Serial LCD for Arduino LCM1602 IIC V1 Serial Board LCD for UNO, MEGA & Duemilanove. The I2C/SPI communication with microcontroller does not take a Shield position, simple 4 wire connection. I am using these for a simple display project. Took some time to sort through getting it working. Heres the scoop. This project shows you how to create a serial LCD module that you can drive from any serial RS232 interface. An RS232 level translator and an HD44780 LCD. Serial LCD display Software. The software is contained in two files (note there are many more created by the compiler): 16F877A-serial-lcd.c bit.h. Bit.h contains bit manipulation macros.

1 Jun 2014CPOL

A new serial LCD library for Arduino with the power of 'Print' class

Introduction

LCD displays are mostly used in Arduino-based systems to show output of your application. They are cheap, widely-available, easy-to-use. Therefore, you can find many kinds of LCD display on the market. One drawback is that it occupies to many pins on your Arduino board. As a solution, serial LCD displays has emerged, thanks to kindhearted manufacturers :)

Background

Arduino IDE comes with a LiquidCrystal library ([3]) for Hitachi-HD44780-based LCDs ([4]). You command the controller by selecting & writing registers according to your needs. In 4-bit usage, you need 6 digital pin of your Arduino out of 14. What a waste.

Figure 1: A 2x16 LCD

Some functionality provided by Hitachi-based controller:

Positioning cursor
Setting cursor type (hide, underline, blink)
Scrolling display (to-left, to-right)
Display on/off
Clear screen

LiquidCrystal library exposes those functions by commanding Hitachi controller. Dedicated pins are specified in the constructor.

Let's see an example:

A LiquidCrystal instance (lcd) is created with a given pin configuration at the beginning of the code. The library uses this pin configuration to send commands and data to LCD.

In setup function, LCD is initialized with its columns & rows count. The library uses this information when it sets cursor position.

For example, if you want to move cursor to second column of second row, target cursor position is decided by using values provided in begin function. The next print will start from that position.

I hope this sample is enough to see how to use an LCD with LiquidCrystal library.

Serial LCD

Now, it is time to talk about serial LCD. When it comes to serial LCD, those low-level driving issues are diverted to another microcontroller. You command this microcontroller, and it commands LCD (Hitachi controller). To do this, it provides you a serial interface with an only one line. Information flow is one-way, from Arduino to serial LCD, therefore it needs only one digital pin of your Arduino. You use only the transmit line of HardwareSerial ([7]) or SoftwareSerial ([8]) to communicate with your serial LCD.

Figure 2: A serial LCD (connected with SoftwareSerial)

What I have done in this library is to implement communication protocol ([2]) with my specific serial LCD ([1]). My implementation has similar functionality with LiquidCrystal as you may expect since both are based on Hitachi controller.

Serial Lcd Display Project Using 8051

Commands to serial LCD are composed of 1-byte directives with parameters. To drive serial LCD, you send those commands over serial transmit.

Command: Set backlight
Command byte: 0x80
Parameter: 0x00-0xFF (0-255). corresponds to brightness between 0%-100%

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Command: Set baudrate (after reset), default 9600
Command byte: 0x81
Parameters: 0x00-0x0A (0-10), corresponding values 300, 1200, 2400, 2400, 9600, 14400, 19200, 28800, 38400, 57600, 115200

Following commands control LCD's behavior and all are preceded by 0xFE command byte.

Command: Clear screen, set cursor position to 0
Command byte: 0x01 (no parameter)

Command: Move cursor right
Command byte: 0x14 (no parameter)

Command: Move cursor left
Command byte: 0x10 (no parameter)

Command: Scroll display right
Command byte: 0x1C (no parameter)

Command: Display off (backlight doesn't change)
Command byte: 0x08 (no parameter)

Command: Display on
Command byte: 0x0C (no parameter)

Command: Underline cursor
Command byte: 0x0E (no parameter)

Command: Blink cursor
Command byte: 0x0D (no parameter)

Command: Cursor off (if display is ON)
Command byte: 0x0C (no parameter)

Command: Set cursor position
Command byte: 0x80
Parameter: 1-byte position index, starting from 0 (top-left)

Command: Toggle splash screen
Command byte: 0x1E (no parameter)

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(I had developed another library ([9]) for serial LCD, but it is not good enough in terms of design & functionality. I prefer to count it as an experimental study.)

Using the code

Here is the class declaration of SerialLcd2:

What I did here is to implement serial communication protocol and some other handy functions.

Let's see an example.

To connect via hardware serial (Serial), we first need to initialize serial port of Arduino. I haven't changed my LCD's baud rate, therefore baud rate of the connection will be 9600 bps.

If we want to connect with SoftwareSerial, similar initialization is needed except we have to reserve pins for SoftwareSerial.

Then create a SerialLcd2 instance with its serial Stream <