Hi guys,
I use Arduino Mega 2560 R3 + Ramps 1.4 + RepRapDiscount Full Graphic control (ST7920 128X64).
I want to write my own program for a machine that i build, i want control the LCD through LiquidCrystal library so i inseeted the next line:

#include LiquidCrystal.h
//LiquidCrystal lcd(LCD_PINS_RS, LCD_PINS_ENABLE, LCD_PINS_D4, LCD_PINS_D5, LCD_PINS_D6, LCD_PINS_D7);
LiquidCrystal lcd(16, 23, 17, 25, 27, 29);

I managed to get the backgroung light on but nothing on the screen.
the full programm is:

void setup() {
  lcd.begin(LCD_WIDTH, LCD_HEIGHT);
  Serial.begin(9600);
  lcd.clear();
  lcd.print("Hello"); // 
  lcd.setCursor(4, 1);
  lcd.print("Initializing");
  delay(5000); //WAIT FOR STABILLIZATION

  pinMode(BEEPER,OUTPUT);
  digitalWrite(BEEPER,HIGH);
  delay(100);
  digitalWrite(BEEPER,LOW);
}

void loop() {
  lcd.setCursor(0, 1);
  lcd.print(millis() / 1000);
}

i think that to pind are wrong
anybody knows how to help?
Thanks!!

Edited 1 time(s). Last edit at 03/06/2021 05:45AM by SaarNeu93.

LiquidCrystal is for char based lcd's not pixel based.

"LiquidCrystal Library
This library allows an Arduino board to control LiquidCrystal displays (LCDs) based on the Hitachi HD44780 (or a compatible) chipset, which is found on most text-based LCDs. The library works with in either 4- or 8-bit mode (i.e. using 4 or 8 data lines in addition to the rs, enable, and, optionally, the rw control lines)."

From [www.arduino.cc]

You need to use U8glib.h (can also use U8g2lib.h, but example stayed with same version as used in marlin)

see [github.com] for an example arduino sketch using RAMPS and REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER

Edited 3 time(s). Last edit at 03/06/2021 08:19AM by Dust.

Thanks Alot
that helped me

Quote
Dust

see [github.com] for an example arduino sketch using RAMPS and REPRAP_DISCOUNT_FULL_GRAPHIC_SMART_CONTROLLER

Hi, Again
is there any chance to use rotary encoder instead of push buttons?
i searched the whole internet and nothing really came up.
Thanks!

Edit:
I found also the u8g2 library that has examples of rotary button and menu examples, but i flash the code to the arduino and only the backlight is on.

On the u8glib (working) the pinout is this:

// SPI Com: SCK = en = 23, MOSI = rw = 17, CS = di = 16
U8GLIB_ST7920_128X64_1X u8g(23, 17, 16);

On the u82glib (not working) the pinout should be this:

U8G2_ST7920_128X64_F_HW_SPI u8g2(U8G2_R0, /* CS=*/ 16, /* reset=*/ 17); // Feather HUZZAH ESP8266, E=clock=14, RW=data=13, RS=CS

here is a link for more information: Link

please help! thanks

Edited 1 time(s). Last edit at 03/08/2021 06:11AM by SaarNeu93.

That example uses a rotary encoder.

#define BTN_EN1 31
#define BTN_EN2 33
#define BTN_ENC 35

BTN_EN1 is left rotation,
BTN_EN2 is right rotation
BTN_ENC is pressing encoder in.


the code enve says this

void loop() {
  // Read the encoder and update encoderPos    
  encoder0PinNow = digitalRead(BTN_EN1);
  if ((encoder0PinALast == LOW) && (encoder0PinNow == HIGH)) {
    if (digitalRead(BTN_EN2) == LOW) {
      encoderPos++;
    } else {
      encoderPos--;
    }
  }
  encoder0PinALast = encoder0PinNow;

That lcd on ramps is not using hardware spi only the sd card is using hardware spi.

use U8G2_ST7920_128X64_1_SW_SPI

Quote
Dust
That example uses a rotary encoder.

#define BTN_EN1 31
#define BTN_EN2 33
#define BTN_ENC 35

BTN_EN1 is left rotation,
BTN_EN2 is right rotation
BTN_ENC is pressing encoder in.


the code enve says this

void loop() {
  // Read the encoder and update encoderPos    
  encoder0PinNow = digitalRead(BTN_EN1);
  if ((encoder0PinALast == LOW) && (encoder0PinNow == HIGH)) {
    if (digitalRead(BTN_EN2) == LOW) {
      encoderPos++;
    } else {
      encoderPos--;
    }
  }
  encoder0PinALast = encoder0PinNow;

Ok, so i managed to get the encoder working .. i modified dome of the code to show menu of =[A,B,C]
it does show the menu, and it does scroll up and down (somwtimes) but i have to rotate the encoder like 1/4 of a round to get the "scrolling" working (either direction).

