Lcd Projects

BIG LCD ARDUINO PROJECTS FOR TEXT SCROLLING…

what is lcd?

LCD is a liquid crystal display .it is used for display the data in various application, small to big screen LCD use for as per your data and rerquirements

CONNECTION LCD AND ARDUINO PIN

Depends upon you to change the Arduino program to pin, but in my case, the pin is defined as rs = 11, en = 9, d0 = 5, d1 = 4, d2 = 3, d3 = 2; Read the LCD pdf to first understand the which pin is used to the power supply and which one is used for data transfer pin, the connection will be tight to send data accurately if pin losing character some time invisible if you don’t use potentiometer then this pin to the ground.

#include

const int rs = 11, en = 9, d0 = 5, d1 = 4, d2 = 3, d3 = 2;

const double analogPin = A4;

LiquidCrystal lcd(rs, en, d0, d1, d2, d3);

int x = 0;

const char custom[][8] PROGMEM = { // Custom character definitions { 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00 }, // char 1 { 0x18, 0x1C, 0x1E, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F }, // char 2 { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x0F, 0x07, 0x03 }, // char 3 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F }, // char 4 { 0x1F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1E, 0x1C, 0x18 }, // char 5 { 0x1F, 0x1F, 0x1F, 0x00, 0x00, 0x00, 0x1F, 0x1F }, // char 6 { 0x1F, 0x00, 0x00, 0x00, 0x00, 0x1F, 0x1F, 0x1F }, // char 7 { 0x03, 0x07, 0x0F, 0x1F, 0x1F, 0x1F, 0x1F, 0x1F } // char 8

};

// BIG FONT Character Set

// - Each character coded as 1-4 byte sets {top_row(0), top_row(1)... bot_row(0), bot_row(0)..."}

// - number of bytes terminated with 0x00; Character is made from [number_of_bytes/2] wide, 2 high

// - codes are: 0x01-0x08 => custom characters, 0x20 => space, 0xFF => black square

const char bigChars[][8] PROGMEM = { { 0x20, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // Space

{ 0xFF, 0x07, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // ! { 0x05, 0x05, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00 }, // " { 0x04, 0xFF, 0x04, 0xFF, 0x04, 0x01, 0xFF, 0x01 }, // # { 0x08, 0xFF, 0x06, 0x07, 0xFF, 0x05, 0x00, 0x00 }, // $ { 0x01, 0x20, 0x04, 0x01, 0x04, 0x01, 0x20, 0x04 }, // % { 0x08, 0x06, 0x02, 0x20, 0x03, 0x07, 0x02, 0x04 }, // & { 0x05, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // ' { 0x08, 0x01, 0x03, 0x04, 0x00, 0x00, 0x00, 0x00 }, // ( { 0x01, 0x02, 0x04, 0x05, 0x00, 0x00, 0x00, 0x00 }, // ) { 0x01, 0x04, 0x04, 0x01, 0x04, 0x01, 0x01, 0x04 }, // * { 0x04, 0xFF, 0x04, 0x01, 0xFF, 0x01, 0x00, 0x00 }, // + { 0x20, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // { 0x04, 0x04, 0x04, 0x20, 0x20, 0x20, 0x00, 0x00 }, // - { 0x20, 0x04, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // . { 0x20, 0x20, 0x04, 0x01, 0x04, 0x01, 0x20, 0x20 }, // / { 0x08, 0x01, 0x02, 0x03, 0x04, 0x05, 0x00, 0x00 }, // 0 { 0x01, 0x02, 0x20, 0x04, 0xFF, 0x04, 0x00, 0x00 }, // 1 { 0x06, 0x06, 0x02, 0xFF, 0x07, 0x07, 0x00, 0x00 }, // 2 { 0x01, 0x06, 0x02, 0x04, 0x07, 0x05, 0x00, 0x00 }, // 3 { 0x03, 0x04, 0xFF, 0x20, 0x20, 0xFF, 0x00, 0x00 }, // 4 { 0xFF, 0x06, 0x06, 0x07, 0x07, 0x05, 0x00, 0x00 }, // 5 { 0x08, 0x06, 0x06, 0x03, 0x07, 0x05, 0x00, 0x00 }, // 6 { 0x01, 0x01, 0x02, 0x20, 0x08, 0x20, 0x00, 0x00 }, // 7 { 0x08, 0x06, 0x02, 0x03, 0x07, 0x05, 0x00, 0x00 }, // 8 { 0x08, 0x06, 0x02, 0x07, 0x07, 0x05, 0x00, 0x00 }, // 9 { 0xA5, 0xA5, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // : { 0x04, 0x05, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, // ; { 0x20, 0x04, 0x01, 0x01, 0x01, 0x04, 0x00, 0x00 }, // < { 0x04, 0x04, 0x04, 0x01, 0x01, 0x01, 0x00, 0x00 }, // = { 0x01, 0x04, 0x20, 0x04, 0x01, 0x01, 0x00, 0x00 }, // > { 0x01, 0x06, 0x02, 0x20, 0x07, 0x20, 0x00, 0x00 }, // ? { 0x08, 0x06, 0x02, 0x03, 0x04, 0x04, 0x00, 0x00 }, // @ { 0x08, 0x06, 0x02, 0xFF, 0x20, 0xFF, 0x00, 0x00 }, // A { 0xFF, 0x06, 0x05, 0xFF, 0x07, 0x02, 0x00, 0x00 }, // B { 0x08, 0x01, 0x01, 0x03, 0x04, 0x04, 0x00, 0x00 }, // C { 0xFF, 0x01, 0x02, 0xFF, 0x04, 0x05, 0x00, 0x00 }, // D { 0xFF, 0x06, 0x06, 0xFF, 0x07, 0x07, 0x00, 0x00 }, // E { 0xFF, 0x06, 0x06, 0xFF, 0x20, 0x20, 0x00, 0x00 }, // F { 0x08, 0x01, 0x01, 0x03, 0x04, 0x02, 0x00, 0x00 }, // G { 0xFF, 0x04, 0xFF, 0xFF, 0x20, 0xFF, 0x00, 0x00 }, // H { 0x01, 0xFF, 0x01, 0x04, 0xFF, 0x04, 0x00, 0x00 }, // I { 0x20, 0x20, 0xFF, 0x04, 0x04, 0x05, 0x00, 0x00 }, // J { 0xFF, 0x04, 0x05, 0xFF, 0x20, 0x02, 0x00, 0x00 }, // K { 0xFF, 0x20, 0x20, 0xFF, 0x04, 0x04, 0x00, 0x00 }, // L { 0x08, 0x03, 0x05, 0x02, 0xFF, 0x20, 0x20, 0xFF }, // M { 0xFF, 0x02, 0x20, 0xFF, 0xFF, 0x20, 0x03, 0xFF }, // N { 0x08, 0x01, 0x02, 0x03, 0x04, 0x05, 0x00, 0x00 }, // 0 { 0x08, 0x06, 0x02, 0xFF, 0x20, 0x20, 0x00, 0x00 }, // P { 0x08, 0x01, 0x02, 0x20, 0x03, 0x04, 0xFF, 0x04 }, // Q { 0xFF, 0x06, 0x02, 0xFF, 0x20, 0x02, 0x00, 0x00 }, // R { 0x08, 0x06, 0x06, 0x07, 0x07, 0x05, 0x00, 0x00 }, // S { 0x01, 0xFF, 0x01, 0x20, 0xFF, 0x20, 0x00, 0x00 }, // T { 0xFF, 0x20, 0xFF, 0x03, 0x04, 0x05, 0x00, 0x00 }, // U { 0x03, 0x20, 0x20, 0x05, 0x20, 0x02, 0x08, 0x20 }, // V { 0xFF, 0x20, 0x20, 0xFF, 0x03, 0x08, 0x02, 0x05 }, // W { 0x03, 0x04, 0x05, 0x08, 0x20, 0x02, 0x00, 0x00 }, // X { 0x03, 0x04, 0x05, 0x20, 0xFF, 0x20, 0x00, 0x00 }, // Y { 0x01, 0x06, 0x05, 0x08, 0x07, 0x04, 0x00, 0x00 }, // Z { 0xFF, 0x01, 0xFF, 0x04, 0x00, 0x00, 0x00, 0x00 }, // [ { 0x01, 0x04, 0x20, 0x20, 0x20, 0x20, 0x01, 0x04 }, // Backslash { 0x01, 0xFF, 0x04, 0xFF, 0x00, 0x00, 0x00, 0x00 }, // ] { 0x08, 0x02, 0x20, 0x20, 0x00, 0x00, 0x00, 0x00 }, // ^ { 0x20, 0x20, 0x20, 0x04, 0x04, 0x04, 0x00, 0x00 } // _

