How to make an LCD serial interface

hi friends
i am using a 16x 2 lcd having parallel interface .i want to make it serial interfaced. what to do? serial lcd are not available in my area. can i use some parallel to serail converter chips

bye

lcd parallel to serial interface

Just a 2 cents idea: Use a CPLD to convert your serial stream to parallel.
As an example a simple EP3064 from Altera would do the Job.
Aantage:
- A CPLD could have a state machine which would initiate your LCD at startup.

- It would take care of the low level handling.

- If you change the LCD in the future, you won't have to modify your host software but only the CPLD

- Free the host from repetitive low level handling.

In short create an 'intelligent' LCD controller.

make serial interface for lcd

Hi kiranswaps,

henrik2000's idea is pretty good, I have a few other idea's....

I've recently done the same thing with a typical hitachi 2x16 module, although I used SPI. It simply used a HEF4094 shift register, and the SSP port of my PIC micro. Only uses 3 I/O's, and a bit of code. If you want the code, I'll be glad to post it, its a bit shoddy, but it works for me.

But, I'm sure you're after standard UART type serial, start, byte, stop type scenario. Theres a fair bit of info on the net for folks who wanna add this LCD to thier PC without using their parallel port, theres a circuit that interfaces to rs232 comm port, which I guess is what you need (true rs232 requires the MAX232 to get the levels right, if you're using serial from a microcontroller, just omit this). I'll see if I can find it. It uses a UART chip, which frankly is a bit big, and the communication is only oneway, so half the IC isn't needed, probably overkill. Thats where Henriks idea comes through, just configure a CPLD as the recive part of the UART (pretty simple).

Another option is to use a slave PIC micro. I'm in the middle of desinging one, you put your serial/SPI/I2C in, and it controls all the functions of the LCD. However, its a bit of a hassle if you consider it a waste of one of your precious micro's. Thankfully this guy http://www.rentron.com/Products/Serial_LCD_Backpack.htm has built one for you, called the 'LCD backpack'. its ready made, and you just plug in your LCD and serial connector.

Hope this helps. Good Luck.

BuriedCode.

Some other stuff I found:
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The last website is truely inspiring, one of my fav's.

Re: lcd serial interface

Thank you Buriedcode for your input.

In my mind the serail uart is part of the cpld. So it's a one chip solution (exept if RS232 is required, as you mentionned very justly, then a 232 transmitter is required.)

lcd serial interface

Have a look here , it could give some hints

**broken link removed**

That should be easy to adapt to a HD44xxx LCD chip.

That it is a VFD has no influence on the converter.

/Bingo

lcd serial interface

see in book : Experimenting with the PicBasic Pro Compiler by: Les Johnson

Section - 1 : Simple serial LCD controller
Code by PICB@SIC PRO

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http://www.micro4you.com