LCD.pdf

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2 x16 Parallel LCD (#603-00006)

General Information

The 2 X16 Parallel LCD is an 8 bit or 4 bit parallel interfaced LCD.

This unit allows the user to display text, numerical data and custom

created characters.

The LCD uses the HD44780 series LCD driver from Hitachi, or

equivalent controller. The LCD is connected to a female 14-pin

connector for easy interface with the BS2p24/40 Demo Board

(#45187) and the Professional Development Board (#28138).

Though the device has the ribbon cable and 14-pin connector it may

also be hooked up manually using the diagram on the next page.

Technical Specifications

Cable length: 6” (152 mm)

Power requirements: 5.0 +VDC

2.95“ (75 mm)

.09“ (2.3 mm)

2-56 screw size

Dimensions may vary

Character size .12” x .2” (3 x 5 mm)

2.9“ (73.5 mm)

3.2“ (81 mm)

LCD Control from a BASIC Stamp

Parallax (www.parallax.com) publishes many circuits and examples to control LCDs. Most of these

examples are available for download from our web site. These examples are featured in StampWorks, the

Nuts and Volts of BASIC Stamps books, the free LCD Character Creator Software, and the BS2p Plus

Pack. Example codes are listed below for the BASIC Stamp 1 and 2 modules.

Red

Pin 1

Vdd

DB1

DB3

DB5

DB6

Vss

Con.

R/W

DB0

DB2

DB4

DB6

P10

P12

P11

To interface to the LCD in a 4-bit mode you will need set up the LCD in the following manner.

Stamp I/O pins

DB4

DB5

DB6

DB7

R/W

2317

4.7K

Ω

All

10k

Ω

10 k

Ω

pot

Vss

BASIC Stamp 1 code

' =========================================================================

' File...... Parallel_LCD.bs1

' Purpose... Parallel LCD Display Demo

' Author.... Parallax, Inc.

' E-mail.... support@parallax.com

' {$STAMP BS1}

' {$PBASIC 1.0}

' -----[ Program Description ]---------------------------------------------

' This program demonstrates using a Hitachi-compatible Parallel LCD Display

' -----[ I/O Definitions ]-------------------------------------------------

SYMBOL E = 0 ' Enable Pin. 1 = Enabled

SYMBOL RS = 3 ' Register Select. 0 = Instruction

SYMBOL RW = 2 ' Read / Write control. 0 = Write

' -----[ Variables ]-------------------------------------------------------

SYMBOL char = B3 ' Character sent to LCD

SYMBOL temp = B4 ' Temp Variable

' -----[ EEPROM Data ]-----------------------------------------------------

EEPROM ("Hello, this is the LCD demo.")

' -----[ Initialization ]--------------------------------------------------

Begin:

LET PINS = 0 ' Clear The Output Lines

LET DIRS = %11111000 ' One Input, 7 Outputs

PAUSE 200 ' Wait 200 ms For LCD To Reset

LOW RW ' Puts LCD Into Write Mode

Init_LCD:

LET PINS = %00110000 ' Wakes Up LCD

PULSOUT E,1 ' Send Data Three Times

PAUSE 10

PULSOUT E,1

PAUSE 10

PULSOUT E,1

PAUSE 10

LET PINS = %00100000 ' Function Set, 4-bit Operation

PULSOUT E,1

LET char = %00101000 ' Set 4-bit Operation

GOSUB Wr_LCD

LET char = 1 ' Clears The LCD Screen

GOSUB Wr_LCD

LET char = 6 ' Set Cursor Direction

GOSUB Wr_LCD

LET char = 14 ' Sets Cursor To Underline

GOSUB Wr_LCD

HIGH RS ' Prepare To Send Characters

' -----[ Program Code ]----------------------------------------------------

Main:

FOR B6 = 0 TO 27 ' Read Data From EEPROM To Display

READ B6, char

IF B6 = 15 THEN Next_Line

GOSUB Wr_LCD

Out:

END ' End Of Code

' -----[ Subroutines ]-----------------------------------------------------

Wr_LCD: ' Write The Character In B3 To LCD

temp = char & %11110000 ' Logical AND Data Of High Byte Of

' I/O Pins

PINS = PINS & %00001000 | temp ' Logical OR The Data Leaving RS

' Pin In An Unchanged State

PULSOUT E,1 ' Clocks Out Data

PAUSE 10

temp = char & %00001111 * 16 ' Logical AND Data To Low Byte Of

' I/O Pins And Shifts To The Left

PINS = PINS & %00001000 | temp ' Logical ORs The Data Leaving RS

' Pin In An Unchanged State

PULSOUT E,1 ' Clocks Out Data

PAUSE 100

RETURN

Next_line:

LOW RS

LET char = 128 + 64 ' Places Cursor On Line 2

GOSUB Wr_LCD

HIGH RS ' Puts LCD Into Display Mode

READ B6, char

GOSUB Wr_LCD

GOTO Out

BASIC Stamp 2, 2e and 2sx code

' =========================================================================

' File...... Parallel_LCD_2X16.bs2

' Purpose... Parallel LCD Display Demo

' Author.... Parallax, Inc.

