16×2 LCD display pin diagram and its pin descriptions

A 16×2 LCD means it can display 16 characters per line and there are 2 such lines. In this LCD each character is displayed in 5×7 pixel matrix. This LCD has two registers, namely, Command and Data.

The command register stores the command instructions given to the LCD. A command is an instruction given to LCD to do a predefined task like initializing it, clearing its screen, setting the cursor position, controlling display etc. The data register stores the data to be displayed on the LCD. The data is the ASCII value of the character to be displayed on the LCD.
Pin diagram
1.PNG
Pin description
 Pin No
 Function
 Name
1
Ground (0V)
Ground
2
Supply voltage; 5V (4.7V – 5.3V)
 Vcc
3
Contrast adjustment; through a variable resistor
 VEE
4
Selects command register when low; and data register when high
Register Select
5
Low to write to the register; High to read from the register
Read/write
6
Sends data to data pins when a high to low pulse is given
Enable
7
8-bit data pins
DB0
8
DB1
9
DB2
10
DB3
11
DB4
12
DB5
13
DB6
14
DB7
15
Backlight VCC (5V)
Led+
16
Backlight Ground (0V)
Led-

Example LCD interface with Arduino UNO pin diagram

LCD-thermometer-arduino.png

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