#include <Arduino.h>
#include <Adafruit_ILI9341.h>
#include <Button2.h>
 
#define TFT_CS    15
#define TFT_DC    33
#define TFT_RST   -1
#define BUTTON_PIN  14
 
Adafruit_ILI9341 tft = Adafruit_ILI9341(TFT_CS, TFT_DC, TFT_RST);
Button2 myBtn = Button2(BUTTON_PIN);
 
bool displayOn = true;
 
void buttonPressed(Button2& btn) {
    if (displayOn) {
        tft.fillScreen(ILI9341_BLACK);
        displayOn = false;
    } else {
        tft.fillScreen(ILI9341_RED);
        displayOn = true;
    }
}
 
void setup() {
    tft.begin();
    tft.setRotation(3);
 
    myBtn.setClickHandler(buttonPressed);
}
 
void loop() {
    myBtn.loop();
}