Description

Alphanumeric LCD 4×20 HD44780 – Blue LCD QC2004A

Universal alphanumeric LCD 4×20 , powered by 5 volts.

It is characterized by simple operation, high availability and numerous support for many microcontrollers.

With libraries, you can easily hook up the display to an Arduino and display subtitles. The library gives you the ability to select the column and row in which to display the inscription, or string of digits.

So you can display a great deal of information in a clear way.

The display is integral in the world of electronics, because sometimes the project will not be near a computer and there will be no way to display information on its screen.

If the display uses too many pins, you can buy an I2C converter so that the LCD will be connected through 4 wires (power +, minus -, SCL and SDA).

Product features

• Universal alphanumeric LCD display module 4×20 characters.
• 4×20 LCD display
• Blue backlighting
• White marks
• HD44780 compliant driver.
• Ability to define your characters
• In the standard set of libraries and sample programs downloaded from the Arduino environment is the LiquidCrystal library, which allows you to operate the display.
• Control – The display can be controlled in modes:
• 8-bit without reading the busy flag – eight data bus lines and two control lines (RS, E – RW connected to ground) are required for transmission.
• 8-bit with busy flag reading – eight data bus lines and three control lines (RS, E, RW) are required for transmission.
• 4-bit with read busy flag- four data bus lines and three control lines(RS, E, RW) are needed for transmission.
• 4-bit without reading the busy flag – transmission requires four data bus lines and two control lines (RS, E – RW connected to ground).

Our expert suggests

The display works with the liquid crystal library, but the following changes are needed: Connecting to the microcontroller: RS – pin 12, RW – pin 14, E – pin 11, D4 – pin 7, D5 – pin 8, D6 – pin 9, D7 – pin 10.

The program from the Arduino side looks as follows:

When we have an I2C converter soldered to the display Sketch presents itself like this:

Technical data

• Power supply: 5V
• Average current consumption: 10 mA
• Dimensions: 96x60x33.5
• Sign dimensions: 2.45 x 5.00 mm
• Operating temperature range: -20 to +70 °C

Connector outputs

1. VSS Mass
2. VDD Power +5V
3. V0 Contrast
4. RS Selection of display instruction register (low state) or data register(high state)
5. R/W Read (low state) / Write (high state)
6. E Unlocking the display
7. DB0
8. DB1
9. DB2
10. DB3
11. DB4
12. DB5
13. DB6
14. DB7
15. LED A Backlight power supply +5V
16. LED K Backlight weight

Video presentation – Connecting the LCD 1602 to the Arduino – a model with fewer characters

Example of connection to a microcontroller – The diagram shows the simplest way to connect the circuit to any microcontroller using a single-wire interface.

Instructions for 2×16 HD44780 LCD Display