Subclass that you can use jointly with https://github.com/yoprogramo/QRcodeDisplay to generate QRcodes in TFT displays like ST7735

To use it:

Add as dependencies:

• yoprogramo/QRcodeDisplay
• yoprogramo/QRcode_ST7735
• adafruit/Adafruit GFX Library
• adafruit/Adafruit ST7735 and ST7789 Library

Open Library Manager (menu Sketch > Include Library > Manage Libraries…) then install the following libraries:

• QRcodeDisplay
• QRcode_ST7735
• Adafruit GFX Library
• adafruit/Adafruit ST7735 and ST7789 Library

Creating a QRcode is just as simple as:

#define TFT_RST   25    
#define TFT_CS    5     
#define TFT_DC    26    

#include <Adafruit_GFX.h>      
#include <Adafruit_ST7735.h>   
#include <SPI.h>
#include <qrcode_st7735.h>

#define TFTMODEL INITR_144GREENTAB

Adafruit_ST7735 display = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
QRcode_ST7735 qrcode (&display);


void setup() {

   display.initR(TFTMODEL);
   qrcode.init();
   qrcode.create("Hello world.");

}

For other displays, please refer the main repository: https://github.com/yoprogramo/QRcodeDisplay