Tft on uno wifi rev2 board

Hardware Arduino WiFi Rev2
1

Hello,
I try to connect a TFT display on my Wifi REV2 board.
I have following this guide : Guide to 1.8 TFT Display with Arduino | Random Nerd Tutorials
But nothing works, just a white screen.
Someone success to connect tft on wifi uno rev2 board ?
Thanks for your help.
David

2

Post the code you used, using code tags, even if it's the same as the tutorial.
Also, post a schematic, even if it's hand drawn.

3

pinout is the following:
image

and the code is :

/*
 * Rui Santos 
 * Complete Project Details https://randomnerdtutorials.com
 */

// include TFT and SPI libraries
#include <TFT.h>  
#include <SPI.h>

// pin definition for Arduino UNO
#define cs   10
#define dc   9
#define rst  8


// create an instance of the library
TFT TFTscreen = TFT(cs, dc, rst);

void setup() {

  //initialize the library
  TFTscreen.begin();

  // clear the screen with a black background
  TFTscreen.background(0, 0, 0);
  //set the text size
  TFTscreen.setTextSize(2);
}

void loop() {

  //generate a random color
  int redRandom = random(0, 255);
  int greenRandom = random (0, 255);
  int blueRandom = random (0, 255);
  
  // set a random font color
  TFTscreen.stroke(redRandom, greenRandom, blueRandom);
  
  // print Hello, World! in the middle of the screen
  TFTscreen.text("Hello, World!", 6, 57);
  
  // wait 200 miliseconds until change to next color
  delay(200);
}
4

Not behind a PC at the moment to check. Please compare the pinouts of your board with that of an Uno; I suspect that the SPI interface is not on pins 11 .. 13.

5

I have checked pinouts and I only see SDA, not SCK ...

6
  • MOSI − 11 or ICSP-4
  • MISO − 12 or ICSP-1
  • SCK − 13 or ICSP-3
  • SS − 10
7

It looks like you are confusing the I2C interface (SDA, SCK) with the SPI interface (MOSI, etc.).

Post a link to the TFT, and state which interface you plan to wire up and use.

8

I use this TFT :

I prefer to ICSP connector.

I would like use this TFT to display wifi connection status and some other information.

It works great with Uno R3 :

image
image1920×2560 322 KB

9

It is only shown on the "Full Pinout" version of the pinout diagram, which can be downloaded from the "Resources" section of the Arduino Uno WiFi Rev2 documentation page:

https://docs.arduino.cc/hardware/uno-wifi-rev2#resources

image
image717×193 24.5 KB

Unlike the Uno, the SPI bus of the Uno WiFi Rev2 is only available on the ICSP header, as mentioned in the "Getting Started" page:

https://www.arduino.cc/en/Guide/ArduinoUnoWiFiRev2#spi

The SPI interface is available on the ICSP connector>

Although it is unfortunate that this difference has not been communicated to the users more clearly, there is an important benefit to this difference. The benefit is that pins 11-13 are still available for use as normal digital pins even when you have something connected to the SPI bus on the Uno WiFi Rev2. With the Uno, those 3 pins can only be used for the SPI devices when the bus is in use.

10

I suppose I must change Pin Definition ? In the TFT example I see :
For UNO
#define cs 10
#define dc 9
#define rst 8
// pin definition for the Leonardo
// #define cs 7
// #define dc 0
// #define rst 1

11

You should set those to whichever pins you are using for those connections to the TFT. If you are using pins 10, 8, and 9 then there is no need to change them.

12

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