LCD2004 20×4 Blue LCD Display

The LCD2004 20×4 Blue LCD Display provides a 20-character x 4-line LCD with a parallel interface for control by a uC.

These displays are straightforward to use and are a great way to provide a user interface on many projects where you need more info than simple LED indicators or 7-Segment displays can provide since these are full alphanumeric displays with 4 lines of 20 characters each for a total of 80 characters which is a fair amount of info.

For an interactive display, pairing this type of display with a rotary encoder to navigate and select menu items on display can provide a very nice user interface.

Parallel Interface

This display incorporates a parallel interface that can operate using an 8-bit (byte) mode or a 4-bit (nibble) mode.  The 8-bit mode uses data pins D0-D7, and the 4-bit mode uses the upper data pins D4-D7.

In practice, the 4-bit mode is normally used as it saves 4 pins on the MCU and maximizing communication speeds with the display is generally not a concern.  The LiquidCrystal.h library makes the difference between using the two modes transparent to the user.

If it is desirable to minimize the pins used on the MCU even further, check out the version with an I2C interface below, which uses only 2 pins plus power and ground.

Module Connections

• VSS =        Connect to system ground.  This ground needs to be in common with the MCU.
• VDD =      Connect to 5V.  This can come from the MCU or be a separate power supply.
• VO =          Display contrast.  Connect to approximately a 20K potentiometer between 5V and ground to adjust the display’s contrast.
• RS =           Register Select.  Selects the command or data register.  A logic LOW = Command, HIGH = Data.
• RW =        Read / Write.  The display is a write-only device.  This pin is grounded to keep it in write mode at all times.
• E =              Enable.  This pin enables writing to the display when active LOW
• D0 – D7 = Data pins.  D0-D7 is used for 8-bit mode.  D4-D7 used for 4-bit mode
• A =              Backlight Anode.  Connects to 5V.
• K =              Backlight Cathode.  Connects to ground

Specifications:

Package includes:1 x LCD2004 20×4 Blue LCD Display

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Notes:

1. There may be slight size Deviations due to manual Measurement, different Measuring methods and tools.
2. The picture may not reflect the actual colour of the item because of different Photographing lights, angles and display monitors.