This is the Revision A version of the LCD32 module.

LCD32 Module (Revision A)

Table of Contents

This document is also available in PDF format.

• 1. Introduction
• 2. Programming
• 3. Hardware
  • 3.1 Circuit Schematic
  • 3.2 Printed Circuit Board
• 4. Software
• 5. Issues

1. Introduction

The LCD32 module can display a total 4 lines of 16 characters each, of which only 2 lines are visible at a time. The characters are displayed using a 5×7 dot matrix. There is a mechancal switch labeled LINES on the LCD32 module that switches between displaying lines 1-2 and lines 3-4. The LCD32 module is based upon the inexpensive Lumex^® LCM-S01602DTR/M 2×16 liquid crystal display (LCD) module available from both Digikey^® and Mouser^®. The LCD32 module has a small trim potentiometer that allows you adjust the display contrast.

2. Programming

Command	Send/ Receive	Byte Value									Discussion
		8	7	6	5	4	3	2	1	0
Back Space	Send	0	0	0	0	0	1	0	0	0	Move cursor to the left.
Line Feed	Send	0	0	0	0	0	1	0	1	0	Advance currsor to beginning of next line; clear the next line
Form Feed	Send	0	0	0	0	0	1	1	0	0	Clear entire display and place cursor at home
Carriage Return	Send	0	0	0	0	0	1	1	0	1	Return cursor to beginning of line
Character 32 to 63	Send	0	0	0	1	x	x	x	x	x	Enter the character on the display and advance cursor.
Character 64 to 127	Send	0	0	1	x	x	x	x	x	x	Enter the character on the display and advance cursor.
Line Set	Send	0	1	0	0	0	0	0	l	l	Move cursor to line ll
Line Clear	Send	0	1	0	0	0	0	1	l	l	Move cursor to line ll and clear it
Cursor Mode Set	Send	0	1	0	0	0	1	0	v	b	Cursor mode is set (v=1 visible cursor) (b=1 blinking cursor)
Cursor Mode Read	Send	0	1	0	0	0	1	1	0	0	Read cursor mode (v=1 visible cursor) (b=1 blinking cursor)
	Receive	0	0	0	0	0	0	0	v	b
Character Read	Send	0	1	0	0	0	1	1	0	1	Read the current character ccc cccc; advance cursor
	Receive	0	0	c	c	c	c	c	c	c
Line Read	Send	0	1	0	0	0	1	1	1	0	Read the current line ll
	Receive	0	0	0	0	0	0	0	l	l
Position Read	Send	0	1	0	0	0	1	1	1	1	Read the current character position pppp
	Receive	0	0	0	0	0	p	p	p	p
Position Set	Send	0	1	0	0	1	p	p	p	p	Move cursor to character position pppp
Position Set and Clear	Send	0	1	0	1	0	p	p	p	p	Move cursor to character position pppp; clear to end of line
Shared Commands	Send	0	1	1	1	1	1	c	c	c	Execute common command ccc.

3. Hardware

The hardware consists of a circuit schematic and a printed circuit board.

3.1 Circuit Schematic

The schematic for the LCD32 RoboBrick is shown below:

The parts list kept in a separate file -- lcd32.ptl.

3.2 Printed Circuit Board

The printed circuit board files are listed below:

lcd32_back.png

The solder side layer.

lcd32_front.png

The component side layer.

lcd32_artwork.png

The artwork layer.

lcd32.gbl

The RS-272X "Gerber" back (solder side) layer.

lcd32.gtl

The RS-272X "Gerber" top (component side) layer.

lcd32.gal

The RS-272X "Gerber" artwork layer.

lcd32.drl

The "Excellon" NC drill file.

lcd32.tol

The "Excellon" tool rack file.

4. Software

The LCD32 software is available as one of:

lcd32.ucl

The µCL source file.

lcd32.asm

The resulting human readable PIC assembly file.

lcd32.lst

The resulting human readable PIC listing file.

lcd32.hex

The resulting Intel^® Hex file.

5. Issues

The following fabrication issues came up:

• The Lumex LCD panel has extremely non-standard pin-numberings 14-1,16,15 rather than 1-16. Anyhow, the whole LCD panel is inproperly wired up.