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); }