Touch Screen LCD display error.

azimsyamil · May 14, 2018, 1:09pm

Hey guys, currently I'm doing my project that use an Arduino Mega to connect with a touch screen LCD which is the ILI9481 type. I have completed my coding that use the Arduino to collect data from IR sensor and also temperature sensor. But after I uploaded the coding, the LCD screen become distorted. Can somebody help me with this problem? I don't know much about the touch screen LCD and am still learning.

Here I included the coding for my project. There is no error when I compile them.

#include <Adafruit_GFX.h>
#include <URTouch.h>
#include <UTFTGLUE.h>
URTouch myTouch(6,5,4,3,2);
UTFTGLUE myGLCD(0x9488,A2,A1,A3,A4,A0);

//LCD connection
#define LCD_CS A3
#define LCD_CD A2
#define LCD_WR A1
#define LCD_RD A0
#define LCD_RST A4

//Font used
#if !defined(SmallFont)
extern uint8_t SmallFont[];
#elif !defined(BigFont)
extern uint8_t BigFont[];
#endif

int x,y;
int rpm;
int tempC;
int tempF;
char currentPage,selectedUnit;
const int speedPin=22;
const int tempPin=A15;
const int battPin=A14;
unsigned long prevmillis;
unsigned long duration;
unsigned long lcdrefresh;
boolean currentstate;
boolean prevstate;

void setup() 
{
   //Setup the LCD
   myGLCD.InitLCD();
   myGLCD.clrScr();
   myGLCD.setFont(BigFont);
   myTouch.InitTouch();
   myTouch.setPrecision(PREC_MEDIUM);
   drawHomeScreen();
   currentPage='0';
   selectedUnit='0';

   //Setup Sensor
   pinMode(speedPin,INPUT);
   pinMode(tempPin,INPUT);
   pinMode(battPin,INPUT);
   prevmillis=0;
   prevstate=LOW;

}

//HomeScreen
void drawHomeScreen()
{
  myGLCD.setBackColor(0,0,0);
  myGLCD.setColor(255,255,255);
  myGLCD.setFont(BigFont);
  myGLCD.print("AUTOMOTIVE VISUAL", CENTER, 10);
  myGLCD.setColor(255,255,255);
  myGLCD.drawLine(0,32,480,32);
  myGLCD.setColor(255,255,255);
  myGLCD.setFont(BigFont);
  myGLCD.print("by AZIM SYAMIL", CENTER, 41);
  myGLCD.setFont(BigFont);
  myGLCD.print("Select Example", CENTER, 64);

//Button - Speed Sensor
  myGLCD.setColor(255,0,0);
  myGLCD.fillRoundRect(100,90,380,130);
  myGLCD.setColor(255,255,255);
  myGLCD.drawRoundRect(100,90,380,130);
  myGLCD.setFont(BigFont);
  myGLCD.setBackColor(255,0,0);
  myGLCD.print("SPEED SENSOR", CENTER, 110);

//Button - Temperature Sensor
  myGLCD.setColor(255,0,0);
  myGLCD.fillRoundRect(100,150,380,190);
  myGLCD.setColor(255,255,255);
  myGLCD.drawRoundRect(100,150,380,190);
  myGLCD.setFont(BigFont);
  myGLCD.setBackColor(255,0,0);
  myGLCD.print("TEMPERATURE SENSOR", CENTER, 170);

//Button - Battery Capacity
  myGLCD.setColor(255,0,0);
  myGLCD.fillRoundRect(100,210,380,250);
  myGLCD.setColor(255,255,255);
  myGLCD.drawRoundRect(100,210,380,250);
  myGLCD.setFont(BigFont);
  myGLCD.setBackColor(255,0,0);
  myGLCD.print("BATTERY CAPACITY", CENTER, 230);
}

//Draw Frame
void drawFrame(int x1,int y1,int x2,int y2)
{
  myGLCD.setColor(255,0,0);
  myGLCD.drawRoundRect(x1,y1,x2,y2);
  while (myTouch.dataAvailable())
    myTouch.read();
    myGLCD.setColor(255,255,255);
    myGLCD.drawRoundRect(x1,y1,x2,y2);
}

//Speed Sensor
void drawSpeedSensor()
{
  myGLCD.setColor(100,155,203);
  myGLCD.fillRoundRect(10,10,60,36);
  myGLCD.setColor(255,255,255);
  myGLCD.drawRoundRect(10,10,60,36);
  myGLCD.setFont(BigFont);
  myGLCD.setBackColor(100,155,203);
  myGLCD.print("<-",18,15);
  myGLCD.setBackColor(0,0,0);
  myGLCD.setFont(BigFont);
  myGLCD.print("Back to Main Menu",70,18);
  myGLCD.setFont(BigFont);
  myGLCD.print("SPEED SENSOR",CENTER,50);
  myGLCD.print("IR SENSOR",CENTER,76);
  myGLCD.setColor(255,0,0);
  myGLCD.drawLine(0,100,319,100);
  myGLCD.setFont(BigFont);
  myGLCD.print("Speed :",CENTER,120); 
}

//Temperature Sensor
void drawTemperatureSensor()
{
  myGLCD.setColor(100, 155, 203);
  myGLCD.fillRoundRect (10, 10, 60, 36);
  myGLCD.setColor(255, 255, 255);
  myGLCD.drawRoundRect (10, 10, 60, 36);
  myGLCD.setFont(BigFont);
  myGLCD.setBackColor(100, 155, 203);
  myGLCD.print("<-", 18, 15);
  myGLCD.setBackColor(0, 0, 0);
  myGLCD.setFont(BigFont);
  myGLCD.print("Back to Main Menu", 70, 18);
  myGLCD.setFont(BigFont);
  myGLCD.print("TEMPERATURE SENSOR",CENTER,50);
  myGLCD.print("LM 35",CENTER,76);
  myGLCD.setColor(255,0,0);
  myGLCD.drawLine(0,75,319,75);
}

