tft.print("SMOKE");

tft.setCursor(20, 140); // move cursor to position pixel

tft.print("ALARM");

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

delay(500);

tft.invertDisplay(true);

digitalWrite(LED,HIGH);

delay(500);

tft.invertDisplay(false);

digitalWrite(LED,LOW);

asm volatile (" jmp 10");

}

}

}

}

}