16x2 LCD Display (Green Backlight) Q3 C1

Specifications of 16x2 LCD Display Module:

Operating Voltage: 4.7V to 5.3V

Operating Current 1mA (without backlight)

Can display (16x2) 32 Alphanumeric Characters

Custom Characters Support

Works in both 8-bit and 4-bit Mode

The 16x2 LCD pinout diagram is shown below. As you can see the module has (from right) two power pins Vss and Vcc to power the LCD. Typically Vss should be connected to ground and Vcc to 5V, but the LCD can also operate from voltage between 4.7V to 5.3V. Next, we have the control pins namely Contrast (VEE), Register Select (RS), Read/Write (R/W) and Enable (E). The Contrast pin is used to set the contrast (visibility) of the characters, normally it is connected to a 10k potentiometer so that the contrast can be adjusted. The Read/Write pin will be grounded in most cases because we will only be writing characters to the LCD and not read anything from it. The Register Select (RS) and Enable pin (E) pin are the control pins of the LCD and will be connected to the digital pins GPIO pins of the microcontroller. These pins are used to instruct the LCD where place a character when to clear it etc.

16x2 LCD Display Pinout

From DB0 to DB7 we have our eight Data Pins which are used to send information about the characters that have to be displayed on the LCD. The LCD can operate in two different modes, in the 4-bit Mode only pins DB4 to DB7 will be used and the pins DB0 to DB3 will be left idle. In 8-bit Mode, all the eight-pin DB0 to DB7 will be used. Most commonly the 4-bit mode is preferred since it uses only 4 Data pins and thus reduces complexity and GPIO pin requirement on the microcontroller. Finally, we have the LED+ and LED- pins which are used to power the backlight LED inside our Display module. Normally the LED+ pin is connected to 5V power through a 100 ohm current limiting resistor and the LED- pin is connected to Ground.

Pin Description of 16x2 LCD Display:

Pin No.

Pin Symbol

Pin Name

Connection Description

1

VSS

Ground

Connected to Ground

2

VCC

Power

Connected to Power (Typically 5V)

3

VEE

Contrast

Connected to potentiometer 10k to control contrast

4

RS

Register Select

Connected to Microcontroller

5

R/W

Read/Write

Connected to Ground

6

E

Enable

Connected to Microcontroller

7

DB0

Data Pin 0

Connected to Microcontroller based on 4-bit or 8-bit Working Mode

8

DB1

Data Pin 1

9

DB2

Data Pin 2

10

DB3

Data Pin 3

11

DB4

Data Pin 4

12

DB5

Data Pin 5

13

DB6

Data Pin 6

14

DB7

Data Pin 7

15

LED+

LED Positive

Connected to 5V through 100 ohm Resistor

16

LED-

LED Negative

Connected to Ground

The dimensions of 16x2 LCD display is shown below