805-00012 datasheet, PDF - EEWORLD Datasheet

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805-00012: DescriptionSpecialized Cables EXTENSION CABLE; CategoryWire/cable; File Size125KB，11 Pages; ManufacturerParallax

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805-00012 Overview

Specialized Cables EXTENSION CABLE

805-00012 Parametric

Parameter Name	Attribute value
Product Attribute	Attribute Value
Manufacturer	Parallax
Product Category	Specialized Cables
Factory Pack Quantity	1
Unit Weight	0.150400 oz

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Web Site: www.parallax.com

Forums: forums.parallax.com

Sales: sales@parallax.com

Technical: support@parallax.com

Office: (916) 624-8333

Fax: (916) 624-8003

Sales: (888) 512-1024

Tech Support: (888) 997-8267

Parallax Serial LCD

2 rows x 16 characters, Non-backlit, with Piezospeaker (#27976)

2 rows x 16 characters, Backlit, with Piezospeaker (#27977)

4 rows x 20 characters, Backlit, with Piezospeaker (#27979)

The Parallax Serial LCDs are very functional, low-cost liquid crystal displays that can be easily interfaced

to and controlled by a microcontroller using a I/O pin. The LCD displays provide basic text wrapping so

that your text looks correct on the display. Full control over all of their advanced LCD features allows you

to move the cursor anywhere on the display with a single instruction and turn the display on and off in

any configuration. They support visible ASCII characters Dec 32-127, and in addition you may define up

to eight of your own custom characters to display anywhere on the LCD.

NOTE: If your Serial LCD Display does not have a speaker on the back, use the specifications

and information in the Product Change Notice: Revision E and Earlier section on page 11.

Features



Clear 40-pixel characters (8 H x 5 W)



Supports ASCII DEC characters 32-127



Define up to eight custom characters



Automatic text wrapping



Single command cursor placement



Single command clears the display



Define up to eight custom characters



Select 2400, 9600, or 19,200 baud with switches on

the back of the device



Display type: STN, YG, positive transflective LCD

Adjustable contrast knob on the back of the device

YG LED for backlit model displays

Key Specifications



Power requirements:

Non-backlit: +5 VDC, 20 mA

Backlit: +5 VDC, 20 mA (light off), ~ 80 mA typical (light on)



Communication: Selectable asynchronous serial baud rates: 2400, 9600, 19200

Operating temperature: -4 to +158 °F (-20 to +70°C)

Dimensions: NOTE - Board and LCD size and style may vary

2x16: Approx. 1.42 x 3.15 in (36 x 80 mm)

4x20: Approx. 2.37 x 3.86 in (60.2 x 98.1 mm)

Parallax Serial LCDs (#27976, 27977, 27979)

v3.1 3/11/2013 Page 1 of 11

Displaying Text

Now that the LCD is set up, it’s time to start sending text to the display. To display a character of text on

the Serial LCD, simply send the ASCII code of that character to the Serial LCD over the serial port at the

correct baud rate.

When a character is received, the Serial LCD displays that character at the current cursor position and

then moves the cursor one position to the right. When you first turn on the LCD, the cursor is in the

leftmost position on the top line, as you might expect. The short bar on the bottom of the character

shows where the cursor is positioned currently.

Once you’ve sent a full line characters to the LCD, you will notice that the cursor automatically wraps

around to the leftmost position of the second line, just like the text in a book. The text will wrap like this

at the end of every line, with the end of the bottom line wrapping back around to the top line of the LCD.

The text will never “run off” the display; you’ll always see all of the characters you send.

Example code is provided below. You may download the example code files from the 27976, 27977, or

27979 product pages at www.parallax.com; just enter any of these product numbers in the “search” field

on the home page

BASIC Stamp

2 Example Code

You may download the example code from the 27976, 27977, or 27979 product pages at

www.parallax.com; just enter any of these product numbers in the “search” field on the home page. Try

the following code on your BASIC Stamp 2 to send a text string to the LCD display. First, set the baud

rate on your Serial LCD to 19,200. Then, load the code below into your BASIC Stamp 2 and run it.

