# TFT screen


## Prequesites

To use the TFT screen, you need to install the following libraries:

``` SPI.h , Adafruit_GFX.h, Adafruit_ST7796S_kbv.h ```


## Programming the screen
To program the screen we need to first declare all the pins and give it to the Adafruit_ST7796S_kbv.h library. Then we need to initialize the screen and we can start using it.

```cpp
#define TFT_CS 14
#define TFT_DC 13
#define TFT_RST 12 
#define MOSI 11
#define SCK 10
#define MISO 9

//simplify the name of the library and feed all the correct pins to it

Adafruit_ST7796S_kbv tft = Adafruit_ST7796S_kbv(TFT_CS, TFT_DC, MOSI, SCK, TFT_RST, MISO);
```

## Drawing on the screen

To draw on the screen we can use the following functions:

```cpp
tft.fillScreen(0x0000); //clear the screen
tft.fillRect(0, 0, 240, 240, 0xFFFF); //draw a white rectangle
tft.fillCircle(120, 120, 50, 0xF800); //draw a red circle
tft.fillTriangle(0, 0, 240, 240, 0, 240, 0x1F); //draw a blue triangle
tft.fillRoundRect(0, 0, 240, 240, 10, 0xF81F); //draw a pink rounded rectangle
tft.drawChar(120, 120, 'A', 0xFFFF, 0x0000, 2); //draw a character
tft.setTextSize(2); //set the text size
tft.setTextColor(0xFFFF); //set the text color
tft.setCursor(0, 0); //set the cursor
tft.println("Hello World!"); //print a string
```

To write Hello world on the screen we can use the following code:

```cpp
tft.fillScreen(0x0000); //clear the screen
tft.setTextSize(2); //set the text size
tft.setTextColor(0xFFFF); //set the text color
tft.setCursor(0, 0); //set the cursor so it starts at the top right, you can also make this other numbers to change the position
tft.println("Hello World!"); //print a string
```

To clear the screen for new text you can use the following code:

```cpp
tft.fillScreen(0x0000); //clear the screen
```