LCD(16x2)-Interface | Code | Circuit |Pin configuration | Program

 LCD(16x2)

Model number: HD44780

Other names: LCD Display, 16x2 LCD display module, LCD display module

Other related devices: OLED Display, Graphical LCD display, 16x 4 LCD Display

LCD pin diagram

 16x2 LCD Module

LCD-Pin-Diagram

Pin description

1	Vss	Ground
2	Vcc/Vdd	5v(Positive  terminal)
3	VE	Contrast (brightness adjustment)
4	RS	Register Select (to select Data mode or command mode)
5	R/W	Read / Write Operation
6	EN	Enable
7	D0	Data pin 0
8	D1	Data pin 1
9	D2	Data pin 2
10	D3	Data pin 3
11	D4	Data pin 4
12	D5	Data pin 5
13	D6	Data pin 6
14	D7	Data pin 7
15	A	Anode (Backlight positive terminal)
16	K	Cathode (Back light negative terminal)

Power supply pins

• Vdd – is the power supply positive pin
• Vss – is the power supply negative pin
• A – Anode terminal (positive terminal of Back Light LED)
• K – Cathode  terminal (Negative terminal of Back Light LED)

Contrast pin

• Vee – to adjust the Backlight LED brightness (connect 10k pot)

By adjusting the voltage across this pin brightness will be adjust.

Control pins

• RS – Register select, it is useful  to select the command mode or data mode of operation
•  RS=0 for command mode, whereas RS=1 for data mode.
• R/W – To perform the Read and write operation (Write Operation is an active LOW signal)
• En –Enable pin, we can assign the instructions by triggering the Enable pin.

 Data pins

D0-D8 = Usually it has 8-data pins. It supports two modes of operations.

• 8-bit data mode
• 4-bit data mode

You can select any one of the modes by using the commands, and there is no effect on performance.  

LCD interface with Arduino Uno

What is Arduino?

Now we design in 4-bit data mode

NOTE: 4-Bit mode, data pins  D4, D5, D6, D7 are used.

LCD-Interface with Arduino

• VSS, R/W, K (1,5,16) pins are connected to Ground
• Vdd, A (2, 15) pins are connected to POWER SUPPLY positive terminal.
• Vee is connected to 10K Potentiometer
• RS, EN, D4, D5, D6, D7  Pins are connected to any data pins but try to maintain them in order.

LCD_Arduino_Interface

NOTE: In the above circuit LCD 15, 16  pins are not shown, so you should take care of that connection

                15th pin is connected to VDD(5v), 16th pin is connected to Ground 

How to write a program  for LCD module

It is very simple because Arduino IDE has an inbuilt LCD design program you are no need to develop an LCD driver module. Just you have to follow the LCD instructions in Arduino IDE

Set of LCD instructions in Arduino IDE: Download Arduino IDE

• lcd.write( ) – Print the Character.
• Ex: lcd.write('M'); 
• lcd.clear() - clear the display
• lcd.Display() - Turn ON the display
• lcd.begin ()- setup the LCD number of Rows  and columns.
• Ex: lcd.begin(16,2);
• lcd.print() – Print data
• Ex: lcd.print("Mahesh");
• lcd.NoDisplay() - Turn OFF the display
• lcd.setCursor() – Set the Cursor position
• Ex: lcd.setCursor(3,1);
• lcd.noBlink() – Cursor blink.
• lcd.blink() – cursor No blink.
• lcd.cursor() - Turn on the cursor
• lcd.noCursor() - Turn off the cursor
•  lcd.leftToRight() - go left for the next letter
• lcd.rightToLeft() - go right for the next letter
• lcd.home() - go to (0,0)
• lcd.scrollDisplayLeft() - scroll one position left
• lcd.scrollDisplayRight() - scroll one position right
• lcd.autoscroll() - set the display to automatically scroll
•  lcd.noAutoscroll() - turn off automatic scrolling

NOTE:  All the above functions  are predefined and case sensitive.

Program 1:  Print “HELLO WORLD”

Implementation Steps

• Make the hardware connections properly.
• Include the “LiquidCrystal.h “ header file
• Initialize the LCD interfacing pins corresponding to the hardware
• lcd.begin()- setup the LCD number of Rows and columns.
• lcd.setCursor() – Set the Cursor position, where you want to print data.
• Example: lcd.setCursor(2,1) – data print from 2^nd column, 1- Row                                lcd.setCursor(4,0) – data print from 4^TH  column, 0- Row
• lcd.print(“HELLO WORLD”) – Print data “HELLO WORLD”.

Code

 

 program2: print alphabets and numbers

LCD_Arduino_Interface

Code

#include<LiquidCrystal.h> const int rs = 2, en = 3, d4 = 4, d5 = 5, d6 = 6, d7 = 7; LiquidCrystal lcd(rs, en, d4, d5, d6, d7); void setup() { lcd.begin(16, 2); //LCD initialisation } void loop() { lcd.setCursor(5, 0); //set cursor column 5 ,row 0 lcd.print("WELCOME"); lcd.setCursor(0,1); // set cursor coloumn 0, row 1 lcd.print(1234); //print numeric value lcd.setCursor(12,1); //set cursor at 12 column ,row 1 lcd.write('A');// print single character lcd.setCursor(12,1); //set cursor at 12 column ,row 1 lcd.write('A');// print single character lcd.setCursor(13,1); //set cursor at 13 column ,row 1 lcd.write('B');// print single character lcd.setCursor(14,1); //set cursor at 14 column ,row 1 lcd.write('C');// print single character lcd.setCursor(15,1); //set cursor at 15 column ,row 1 lcd.write('D');// print single character }

DOWNLOAD CODE

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Reference

https://www.arduino.cc/en/Tutorial/HelloWorld 

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