Description: A QR Code .bmp file is uploaded to a Micro-SD Card and displayed on a 1.54″ TFT LCD with a Wemos Lolin D1 Mini Pro V2.
Notes: In order for an image to be displayed on the LCD it must be converted to .bmp format and then uploaded to the folder named “picture” on the Micro-SD card. An image can be converted online to bmp with: Online-Convert.
Supplies:
1 – Breadboard 400 Points
1 – Wemos Lolin D1 Mini Pro V2
1 – 1.54” 240×240 TFT LCD Display with MicroSD Card Breakout (DF Robot) >> Link <<
Arduino Code:
#include “DFRobot_GDL.h”
#include <SD.h>
#include <SPI.h>
#include “DFRobot_Picdecoder_SD.h”
DFRobot_Picdecoder_SD decoder;
#define TFT_DC 0
#define TFT_CS 15
#define TFT_RST 2
#define TFT_SD 4
DFRobot_ST7789_240x240_HW_SPI screen(/*dc=*/TFT_DC,/*cs=*/TFT_CS,/*rst=*/TFT_RST);
void setup() {
//Initialize the serial port
Serial.begin(115200);
//Initialize screen
screen.begin();
//Initialize the SD card, wait until the initialization is successful
while(1)
{
}
#if defined ESP8266
if (SD.begin(/*sdcs=*/TFT_SD)){
#else
if (SD.begin(/*sdcs=*/TFT_SD)){
#endif
Serial.println(“initialization done.”);
break;
}
Serial.println(“initialization failed!”);
}
}
void loop() {
/* Set the screen color to white */
screen.fillScreen(COLOR_RGB565_WHITE);
decoder.drawPicture(/*filename=*/”picture/QR.bmp”,/*sx=*/0,/*sy=*/0,/*ex=*/screen.width(),/*ey=*/screen.height(),/*screenDrawPixel=*/screenDrawPixel);
delay(30000);
}
//For decoding function calling, the function of this function is to draw a pixel on the screen
void screenDrawPixel(int16_t x, int16_t y, uint16_t color) {
//Draw a point on the screen
screen.writePixel(x,y,color);
}