The basic idea about LCD interfacing.

1. PREPARED BY:- ROBOTICS CLUB

2. PREPARED BY:- ROBOTICS CLUB
Liquid Crystal Display (LCD):-
LCD is finding widespread use replacing LEDs because
 The declining prices of LCD
 The ability to display numbers, characters and graphics
Ease of programming for characters and graphics

3. PREPARED BY:- ROBOTICS CLUB
Liquid Crystal Display (LCD):-

4. PREPARED BY:- ROBOTICS CLUB
Liquid Crystal Display (LCD):-

5. PREPARED BY:- ROBOTICS CLUB
Pin Descriptions for LCD
Pin Symbol I/O Descriptions
1 VSS ----- Ground
2 VCC ----- +5 v power supply
3 VEE ----- Power supply to contrast
4 RS I Register Select( 0 for command register and 1
for data register)
5 __
R /W
I 1 for Read
0 for write
6 E I/O Enable
7-14 DB0-DB7 I/O The 8-bit data bus
15 LED + ----- Usually Connected t0 +5v of power supply
16 LED- ----- Connected to Ground

6. PREPARED BY:- ROBOTICS CLUB
Some Points to note while Programming
A high to low pulse should be provided in an enable pin for Write
Operation
A low to high pulse should be provided in an enable pin for Read
Operation
Bit D7 of LCD is busy flag which can be used to check if LCD is busy in its
own internal operation
Busy flag can be read when R/W =1 and RS=0 and a L to H pulse in enable
pin
NOTE:- It is recommended to check busy flag before writing any data to
LCD.

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LCD Command Codes
Code (Hex) Command to LCD Instruction Register
1 Clear display screen
2 Return home
4 Decrement cursor (shift cursor to left)
6 Increment cursor (shift cursor to right)
5 Shift display right
7 Shift display left
8 Display off, cursor off
A Display off, cursor on
C Display on, cursor off
E Display on, cursor blinking off
F Display on, cursor blinking

8. PREPARED BY:- ROBOTICS CLUB
CONTINUED…..
Code (Hex) Command to LCD Instruction Register
10 Shift cursor position to left
14 Shift cursor position to Right
18 Shift the entire display to the left
1C Shift the entire display to the Right
80 Force cursor to beginning to 1st line
C0 Force cursor to beginning to 2nd line
38 2 lines and 5x7 matrix

9. THANK YOU!!!!!!!!!!!!!!!!!