Text on Lcd who won't stop blinking

Other Hardware Displays
1

Hello I'm using a LCD and i got problem with the LCD i don't know why but the texte won't stop blinking and the letter is one time here one time not here I dont know what to do

here my code

#include <SD.h>
//============= BNO055=======================//
#include "BNO055_support.h"    //Contains the bridge code between the API and Arduino
#include <Wire.h>
//==================LCD=====================================//
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h> 
//======Déclaration des I/O=================================================
#define TFT_CS   7 // LCD
#define TFT_DC   6 // LCD
#define TFT_RST  5// LCD
#define TFT_BACKLIGHT  2 // LCD fond d'écran
#define BLACK 0x000 
//===========Déclarations des Instances================//
//This structure contains the details of the BNO055 device that is connected. (Updated after initialization)
struct bno055_t myBNO;
struct bno055_euler myEulerData; //Structure to hold the Euler data
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
//===========================================================
const int chipSelect = SS1; // Pin utilisé pour le MKRzero (28)
unsigned long lastTime = 0;
int loadDataCheck;  //Checks if data needs to be loaded 
//======Choix des couleurs du LCD =========================================== 
char fond1 = 0;     
char fond2 = 0;     
char fond3 = 0;     

char text1 = 0;   
char text2 = 255;   
char text3 = 0;
// the setup function runs once when you press reset
// or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT); //Pin de l'arduino MKRzero utilisée
  pinMode(TFT_BACKLIGHT,OUTPUT);
  tft.println("DataLogger Exemple:"); 
  
   // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {  // si la carte SD n'est pas détéctée
    tft.println("Carte SD non présente,ou probleme");  // Carte SD non présente
    // don't do anything more:
    return;
    
  }  
  tft.println("Carte Initialisée.");

  
  //within one second to pass unstable status
  delay(1000);
  //======================Initialisation du LCD==============================================
  tft.initR(INITR_BLACKTAB);      
  digitalWrite(TFT_BACKLIGHT,HIGH);    
  tft.setRotation(0);  
  
  uint16_t time = millis();
  tft.fillScreen(ST7735_BLACK);
  time = millis() - time;
  
  Serial.println(time, DEC);
  delay(500);
  //============Initalisation du capteur BNO055============================
  Wire.begin();
  BNO_Init(&myBNO); //Assigning the structure to hold information about the device
  
  //Configuration  pour  NDoF mode
  bno055_set_operation_mode(OPERATION_MODE_NDOF);
//=====================================================================================
  delay(500);
  Serial.begin(9600);
  tft.println("Système pret ._.");  
}

// the loop function runs over and over again forever
void loop() {
 //=====Effacement de l'écran===============================================
  tft.setTextWrap(true);
  tft.fillScreen(ST77XX_BLACK);
  delay(500);
  //======================================== Ecriture des titres================================
  tft.setCursor(25, 2);
  tft.setTextColor(ST77XX_YELLOW);
  tft.setTextSize(2);
  tft.println("POSITION EULER");
 //=========================Affichhage des valeurs du capteur sur LCD=======
 /*
  unsigned long currentTime=millis();
  if ((millis() - lastTime) >= 100) //To stream at 10 Hz without using additional timers
  {
    lastTime = millis();

    bno055_read_euler_hrp(&myEulerData);      //Update Euler data into the structure

    //Serial.print(" Temps  : ");       //To read out the Time Stamp
   // Serial.println(lastTime);
  tft.setCursor(0, 50);
  tft.setTextColor(ST77XX_WHITE);
  tft.setTextSize(2);
  tft.print(" Axe z(yaw): ");
  tft.setCursor(25, 50);
  tft.setTextColor(ST77XX_WHITE);
  tft.setTextSize(2);
  tft.println(float(myEulerData.h) / 16.00);// declarer une fonction qui prend en compte les variables x,y et z 
    //Serial.print(" Axe z(yaw): ");       //To read out the Heading (Yaw)
    //Serial.println(float(myEulerData.h) / 16.00);   //Convert to degrees