' E-mail.... support@parallax.com

' {$STAMP BS2}

' {$PBASIC 2.5}

' -----[ Program Description ]---------------------------------------------

' This program demonstrates using a Hitachi-compatible Parallel LCD Display

' This code works with the BS2, BS2e and BS2sx

' -----[ I/O Definitions ]-------------------------------------------------

E PIN 0 ' Enable Pin For LCD

RW PIN 2 ' R/W Pin For LCD

RS PIN 3 ' LCD Register Select

' 0 = Instruction, 1 = Text

' -----[ Variables ]-------------------------------------------------------

char VAR Byte ' Character To Send To LCD

inst VAR char ' Induction To Send To LCD

index VAR Word ' Character Pointer

temp VAR Byte ' Temp Variable

' -----[ EEPROM Data ]-----------------------------------------------------

DATA "Hello, this is the LCD demo." ' Message To Send To LCD

' -----[ Initialization ]--------------------------------------------------

Initialize:

LOW RW ' Set LCD To Write Mode

OUTS = %0000000000000000 ' Set All Output Low

DIRS = %0000000011111111 ' Set I/O Direction

GOSUB Init_Lcd ' Initialize The LCD Display

' -----[ Program Code ]----------------------------------------------------

Main:

FOR temp = 0 TO 27 ' 28 Characters

IF temp = 15 THEN ' Check For End Of Line

GOSUB Next_Line ' Jump To Next Line

ENDIF

READ temp, char ' Read Next Character From EEPROM

GOSUB Send_Text ' Send Character To LCD Display

END

' -----[ Subroutines ]-----------------------------------------------------

Init_Lcd:

PAUSE 200

OUTS = %00110000 ' Reset The LCD

PULSOUT E,1 ' Send Command Three Times

PAUSE 10

PULSOUT E,1

PAUSE 10

PULSOUT E,1

PAUSE 10

OUTS = %00100000 ' Set To 4-bit Operation

PULSOUT E,1

Inst = %00101000 ' Function Set (2-Line Mode)

GOSUB Send_Inst

Inst = %00001110 ' Turn On Cursor

GOSUB Send_Inst

Inst = %00000110 ' Set Auto-Increment

GOSUB Send_Inst

Inst = %00000001 ' Clears LCD

GOSUB Send_Inst

Inst = 14 ' Set Cursor To Underline

GOSUB Send_Inst

RETURN

Send_Inst:

LOW RS ' Set Instruction Mode

OUTB = Inst.HIGHNIB ' Send High Nibble

PULSOUT E,1

OUTB = Inst.LOWNIB ' Send Low Nibble

PULSOUT E,1

HIGH RS ' Set LCD Back To Text Mode

RETURN

Send_Text:

OUTB = Char.HIGHNIB ' Send High Nibble

PULSOUT E,1

OUTB = char.LOWNIB ' Send Low Nibble

PULSOUT E,1

PAUSE 100

RETURN

Next_Line:

Inst = 128+64 ' Move Cursor To Line 2

GOSUB Send_Inst

RETURN

BASIC Stamp 2p24, 2p40 2pe and 2px24 code

' =========================================================================

' File...... Parallel_LCD_2X16.bsp

' Purpose... Parallel LCD Display Demo

' Author.... Parallax, Inc.

' E-mail.... support@parallax.com

' {$STAMP BS2p}

' {$PBASIC 2.5}

' -----[ Program Description ]---------------------------------------------

' This program demonstrates using a Hitachi-compatible Parallel LCD Display

' This code works with the BS2p24, BS2p40, BS2pe and BS2px24

' -----[ I/O Definitions ]-------------------------------------------------

Lcd PIN 0 ' LCD Enable Pin

' -----[ Variables ]-------------------------------------------------------

temp VAR Byte

char VAR Byte

' -----[ Initialization ]--------------------------------------------------

Init_Lcd:

PAUSE 1000

FOR temp = 0 TO 2

LCDCMD Lcd, 48 ' Reset LCD (Send 3 times)

PAUSE 5 ' Delay Require By LCD Specs

LCDCMD Lcd, 32 ' Set 4-bit Mode

LCDCMD Lcd, 40 ' Set 2-line Mode

LCDCMD Lcd, 12 ' Turn On Display With No Cursor

LCDCMD Lcd, 6 ' Set To Auto-Increment Cursor

LCDCMD Lcd, 1 ' Clear Display

' -----[ Main Routine ]----------------------------------------------------

Main:

LCDOUT Lcd, 1, ["Hello, this is"] ' Clear LCD & Print Line 1 Text

LCDOUT Lcd, 192, ["the LCD demo."] ' Move To Line 2 & Print Text

PAUSE 3000 ' Wait A Few Seconds

LCDCMD Lcd, 1 ' Clear LCD

PAUSE 500 ' Wait 1/2 Second

LOOP ' Do It Again

END

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