2004A LCD Blue Display 20X4 Character 5V with HD44780

1. The 2004A LCD
2. Specification
3. I2C Addressing
4. Library Functions
5. Schematic
6. IIC/I2C/TWI/SPI Serial Interface
7. References

This is a 20x4 Arduino compatible LCD display module with high speed I2C interface. It is able to display 20x4 characters on two lines, white characters on a blue background.

The 2004A LCD

The above LCD come with out the I2C adapter soldered on the rear. It is best to order LCD with the adater solderin. Do not get caught as I did and have to source then afterwards and spent time soldering them in place. Most implementations of LCD screens call fo rthe I2C connections as the alternative is six precious pin to run th LCD.

This is the unit you should buy (NOTE the I2C adaptor on the rear):


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Specification

• The module is a low-power consumption character LCD Module
• Built-in controller.
• The 2004A character LCD module is designed to display letters, numbers, symbols, dot matrix.
• Support 4-bit and 8-bit data transfer mode.
• Display contents: 20 characters x 4 lines
• Operating voltage: + 5V
• Display screen: Blue Screen (White Text, Blue backlight)
• Operating temperature: -10°C - +60°C
• Controller: SPLC780
• Module size(W x H x T): 98.0 x 60.0 x 14.0mm
• Viewing area(W x H): 76.0 x 26.0mm
• Character size(W x H): 2.95 x 4.75mm
• Dot size:(W x H): 0.55 x 0.55mm

I2C Addressing

A2	A1	A0  Address
0	0	0	0x20
0	0	1	0x21
0	1	0	0x22
0	1	1	0x23
1	0	0	0x24
1	0	1	0x25
1	1	1	0x26
1	1	1	0x27

Library Functions

• LiquidCrystal_I2C() //set the LCD address for a 16 chars and 2 line display
• init() //Initialization for the LCD
• clear() //clear display, set cursor position to zero
• home() //set cursor position to zero
• createChar() //Fill the first 8 CGRAM locations with custom characters
• setCursor() //set the position of the cursor
• cursor() //Turns the underline cursor on
• noCursor() //Turns the underline cursor off
• blink() //Turn on the blinking cursor
• noBlink() //Turn off the blinking cursor
• display() //Turn the display on(quickly)
• noDisplay() //Turn the display 0ff(quickly)
• backlight() //Turn the backlight on
• noBacklight() //Turn the backlight off
• scrollDisplayLeft() //Make the display scroll left without changing the RAM
• scrollDisplayRight() //Make the display scroll right without changing the RAM
• autoscroll() //This will 'right justify' text from the cursor
• noAutoscroll() //This will 'left justify' text from the cursor
• leftToRight() //This is for text that flows Left to Right
• rightToLeft() //This is for text that flows Right to Left

Schematic

The PCA8574/74A provide general purpose remote I/O expansion for most microcontroller families via the two-line bidirectional I2C-bus (serial clock (SCL), serial data (SDA)).
http://image.dfrobot.com/image/data/DFR0154/PCA8574%20Datasheet.pdf

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IIC/I2C/TWI/SPI Serial Interface

This is a IIC/I2C/TWI/SPI Serial Interface. As the pin resources of Arduino controller is limited, with the I2C interface module, you will be able to realize data display via only 2 wires. If you already has I2C devices in the project, this LCD module uses the same pin resources.

• I2C Address selectable: 0X20~0X27 (default address is 0X20)
• Supply voltage: 5V
• Backlight and contrast is adjusted by potentiometer
• Supplied with two I2C interface, I2C intefrace can be connected by Dupont Line or I2C dedicated cable
• Compatible with the 1602 LCD and the 2004 LCD

I²C (Inter-Integrated Circuit), pronounced I-squared-C, is a synchronous, multi-master, multi-slave, packet switched, single-ended, serial computer bus invented in 1982 by Philips Semiconductor (now NXP Semiconductors). It is widely used for attaching lower-speed peripheral ICs to processors and microcontrollers in short-distance, intra-board communication. Alternatively I²C is spelled I2C (pronounced I-two-C) or IIC (pronounced I-I-C).

http://image.dfrobot.com/image/data/DFR0154/PCA8574%20Datasheet.pdf

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References