Why we Need to Display ?
There are some projects where we need to display instant result on Arduino Board . For Example Room Temperature,Fingerprint Attendance ,Games , Locking System,Ultrasound Sensor Distance,Voltage & Ampere,Digital Clock.
How To Connect Display with Arduino ?
Requirement
- Arduino Uno / Mega.
- LCD 16×2 .
- Wires.
- Male pin header / Female pin header.
- Potentiometer 10k.
- PCB to make custom shield for further use.
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Schematic
Result
Program
Its is also available in Arduino in Example-> LiquidCrystal -> Hello World .
Here are Some Changes so you Understand Better.
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
void setup() {
lcd.begin(16, 2);//Define What size of Lcd
lcd.print("hello, world!"); // Print or display on screen
delay(3000);//Diplay Upto 3sec
}
void loop() {
lcd.clear(); //It Set to clear all content on display.
lcd.print("WWW.AHIRLABS.COM"); // Print or display on screen 16Char
lcd.setCursor(0, 1); // Define Position
lcd.print(millis() / 1000);
delay(1000);//set delay according to need | avoid multiple delay while used lcd.
}
OUTPUT
LiquidCrystal Library Functions
1. Begin
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
void setup() {
lcd.begin(16, 2);//Define What size of Lcd
lcd.print("hello, world!"); // Print or display on screen
}
void loop() {
}
2. Clear
void loop(){
lcd.clear(); // Define after loop start.
/*
Rest of Code
*/
}
3. Print
// Method 1
lcd.print("TEST");
// Method 2
lcd.print(variable);
// Method 3
lcd.print(variable,type)
lcd.print(variable,HEX); //Hexadecimal
lcd.print(variable,DEC); //Decimal
lcd.print(variable,OCT); //Octal
lcd.print(variable,BIN); //Binary
// Method 4
int number = 5678;
lcd.print(String("1234 ") + String(number));
// Method 5
int A = 10;
int B = 20;
int C = A + B;
lcd.print(String(A) + String(" + ") + String(B) + String(" = ") + String(C));
// Method 6
lcd.print(A);
lcd.print(" + ");
lcd.print(B);
lcd.print(" = ");
lcd.print(C);
Method 1
Method 2
Method 3
Method 4
Method 5
Method 6
4. Write
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
void setup() {
lcd.begin(16, 2);//Define What size of Lcd
}
void loop() {
int var=100;
lcd.clear(); //It Set to clear all content on display.
lcd.setCursor(0, 1); // Define Position
lcd.write("Hello World!"); //Same as Print But basic Use To Print Character
delay(1000);//set delay according to need | avoid multiple delay while used lcd.
}
5. Set Cursor
lcd.setCursor(COLs, ROWs); lcd.setCursor(0, 0); // top left lcd.setCursor(15, 0); // top right lcd.setCursor(0, 1); // bottom left lcd.setCursor(15, 1); // bottom right
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
void setup() {
lcd.begin(16, 2);//Define What size of Lcd
}
void loop() {
lcd.clear();
lcd.setCursor(0, 0); // top left
lcd.print("TL");
lcd.setCursor(14, 0); // top right
lcd.print("TR");
lcd.setCursor(0, 1); // bottom left
lcd.print("BL");
lcd.setCursor(14, 1); // bottom right
lcd.print("BR");
delay(1000);
}
6. Create Char
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
byte heart[8] = {
B00000,
B01010,
B11111,
B11111,
B11111,
B01110,
B00100,
B00000
};
void setup() {
lcd.begin(16, 2);//Define What size of Lcd
lcd.createChar(0, heart);
}
void loop() {
int var=100;
lcd.clear(); //It Set to clear all content on display.
lcd.setCursor(0, 1); // Define Position
lcd.write(byte(heart));
lcd.print(var); // Print or display on screen
delay(1000);//set delay according to need | avoid multiple delay while used lcd.
}
7. Cursor
It Control the underscore-style cursor in Define Location
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
void setup() {
lcd.begin(16, 2);//Define What size of Lcd
lcd.print("hello, world!");
}
void loop() {
lcd.noCursor();
delay(500);
// Turn on the cursor:
lcd.cursor();
delay(500);
}
8. Scroll
Scroll text left and right.
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("hello, world!");
delay(1000);
}
void loop() {
// scroll one position right:
lcd.scrollDisplayLeft(); // Its Allow Flow Moving to left but Text is Going Right side
// wait a bit:
delay(500);
}
9. Text-Direction
Control which way text flows from the cursor.
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
//Movement Variable
bool movetoright=true;
char alphabet[20] = {"abcdefghijk"};
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// turn on the cursor:
lcd.cursor();
}
void loop() {
if(movetoright){
for(int i=0;i<11;i++){
lcd.clear();
lcd.write(alphabet);
lcd.setCursor(0,1);
lcd.print(i);
lcd.setCursor(3,1);
lcd.print("LTR");
lcd.leftToRight();
lcd.setCursor(i,0);
delay(1000);
}
movetoright = false;
}else{
for(int i=10;i>-1;i--){
lcd.clear();
lcd.write(alphabet);
lcd.setCursor(0,1);
lcd.print(i);
lcd.setCursor(3,1);
lcd.print("RTL");
lcd.rightToLeft();
lcd.setCursor(i,0);
delay(1000);
}
movetoright = true;
}
delay(1000);
}
10. Serial-Display
It Accepts serial input Store in Buffer And then displays it.it clear After Reset.
Need Serial Monitor To Send data Set Baud Rate.
In Arduino IDE : Examples -> LiquidCrystal -> SerialDisplay
#include <LiquidCrystal.h>
//DEFINE According to Need
#define RS 12
#define EN 11
#define D4 5
#define D5 4
#define D6 3
#define D7 2
//lcd is define namelcd(RS pin, EN pin, D4 pin, D5 pin, D6 pin, D7 pin)
LiquidCrystal lcd(RS, EN, D4, D5, D6, D7);
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// initialize the serial communications:
Serial.begin(9600);
}
void loop() {
// when characters arrive over the serial port...
if (Serial.available()) {
// wait a bit for the entire message to arrive
delay(100);
// clear the screen
lcd.clear();
// read all the available characters
while (Serial.available() > 0) {
// display each character to the LCD
lcd.write(Serial.read());
}
}
}
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Understanding Arduino Display LCD 16×2
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