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I2C/RS232 to Standard LCD Converter

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Description

This small board allows to connect a standard 1 line or 2 line LCD-Module (with HD44780 LCD-Controller or compatible) to I2C bus or optional to RS232.

Here is the schematic (Rev. 1) in pdf format

Assembly drawing (Rev. 1) in pdf TOP
Assembly drawing (Rev. 1) in pdf BOTTOM

Pictures of the board:

Interface description

I2C_LCD Dokumentation
---------------------

For LCD Display 2* 16 Characters, Hd44780 compatible

Almost SW-compatible to EA7123-I2C

Maximum I2C-speed: 50KHz

I2C Address: 0x74

Initialisatzion: 74 00 2C 0E 06 01

Write pointer to line 1 position 0 : 74 00 02

Write data to display : 74 40 <20 characters>

Data stream :
------------
line 1 : char 00,01,02,03,04,05,06,07,08,09,10,11,12,13,14,15,d01,d02,d03,d04,d05,
line 2 : char 16,17,18,19,20,21,22,23,24,26,26,27,28,29,30,31,d06,d07,d08,d09,d10,
line 3 : char d11,d12,d13,d14,d15,d16,d17,d18,d19,d20,d21,d22,d23,d24,d25,d26,d27

( dxx is dummy character for compatibility, will not be displayed,
line 3 is dummy line for compatibility, line 3 will never be displayed)

LCD-Character Position:
-----------------------
P32=0;
line 1 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15
line 2 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31

P32=1;
line 1 .. .. 00 01 02 03 04 05 06 07 08 09 10 11 .. ..
line 2 .. .. 16 17 18 19 20 21 22 23 24 25 26 27 .. ..

Partlist

Just take a good look at the pictures ;-)

Files

Posted by Jospfh at Oct 19 2006 19:16

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