#include 
#include 
#include 

// SPI Com: SCK = en = 23, MOSI = rw = 17, CS = di = 16
U8GLIB_ST7920_128X64_1X u8g(23, 17, 16);

#define BTN_EN1         31              // Left Rotation
#define BTN_EN2         33              // Right Rotation
#define BTN_ENC         35              // Pressing Encoder In.

//int selectionButton = 31, selectionButtonState, selectionButtonLastState = 0, cntSelectionButtonPressed = 1, cntSelectionButtonPressed2ForMenu2 = 0; //A1
//int menuButton = 33 , menuButtonState, menuButtonLastState = 0; // A0
//int scrollDownButton = 35 , scrollDownButtonState, scrollDownButtonLastState = 0; //A3
//boolean mainMenu = false;


int LastscrollRight = 0; 
int LastscrollLeft = 0; 
int caseNum = 1; 
boolean LastpushButton = false; 
int scrollRight = 0;
int scrollLeft = 0;
int pushButton = 0;
int encoderPos = 1;                     //Current encoder position
int encoder0PinALast;                   //Used to decode rotory encoder, last value
int encoder0PinNow;                     //Used to decode rotory encoder, current value
char posStr[4];                         //Char array to store encoderPos as a string  
char tmp_string[16];


void setup() {
  pinMode(BTN_EN1, INPUT);              // Set BTN_EN1 as an unput, half of the encoder
  digitalWrite(BTN_EN1, HIGH);          // turn on pullup resistors
  pinMode(BTN_EN2, INPUT);              // Set BTN_EN2 as an unput, second half of the encoder
  digitalWrite(BTN_EN2, HIGH);          // turn on pullup resistors
  pinMode(BTN_ENC, INPUT);              // Set BTN_ENC as an unput, encoder button
  digitalWrite(BTN_ENC, HIGH);          // turn on pullup resistors
  u8g.setFont(u8g_font_helvR08);        //Set the font for the display
  u8g.setColorIndex(1);                 // Instructs the display to draw with a pixel on. 
}

void loop() {
 Serial.begin(9600);
 scrollRight = digitalRead(BTN_EN2);
 scrollLeft = digitalRead(BTN_EN1);
 pushButton = digitalRead(BTN_ENC);

//   Read the encoder and update encoderPos    
  encoder0PinNow = digitalRead(BTN_EN2);
  if ((encoder0PinALast == HIGH) && (encoder0PinNow == LOW)) {
    if (digitalRead(BTN_EN2) == LOW) {
      encoderPos++;
    } else {
      encoderPos--;
    }
    if (encoderPos > 3 or encoderPos < 0){
      encoderPos = 1; 
    }
  }
  encoder0PinALast = encoder0PinNow;
//  Serial.println(scrollRight);
  Serial.println(encoderPos);
//  Serial.println(pushButton);

  u8g.firstPage();
  do{
    MainMenu();
  }while(u8g.nextPage());
}

void MainMenu(){
switch(encoderPos)
{

  case 1:
           u8g.setFont(u8g_font_6x13); 
           u8g.setPrintPos(15,15);
           u8g.print("> A");
           u8g.setPrintPos(15,25);
           u8g.print("  B");
           u8g.setPrintPos(15,35);
           u8g.print("  C");  
           break;
  case 2:     
           u8g.setFont(u8g_font_6x13); 
           u8g.setPrintPos(15,15);
           u8g.print("  A");
           u8g.setPrintPos(15,25);
           u8g.print("> B");
           u8g.setPrintPos(15,35);
           u8g.print("  C");  
           break;
           break;
  case 3:
           u8g.setFont(u8g_font_6x13); 
           u8g.setPrintPos(15,15);
           u8g.print("  A");
           u8g.setPrintPos(15,25);
           u8g.print("  B");
           u8g.setPrintPos(15,35);
           u8g.print("> C");  
           break;   
}
}

how do i update the menu more often or how should i make the scrolling more "smooth"

Thanks ALOT !

Edited 1 time(s). Last edit at 03/08/2021 08:53AM by SaarNeu93.