how to make 12 pin LCD work // HD44780A00 HD66100F

Other Hardware Displays
1

Hello,

I have a LCD display which has two chips

5C2 HD44780A00
5B1 HD66100F

I had wired it with the instructions on this link.

However, I couldn't make it work.

Actually in the tutorial there are 14 pins, but I have 12. I guess it is because I don't have back-lights.

Am I doing something wrong, or this display doesn't work? How can I test it. I couldn't even turn it on.

Later on, I saw this lines on the board.

C087003A REV A
HCN-24V
JAPAN

So is it working with 24V. Is that the reason?

2

I have a LCD display which has two chips ...

The HD44780 and HD66100 are the correct chips for a display that is compatible with the LiquidCrystal library so you are OK so far.

Actually in the tutorial there are 14 pins, but I have 12. I guess it is because I don't have back-lights.

Count them again. The display in the tutorial has 16 pins, two of which are for the backlight. Are you sure that your display doesn't have 14 pins?

If it indeed has only 12 pins then we will need a picture of each side and/or a link to a datasheet.

How did you wire it and what did it do when it "didn't work"?

Don

3

Hi floresta,

I wrote wrong. Sorry. Probably because of being tired.

There are 14 pins. I don't have any datasheet. I got it from an old part store. When I wired, there was no change on the screen. Actually I forgot to say that. I tried to make it work with +5V coming from Arduino. Do you think it is working with 24V? Is that the reason I didn't see any changes on the screen?

Thank you

4

There are 14 pins. I don't have any datasheet. I got it from an old part store. When I wired, there was no change on the screen. Actually I forgot to say that. I tried to make it work with +5V coming from Arduino. Do you think it is working with 24V? Is that the reason I didn't see any changes on the screen?

I seriously doubt that it is designed to work with a 24V supply. Unless it is quite unusual a display based on the HD44780 should work with the tutorial that you are using -- if you do everything correctly. In order to check your work we are going to need more information.

Don