You will see the text string show up and wrap to the second line of the display.

In all of your Serial LCD code, you should pause for 100 ms at start-up to give time for the Serial LCD to

initialize. You should also set the serial port pin on the BASIC Stamp to HIGH before the 100 ms start-up

delay, as this is the normal state of a serial port when it isn’t sending any data.

' {$STAMP BS2}

' {$PBASIC 2.5}

TxPin

Baud19200

HIGH TxPin

PAUSE 100

CON

' Set pin high to be a serial port

' Pause for Serial LCD to initialize

SEROUT TxPin, Baud19200, ["Hello, this text will wrap."]

Propeller P8X32A Example Code

Try the following code on your Propeller to send a text string to the LCD display. First, set the baud rate

on your Serial LCD to 19,200. Then, load the code below into your Propeller and load RAM or EEPROM.

You will see the text string show up and wrap to the second line of the display.

In all of your Serial LCD code, you should wait for 100 ms after starting the FullDuplexSerial.spin object,

to give the object and the Serial LCD time to initialize. The FullDuplexSerial.spin object is included with

the Propeller Tool.

Parallax Serial LCDs (#27976, 27977, 27979)

v3.1 3/11/2013 Page 3 of 11

{{

Serial_LCD_Demo.spin

For Parallax Serial LCDs 27976, 27977, 27979

}}

CON

_clkmode = xtal1 + pll16x

_xinfreq = 5_000_000

TX_PIN = 0

BAUD = 19_200

OBJ

LCD : "FullDuplexSerial.spin"

PUB Main

LCD.start(TX_PIN, TX_PIN, %1000, 19_200)

waitcnt(clkfreq / 100 + cnt)

' Pause for FullDuplexSerial.spin to initialize

LCD.str(string("Hello, this text will wrap."))

Moving the Cursor

When you send a character to the Serial LCD, it always displays at the current cursor position. There are

a few different ways to move the cursor on the Serial LCD display. After each character you send, the

cursor automatically moves over one position. Along with this, there is a standard set of cursor move

commands including Backspace, Carriage Return, and Line Feed.

The Backspace/Left command (Dec 8) moves the cursor one place to the left and the Right command

(Dec 9) moves the cursor one place to the right. These can be useful for moving the cursor around to

overwrite existing text. These commands wrap to the next line of the display, if necessary. The Line Feed

command (Dec 10) moves the cursor to the next line of the display without changing the horizontal

position of the cursor. The Carriage Return command (Dec 13) also moves the cursor to the next line, but

it moves the cursor to the leftmost position on that line as well. The Form Feed command (Dec 12) clears

the entire display and moves the cursor to the leftmost position on line 0, just like when you first turn on

the display. You will need to pause for 5mS in your code after sending the Form Feed command, to give

the Serial LCD time to clear the display. Except for Form Feed, none of these move commands affects the

characters on the display.

There are also direct move commands that you can use to move the cursor to any position on the display

with a single command. The commands in the range Dec 128 to 143 and Dec 148 to 163 move the cursor

to the 16 different positions on each of the two lines of the model 27976 and 27977 LCDs. The

commands in the range Dec 128 to 207 move the cursor to the 20 different positions on each of the four

lines of the model 27979 LCD.

Controlling the Display

You also have control over the various display modes of the Serial LCD. The display-off command (Dec

21) turns off the display so that all of the characters disappear. The characters aren’t erased from the

display, though, and you can even keep writing new characters to the display when it is turned off. A

trick to make a lot of text show up all at once, even at a slow baud rate, is to turn off the display and

then send all of your text. Then, when you turn the display on again, all of the text appears instantly.

Parallax Serial LCDs (#27976, 27977, 27979)

v3.1 3/11/2013 Page 4 of 11

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