//Battery Capacity
void drawBatteryCapacity()
{
  myGLCD.setColor(100, 155, 203);
  myGLCD.fillRoundRect (10, 10, 60, 36);
  myGLCD.setColor(255, 255, 255);
  myGLCD.drawRoundRect (10, 10, 60, 36);
  myGLCD.setFont(BigFont);
  myGLCD.setBackColor(100, 155, 203);
  myGLCD.print("<-", 18, 15);
  myGLCD.setBackColor(0, 0, 0);
  myGLCD.setFont(BigFont);
  myGLCD.print("Back to Main Menu", 70, 18);
  myGLCD.setFont(BigFont);
  myGLCD.print("BATTERY CAPACITY",CENTER,50);
  myGLCD.print("48 VOLTS",CENTER,76);
  myGLCD.setColor(255,0,0);
  myGLCD.drawLine(0,75,319,75); 
}

//Input Speed Sensor
void getSpeed()
{
  //RPM Measurement
  currentstate=digitalRead(speedPin);
  if(prevstate !=currentstate)
  {
    if(currentstate==HIGH)
    {
      duration=(micros()-prevmillis);
      rpm=(60000000/duration);
      prevmillis=micros();
    }
  }
  prevstate=currentstate;
  if((millis()-lcdrefresh)>=100)
    {
      myGLCD.setFont(BigFont);
      myGLCD.setColor(255,255,255);
      myGLCD.setBackColor(0,0,0);
      myGLCD.printNumI(rpm,130,145,3,'0');
      myGLCD.setFont(BigFont);
      myGLCD.print("rpm ",235,178);
      lcdrefresh=millis();
    }
    delay(10);
}

//Input Temperature Sensor
void getTemperature()
{
  int value=analogRead(tempPin);
  float millivolts=(value/1024.0)*5000;
  float celcius=millivolts/10;
  myGLCD.setColor(255,255,255);
  myGLCD.setBackColor(0,0,0);
  myGLCD.setFont(BigFont);
  myGLCD.printNumI(celcius,130,175,3,'0');
  myGLCD.print("CELCIUS",CENTER, 200);
  delay(1000);
}

//Input Battery Capacity
void getBattery()
{
  int voltReading=analogRead(battPin);
  int volts=(voltReading/1023)*100;
  myGLCD.setBackColor(0,0,0);
  myGLCD.setColor(255,255,255);
  myGLCD.setFont(BigFont);
  myGLCD.printNumI(volts,CENTER,145,3,'0');
  myGLCD.print(" %",200,145);
  delay(1000);
}

void loop()
{
  if (currentPage=='0')
  {
    if(myTouch.dataAvailable())
    {
      myTouch.read();
      x=myTouch.getX();
      y=myTouch.getY();
      //Touch Speed
      if((x>=100)&&(x<=380)&&(y>=90)&&(y<=130))
      {
        drawFrame(100,90,380,130);
        currentPage='1';
        myGLCD.clrScr();
        drawSpeedSensor();
      }
      //Touch Temperature
      if((x>=100)&&(x<=380)&&(y>=150)&&(y<=190))
      {
        drawFrame(100,150,380,190);
        currentPage='2';
        myGLCD.clrScr();
        drawTemperatureSensor();
      }
      //Touch Battery
      if((x>=100)&&(x<=380)&&(y>=210)&&(y<=250))
      {
        drawFrame(100,210,380,250);
        currentPage='3';
        myGLCD.clrScr();
        drawBatteryCapacity;
      }
    }
  }
  if (currentPage=='1')
  {
    //ayat psal speed sensor
    getSpeed();
    if(myTouch.dataAvailable())
    {
      myTouch.read();
      x=myTouch.getX();
      y+myTouch.getY();
    //Back Button
    if ((x>=10)&&(x<=60)&&(y>=10)&&(y<=36))
      {
        drawFrame(10,10,60,36);
        currentPage='0';
        myGLCD.clrScr();
        drawHomeScreen();
      }
    }
  }
  if (currentPage='2')
  {
    //ayat temperature sensor
    getTemperature();
    if(myTouch.dataAvailable())
    {
      myTouch.read();
      x=myTouch.getX();
      y=myTouch.getY();
    //Back Button
    if((x>=10)&&(x<=60)&&(y>=10)&&(y<=36))
      {
        drawFrame(10,10,60,36);
        myGLCD.clrScr();
        drawHomeScreen();
      }
    }
  }
  if(currentPage='3')
  {
    //ayat Battery Capacity
    getBattery();
    if(myTouch.dataAvailable())
    {
      myTouch.read();
      x=myTouch.getX();
      y-myTouch.getY();
    //Back Button
    if((x<=10)&&(x>=60)&&(y>=10)&&(y<=36))
      {
        drawFrame(10,10,60,36);
        myGLCD.clrScr();
        drawHomeScreen();
      }
    }
  }
}

Thank you in advanced.

ieee488 · May 14, 2018, 1:50pm

Before throwing the whole big mess together, you should learn how to program the touchscreen LCD first.

.

azimsyamil · May 14, 2018, 1:54pm

ieee488:
Before throwing the whole big mess together, you should learn how to program the touchscreen LCD first.

.

So can u see any mistakes that I've done there? Im confused haha

ieee488 · May 14, 2018, 2:00pm

azimsyamil:
So can u see any mistakes that I've done there? Im confused haha

I am not going to bother.

As I wrote before, learn how to write to the touchscreen LCD instead of throwing your big mess onto the Arduino!

.

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