ESP32 + TFT not working - Screen Blank - Help!

[whateverfast]

Hi,

I am trying to do this project: https://electropeak.com/learn/interfaci ... ith-esp32/

I have an ESP32S and a TFT SP1 2.8. I installed the TFT_eSPI libraries (using arduino ide) and edit the USER_SETUP file with the appropriate PINS and versions (I believe). However, I tried different configurations but I was unable to turn on the TFT. I know that the TFT is working because I have used it with another board.

In the USER_SETUP tried with different drivers: ILI9341_DRIVER and ILI9341_2_DRIVER and the result is the same. Also different PINS.

I also run with the differenr boards types: DO IT ESP32 DEVKIT V1, and other ones that also compile.

Can you please help Thank you

The pins are the following in the USER_SETUP file
#define TFT_MISO 19
#define TFT_MOSI 23
#define TFT_SCLK 18
#define TFT_CS 15 // Chip select control pin
#define TFT_DC 4 // Data Command control pin
#define TFT_RST 2 // Reset pin (could connect to RST pin)

The arduino code is the following:

Code: Select all

#include <TFT_eSPI.h> // Hardware-specific library
#include <SPI.h>

TFT_eSPI tft = TFT_eSPI();       // Invoke custom library

void setup(void) {
  tft.init();
  tft.setRotation(0);
  Serial.begin(57600); // For debug
  tft.fillScreen(TFT_WHITE);
  Serial.println("Setup Done");
  Serial.println(TFT_MISO);
  Serial.println(TFT_MOSI);
  Serial.println(TFT_SCLK);
  Serial.println(TFT_CS);
  Serial.println(TFT_DC);
  Serial.println(TFT_RST);  
  Serial.println(TFT_WIDTH);
  Serial.println(TFT_HEIGHT);
  #ifdef ILI9341_DRIVER
  Serial.println("ILI9341_DRIVER");
  #endif
  #ifdef ILI9341_2_DRIVER
  Serial.println("ILI9341_2_DRIVER");
  #endif
}


void loop() {
   tft.fillScreen(TFT_GREEN);
   delay(250);
   tft.fillScreen(TFT_BLACK);
   delay(250);
   tft.fillScreen(TFT_WHITE);
   delay(250);
   tft.fillScreen(TFT_RED);
   delay(250);
}

[vritzka]

Does at least the background light turn on?

[whateverfast]

The background light flickers when I press the reset button. I have also tried with a different library and still no success. I double-checked the pins but had no success. Any ideas?

Code: Select all

#include <Arduino_GFX_Library.h>

#define TFT_SCK    18
#define TFT_MOSI   23
#define TFT_MISO   19
#define TFT_CS     15
#define TFT_DC     21
#define TFT_RESET  17

void setup(void)
{
  Serial.begin(115200);
  Serial.print("MOSI: ");
  Serial.println(MOSI);
  Serial.print("MISO: ");
  Serial.println(MISO);
  Serial.print("SCK: ");
  Serial.println(SCK);
  Serial.print("SS: ");
  Serial.println(SS); 
  
  Arduino_ESP32SPI bus = Arduino_ESP32SPI(TFT_DC, TFT_CS, TFT_SCK, TFT_MOSI, TFT_MISO);
  Arduino_ILI9341 display = Arduino_ILI9341(&bus, TFT_RESET);
 
  display.begin();
  display.fillScreen(WHITE);
  display.setCursor(20, 20);
  display.setTextSize(2);
  display.setTextColor(BLUE);
  display.print("Hello world");
}
 
void loop() {
  }

[vritzka]

The screen backlight should glow up as soon as you connect 3.3 V and ground.

Since its an LED, you need to connect it through a resistor (100 OHM would work).

It seems there is no resistor now. So maybe the high current draw makes the ESP32 turn off and thats why it doesn't work.