   // Serial.print(" Axe X(Roll): ");         //To read out the Roll
   // Serial.println(float(myEulerData.r) / 16.00);   //Convert to degrees

   // Serial.print(" Axe Y (Pitch): ");        //To read out the Pitch
   // Serial.println(float(myEulerData.p ) / 16.00);   //Convert to degrees
    //Serial.println();         //Extra line to differentiate between packets
  }                 
  if (loadDataCheck) logData();  
}

void dataCheck(){
  loadDataCheck=1;
}

void logData(void) {     
  
  String dataString = "";

  File dataFile = SD.open("Position.txt", FILE_WRITE);  // ouvrir le document sur la carte SD

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the Serial port too:
    tft.println(dataString);
  }
  // if the file isn't open, pop up an error:
  else {
    tft.println("error opening datalog.txt");
  }
  loadDataCheck=0;
  */
}
2

You clear the screen, stay so half of second, than print the text and clear it again after a moment. What are you expecting from it? Of course the text will blinks with your code...

3

i change this part already but it still blinking and the letter disapear and come back

4

Why do you show the code that have been changed already? Insert the actual code.

5

I change this now that's why.

 tft.setTextWrap(true);
  tft.fillScreen(ST77XX_BLACK); // Effacement de l'écran
  delay(1);

The only thing I change is that

6

I already this this code and it was working now I'm using this with another arduino and it's not working anymore

7

it doesn't change much.

Why do you clear the screen in each call the loop? And why do you print your text again and again, if it doesn't change?
Update the screen ONLY if you changed the text on it.

8

I'm using a captor so the text is going to change every time i move the captor this is why I'm clearing the screen

9

plus the position is going to disappear after so it need to be clearing
when i put the value with the captor it do the same thing the value are not on the screen and keep disappear

10

no, you clearing the screen disregard whether the captor moved or not.
Clear the screen only after captor is moved.

11

but the word position need to disppear too in my project

12

Why it "need" that?- I don't understand

13

Because when the position disppear it's goign to put this text SD okay then the Position is going to come back but I try what you said to put the clearing after the position, but i havent change anything the texte Position continue to lag

14

please show the revised code

15 
#include <SD.h>
//============= BNO055=======================//
#include "BNO055_support.h"    //Contains the bridge code between the API and Arduino
#include <Wire.h>
//==================LCD=====================================//
#include <Adafruit_GFX.h>
#include <Adafruit_ST7735.h> 
//======Déclaration des I/O=================================================
#define TFT_CS   7 // LCD
#define TFT_DC   6 // LCD
#define TFT_RST  5// LCD
#define TFT_BACKLIGHT  2 // LCD fond d'écran
#define BLACK 0x000 
//===========Déclarations des Instances================//
//This structure contains the details of the BNO055 device that is connected. (Updated after initialization)
struct bno055_t myBNO;
struct bno055_euler myEulerData; //Structure to hold the Euler data
Adafruit_ST7735 tft = Adafruit_ST7735(TFT_CS, TFT_DC, TFT_RST);
//===========================================================
const int chipSelect = SS1; // Pin utilisé pour le MKRzero (28)
unsigned long lastTime = 0;
int loadDataCheck;  //Checks if data needs to be loaded 
//======Choix des couleurs du LCD =========================================== 
char fond1 = 0;     
char fond2 = 0;     
char fond3 = 0;     

char text1 = 0;   
char text2 = 255;   
char text3 = 0;
// the setup function runs once when you press reset
// or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT); //Pin de l'arduino MKRzero utilisée
  pinMode(TFT_BACKLIGHT,OUTPUT);
  Serial.println("DataLogger Exemple:"); 
  
