turning a parallel interface lcd into a serial interface?

Using Arduino Displays
1

Hello,

I heard that serial lcd are just parallel ones with serial daughterboards attached. I have a parallel interface lcd that I want to use but I don't know how to change it over to serial or program in parallel. anybody have any help?

Thanks in advance!

2

what kind of lcd?
If it is a hd44780, there are some easy to implement shift register implementations with libraries available.

There are also some ready-made backpacks that can convert the hd44780 interface to
a shift register, i2c, or async serial.

Is the goal to reduce the pins or to off load the processing to an intelligent "backpack"?

--- bill

3
4

It's hard to say from that datasheet as it is a bit terse.
It doesn't look like it has a MPU data/command style interface.
It looks like it has a very low level signal/pixel clocking type interface
the kind that is normally paired with some sort of driver chip and a bit of RAM
on a controller module.

I'm not sure if you will be able to directly use that type of interface with an Arduino.

--- bill

5

mmkay, thats what I was afraid of. Thanks though!

Do you know of a screen that is the same size but able to interface with?

6

http://iteadstudio.com/store/index.php?main_page=product_info&cPath=57_58&products_id=54

7

Wow! that sounds great!

They mentioned two versions of it. Just to clarify, the one you linked IS the one with the touch capability, correct?

8

akafugu have a couple of I2C-interface backpacks you can fit to parallel-interface HD44780 modules
Akafugu Corporation or adafruit
i2c / SPI character LCD backpack - STEMMA QT / Qwiic : ID 292 : $9.95 : Adafruit Industries, Unique & fun DIY electronics and kits
I like the akafugu ones as they can control the brightness and contrast in software. If you're looking to learn how to program it in parallel, check out LiquidCrystal - Arduino Reference and http://tronixstuff.wordpress.com/2011/01/08/tutorial-arduino-and-monochrome-lcds/
have fun

9

hey those packbacks look great.

I was looking for one to more so go with a graphic LCD so I could overlay a touchscreen on top of it to get some sweet stuff goin.

10

Hi
I think the iteadstudio graphics color LCD has a touch screen, at least as an ordering option. Another question is, what is the intended frame rate for the display. With a full color LCD, graphics rendering is slow. Monochrom LCDs are much easier to handle for the Arduino.

For example, almost all the monochrome LCDs from http://www.lcd-module.com/products/dog.html can be equiped with touchscreens.

Oliver

11

I don't think it'll be an issue with render as all ill be doing is rotating a very simple graphic.

Monochrome lcds are too pixily for this.