Need help OLED graph display for real-time distance sensor

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1

Hi. I am using an OLED 3.5-inch TFT Display Shield with Arduino Mega to graph data from a VL53l0X Distance Sensor. I want to keep the display continuous so I use the scroll function.

I am facing a problem. The graph is smooth and responsible in some first seconds, but after like 10 seconds it showed wrong data even I stopped moving the object.
U can see the picture here:

image
image1074×592 48.8 KB

My code is below:

#include <LCDWIKI_GUI.h> //Core graphics library
#include <LCDWIKI_KBV.h> //Hardware-specific library
LCDWIKI_KBV mylcd(ILI9486, 40, 38, 39, -1, 41); //model,cs,cd,wr,rd,reset
#include "Adafruit_VL53L0X.h"
#include <Wire.h>
#include <SPI.h>
Adafruit_VL53L0X lox = Adafruit_VL53L0X();

#define BLACK   0x0000
#define BLUE    0x001F
#define RED     0xF800
#define GREEN   0x07E0
#define CYAN    0x07FF
#define MAGENTA 0xF81F
#define YELLOW  0xFFE0
#define WHITE   0xFFFF
int i;

void setup()
{ 
  Serial.begin(9600);
   Wire.begin();
   if (!lox.begin()) {
    Serial.println(F("Failed to boot VL53L0X"));
    while(1);
  }
  mylcd.Init_LCD();
  mylcd.Set_Draw_color(RED);
  mylcd.Fill_Screen(WHITE);
  mylcd.Set_Text_Size(1);
  mylcd.Set_Text_colour(RED);
  mylcd.Set_Text_Back_colour(WHITE);
  mylcd.Draw_Fast_VLine(40,40,440);
  mylcd.Draw_Fast_VLine(39,40,440);
  mylcd.Draw_Fast_HLine(40,39,200);
  mylcd.Draw_Fast_HLine(40,40,200);
  mylcd.Draw_Fast_VLine(89,35,5);
  mylcd.Draw_Fast_VLine(139,35,5);
  mylcd.Draw_Fast_VLine(189,35,5);
  mylcd.Draw_Fast_VLine(239,35,5);
  mylcd.Draw_Fast_HLine(35,42,5);
  mylcd.Draw_Fast_HLine(35,151,5);
  mylcd.Draw_Fast_HLine(35,260,5);
  mylcd.Draw_Fast_HLine(35,370,5);
  mylcd.Draw_Fast_HLine(35,479,5);

  mylcd.Set_Rotation(1);
  mylcd.Print_String("0",30,277);
  mylcd.Print_String("50",24,227);
  mylcd.Print_String("100",18,177);
  mylcd.Print_String("150",18,127);
  mylcd.Print_String("200",18,77);
  mylcd.Print_String("s(mm)",14,67);
  mylcd.Set_Rotation(0);
  mylcd.Set_Draw_color(BLUE);

}
void loop()
{ 
  for ( i = 0; i <= 436; i+=4) {
   VL53L0X_RangingMeasurementData_t measure;
   lox.rangingTest(&measure, false);
   mylcd.Vert_Scroll(42, 436, i);
   mylcd.Draw_Fast_HLine(42,i+40,measure.RangeMilliMeter);
   delay(100);
  } 
}

I am new to arduino so if anyone could help me with this I am very much appreciated it.

2

Declare "measure" once in setup, not over and over again in loop.