confusion with pins for ILI9341 v3 UNO shield multi wire


Im confused on what these pin names means?

#define sd_cs ???
#define lcd_cs ???
#define dc ???
#define rst A4 //8

Any help is appreciated. The photo attached is of the underside of the Shield.


  Arduino TFT Bitmap Logo example

  This example reads an image file from a micro-SD card
  and draws it on the screen, at random locations.

  In this sketch, the Arduino logo is read from a micro-SD card.
  There is a .bmp file included with this sketch.
  - open the sketch folder (Ctrl-K or Cmd-K)
  - copy the "arduino.bmp" file to a micro-SD
  - put the SD into the SD slot of the Arduino TFT module.

  This example code is in the public domain.

  Created 19 April 2013 by Enrico Gueli


// include the necessary libraries
#include <SPI.h>
#include <SD.h>
#include <TFT.h>  // Arduino LCD library

// pin definition for the Uno
#define sd_cs    ???
#define lcd_cs   ???
#define dc         ???
#define rst    A4   //8
  //SPI Communication
  #define LCD_CS A3 //
  #define LCD_CD A2
  #define LCD_WR A1
  #define LCD_RD A0
  // optional
  #define LCD_RESET A4//

TFT TFTscreen = TFT(lcd_cs, dc, rst);

// this variable represents the image to be drawn on screen
PImage logo;

void setup() {
  // initialize the GLCD and show a message
  // asking the user to open the serial line
  TFTscreen.background(255, 255, 255);

  TFTscreen.stroke(0, 0, 255);
  TFTscreen.println(F("Arduino TFT Bitmap Example"));
  TFTscreen.stroke(0, 0, 0);
  TFTscreen.println(F("Open serial monitor"));
  TFTscreen.println(F("to run the sketch"));

  // initialize the serial port: it will be used to
  // print some diagnostic info
  //while (!Serial) {
  // wait for serial port to connect. Needed for native USB port only

  // clear the GLCD screen before starting
  TFTscreen.background(255, 255, 255);

  // try to access the SD card. If that fails (e.g.
  // no card present), the setup process will stop.
  Serial.print(F("Initializing SD card..."));
  if (!SD.begin(sd_cs)) {

  // initialize and clear the GLCD screen
  TFTscreen.background(255, 255, 255);

  // now that the SD card can be access, try to load the
  // image file.
  logo = TFTscreen.loadImage("main.bmp");
  if (!logo.isValid()) {
    Serial.println(F("error while loading arduino.bmp"));

void loop() {
  // don't do anything if the image wasn't loaded correctly.
  if (logo.isValid() == false) {

  Serial.println(F("drawing image"));

  // get a random location where to draw the image.
  // To avoid the image to be draw outside the screen,
  // take into account the image size.
  int x = random(TFTscreen.width() - logo.width());
  int y = random(TFTscreen.height() - logo.height());

  // draw the image to the screen
  TFTscreen.image(logo, x, y);

  // wait a little bit before drawing again

Thanks in advance.

sd_cs is the SD card chip select
lcd_cs is the chip select for the LCD
dc is for the LCD, it tells the LCD controller if the incoming byte is data (to display) of a command, like clear()
rst is the pin to reset the LCD controller


The possible sd card connections are as follow:

D13 SD_sck ( clock)
D12 SD_D0 (not sure)
D11 SD_D1 (not sure)
D10 SD_SS (not sure)

The labeling on the TFT is also not clear. Im not sure about the numbers on the pins to declare.


I should have mentioned that its used with the DUE.