LCD menu and lcd.clear();

Using Arduino Programming Questions
1

Hi
Without lcd.clear(); on the LCD I have a mess, when I put it in case # 1, the scrolling doesn't work, without it menu is working but on LCD I have flickering.
What is wrong?

byte lcdNumCols = 16;
#include <LcdBarGraph.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(PC15, PC14, PB5, PB6, PB8, PB9);
//LcdBarGraph lbg(&lcd, lcdNumCols);  // -- creating
LcdBarGraph lbgURx(&lcd, 4, 0, 0); // -- First line at column 0
LcdBarGraph lbgUbal(&lcd, 4, 0, 1); // -- Second line at column 0
//------------------------

int botonState = 0, i;
byte lastButtonState = LOW;
byte ledState = LOW;

int t;
int z;

void setup()
{
  Serial.begin(115200);
  lcd.begin(16, 2);
  lcd.begin(2, lcdNumCols);

}

//=========================================== end setup  ===========================
void loop()

{



  //                      ++++++++++++++++++++++++++++++++  menu ++++++++++++++++++++++++++++++++
  if (digitalRead(PA15) == 0)
  {
    // botonState = (botonState + 1) % 3;
    botonState = (botonState + 1) % 8;
    delay (200);
  }



  lcd.setCursor(0, 0);
  switch (botonState)
  {
    case 0:
      lcd.clear();
      lcd.print("#0 z ");
      lcd.setCursor(6, 0);
      lcd.print("z3");
      lcd.setCursor(8, 0);
      lcd.print("Vo ");
      break;

    case 1:
      //lcd.clear();  //     if i uncomment this line menu scrolling is not working
      lcd.print("#1 B ");
      lcd.print("  R ");
      lcd.setCursor(11, 0);
      lcd.print("UR");
      lcd.setCursor(0, 1);
      lcd.print("a ");
      lcd.print( "amp "   );
      lcd.setCursor(10, 1);
      lcd.print("f ");
      break;

    case 2:
      lcd.clear();
      lcd.setCursor(0, 0);
      lcd.setCursor(0, 1);
      lcd.print(" #2");
      break;

    case 3:
      lcd.clear();
      lcd.print("#3");
      lcd.setCursor(12, 0);
      lcd.print("U3");
      break;

    case 4:
      lcd.clear();
      lcd.print("#4 Z ");
      lcd.print("z2");
      lcd.setCursor(0, 1);
      lcd.print(" abc ");
      break;
    case 5:
      lcd.clear();
      lcd.print("#5 ");
      lcd.print(" A ");
      lcd.setCursor(0, 1);
      lcd.print("U1");
      lcd.print(" V ");
      break;

    case 6:
      lcd.clear();
      lcd.print("#6");           //spare
      lcd.print(" A stadion " );
      lcd.setCursor(0, 1);
      lcd.print(" wood ");
      break;

    case 7:
      lcd.clear();
      lcd.print("# 7");
      lcd.setCursor(0, 1);
      lcd.print(" nnnnn");
      break;
  }

  //+++++++++++++++++++++++++++++++++   menu end    +++++++++++++++++++++++
}
//==============================  loop end ===================
2

Try to use delay before LCD clear it was a Hardware glitch from the lcd.

3

Hello tom321

consider:

byte lcdNumCols = 16;
#include <LcdBarGraph.h>
#include <LiquidCrystal.h>
LiquidCrystal lcd(PC15, PC14, PB5, PB6, PB8, PB9);
//LcdBarGraph lbg(&lcd, lcdNumCols);  // -- creating
LcdBarGraph lbgURx(&lcd, 4, 0, 0); // -- First line at column 0
LcdBarGraph lbgUbal(&lcd, 4, 0, 1); // -- Second line at column 0
//------------------------
int botonState = 0, i;
byte lastButtonState = LOW;
byte ledState = LOW;
int t;
int z;
void setup()
{
  Serial.begin(115200);
  lcd.begin(16, 2);
  lcd.begin(2, lcdNumCols);
}
//=========================================== end setup  ===========================
void loop()
{
  //                      ++++++++++++++++++++++++++++++++  menu ++++++++++++++++++++++++++++++++
  if (digitalRead(PA15) == 0)
  {
    // botonState = (botonState + 1) % 3;
    botonState = (botonState + 1) % 8;
    lcd.clear();
    delay (200);
  }
  lcd.setCursor(0, 0);
  switch (botonState)
  {
    case 0:
      // lcd.clear();
      lcd.print("#0 z ");
      lcd.setCursor(6, 0);
      lcd.print("z3");
      lcd.setCursor(8, 0);
      lcd.print("Vo ");
      break;
    case 1:
      //// lcd.clear();  //     if i uncomment this line menu scrolling is not working
      lcd.print("#1 B ");
      lcd.print("  R ");
      lcd.setCursor(11, 0);
      lcd.print("UR");
      lcd.setCursor(0, 1);
      lcd.print("a ");
      lcd.print( "amp "   );
      lcd.setCursor(10, 1);
      lcd.print("f ");
      break;
    case 2:
      // lcd.clear();
      lcd.setCursor(0, 0);
      lcd.setCursor(0, 1);
      lcd.print(" #2");
      break;
    case 3:
      // lcd.clear();
      lcd.print("#3");
      lcd.setCursor(12, 0);
      lcd.print("U3");
      break;
    case 4:
      // lcd.clear();
      lcd.print("#4 Z ");
      lcd.print("z2");
      lcd.setCursor(0, 1);
      lcd.print(" abc ");
      break;
    case 5:
      // lcd.clear();
      lcd.print("#5 ");
      lcd.print(" A ");
      lcd.setCursor(0, 1);
      lcd.print("U1");
      lcd.print(" V ");
      break;
    case 6:
      // lcd.clear();
      lcd.print("#6");           //spare
      lcd.print(" A stadion " );
      lcd.setCursor(0, 1);
      lcd.print(" wood ");
      break;
    case 7:
      // lcd.clear();
      lcd.print("# 7");
      lcd.setCursor(0, 1);
      lcd.print(" nnnnn");
      break;
  }
  //+++++++++++++++++++++++++++++++++   menu end    +++++++++++++++++++++++
}
//==============================  loop end ===================
4

delay solved the problem, thanks.

1 Like
5

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