};

byte col,row,nb=0,bc=0; // general

byte bb[8]; // byte buffer for reading from PROGMEM

//*****************************************************************************************//

// Initial Setup

//*****************************************************************************************//

void setup() {

lcd.begin(20, 4);

for (nb=0; nb<8; nb++ ) {

// create 8 custom characters

for (bc=0; bc<8; bc++) bb[bc]= pgm_read_byte( &custom[nb][bc] );

lcd.createChar ( nb+1, bb );

}

lcd.clear();

writeBigString("HELLO", 0, 0);

lcd.setCursor(0, 2);

lcd.print(F("CHAMPION MFG.CO. "));

delay(500);

lcd.clear();

}

//*****************************************************************************************//

// MAIN LOOP

//*****************************************************************************************//

void loop() {
lcd.scrollDisplayLeft();

delay(5000);

lcd.setCursor(0, 0);

lcd.print(F("CHAMPION MFG.CO."));

writeBigString("SALES", 0,2);

}

// ********************************************************************************** //

// SUBROUTINES

// ********************************************************************************** //

// writeBigChar: writes big character 'ch' to column x, row y; returns number of columns used by 'ch'

int writeBigChar(char ch, byte x, byte y) {

if (ch < ' ' || ch > '_') return 0;

// If outside table range, do nothing

nb=0;

// character byte counter

for (bc=0; bc<8; bc++) {

bb[bc] = pgm_read_byte( &bigChars[ch-' '][bc] ); // read 8 bytes from PROGMEM

if(bb[bc] != 0) nb++;

}

bc=0;

for (row = y; row < y+2; row++) {

for (col = x; col < x+nb/2; col++ ) {

lcd.setCursor(col, row);

// move to position

lcd.write(bb[bc++]);

// write byte and increment to next

}

// lcd.setCursor(col, row);

// lcd.write(' ');

// Write ' ' between letters

}

return nb/2-1;

// returns number of columns used by char

}

// writeBigString: writes out each letter of string

void writeBigString(char *str, byte x, byte y) {

char c;

while ((c = *str++))

x += writeBigChar(c, x, y) +1;

}

// ********************************************************************************** //

// OPERATION ROUTINES

// ********************************************************************************** //

// FREERAM: Returns the number of bytes currently free in RAM

int freeRam(void)

{

extern int __bss_end, *__brkval;

int free_memory;

if((int)__brkval == 0) {

free_memory = ((int)&free_memory) - ((int)&__bss_end);

}

else {

free_memory = ((int)&free_memory) - ((int)__brkval);

}

return free_memory;

}

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