   // see if the card is present and can be initialized:
  if (!SD.begin(chipSelect)) {  // si la carte SD n'est pas détéctée
    Serial.println("Carte SD non présente,ou probleme");  // Carte SD non présente
    // don't do anything more:
    return;
    
  }  
  //tft.println("Carte Initialisée.");

  
  //within one second to pass unstable status
  delay(1000);
  //======================Initialisation du LCD==============================================
  tft.initR(INITR_BLACKTAB);      
  digitalWrite(TFT_BACKLIGHT,HIGH);    
  tft.setRotation(0);  
  
  uint16_t time = millis();
  tft.fillScreen(ST7735_BLACK);
  time = millis() - time;
  
  Serial.println(time, DEC);
  delay(500);
  //============Initalisation du capteur BNO055============================
  Wire.begin();
  BNO_Init(&myBNO); //Assigning the structure to hold information about the device
  
  //Configuration  pour  NDoF mode
  bno055_set_operation_mode(OPERATION_MODE_NDOF);
//=====================================================================================
  delay(500);
  Serial.begin(9600);
  //tft.println("Système pret ._.");  
}

// the loop function runs over and over again forever
void loop() {

  //======================================== Ecriture des titres================================

  tft.setCursor(25, 2);
  tft.setTextColor(ST77XX_YELLOW);
  tft.setTextSize(2);
  tft.println("POSITION");
 //=========================Affichhage des valeurs du capteur sur LCD=======
 
  unsigned long currentTime=millis();
  if ((millis() - lastTime) >= 100) //To stream at 10 Hz without using additional timers
  {
    lastTime = millis();

    bno055_read_euler_hrp(&myEulerData);      //Update Euler data into the structure
 //=====Effacement de l'écran===============================================
  tft.setTextWrap(true);
  tft.fillScreen(ST77XX_BLACK); // Effacement de l'écran
  delay(1);
    //Serial.print(" Temps  : ");       //To read out the Time Stamp
   // Serial.println(lastTime);
  tft.setCursor(0, 50);
  tft.setTextColor(ST77XX_WHITE);
  tft.setTextSize(2);
  tft.print("z:");
  tft.setCursor(45, 50);
  tft.setTextColor(ST77XX_WHITE);
  tft.setTextSize(2);
  tft.println(float(myEulerData.h) / 16.00);// declarer une fonction qui prend en compte les variables x,y et z 
    //Serial.print(" Axe z(yaw): ");       //To read out the Heading (Yaw)
    //Serial.println(float(myEulerData.h) / 16.00);   //Convert to degrees

   // Serial.print(" Axe X(Roll): ");         //To read out the Roll
   // Serial.println(float(myEulerData.r) / 16.00);   //Convert to degrees

   // Serial.print(" Axe Y (Pitch): ");        //To read out the Pitch
   // Serial.println(float(myEulerData.p ) / 16.00);   //Convert to degrees
    //Serial.println();         //Extra line to differentiate between packets
  }                 
  if (loadDataCheck) logData();  
}

void dataCheck(){
  loadDataCheck=1;
}

void logData(void) {     
  
  String dataString = "";

  File dataFile = SD.open("Position.txt", FILE_WRITE);  // ouvrir le document sur la carte SD

  // if the file is available, write to it:
  if (dataFile) {
    dataFile.println(dataString);
    dataFile.close();
    // print to the Serial port too:
    tft.println(dataString);
  }
  // if the file isn't open, pop up an error:
  else {
    tft.println("error opening datalog.txt");
  }
  loadDataCheck=0;
  
}
16

Sorry, don't you understand the code what you editing?
What are you expecting, when print "POSITION" and almost immediately delete it, clearing the screen?

The line

 tft.fillScreen(ST77XX_BLACK);

should be BEFORE any printing , otherwise the text will be deleted.

17

It like my third time using arduino so yes sorry if it's hard for me

18

try this (replace your loop() function with code below)

19

I will try thank you

20

Hello I try it's much better than before it still blinking but the letter don't disappear anymore thank you very much