Notice: Any messages purporting to come from this site telling you that your password has expired, or that you need to "verify" your details, making threats, or asking for money, are
spam. We do not email users with any such messages. If you have lost your password you can obtain a new one by using the
password reset link.
Entire forum
➜ Electronics
➜ Microprocessors
➜ Connecting a graphical LCD via a I2C/SPI using a 16-bit port expander
Connecting a graphical LCD via a I2C/SPI using a 16-bit port expander
|
Postings by administrators only.
Refresh page
Pages: 1
2
Posted by
| Tristec
(1 post) Bio
|
Date
| Reply #15 on Sun 25 Mar 2012 09:44 AM (UTC) |
Message
| Hey Nick,
I have the same situation like moe: I cant see anything on screen, but the backlight with the poti is working.
I checked the connections several times but without solving the problem. Your I2C scanner printed "Found address: 32 (0x20)".
My LCD is labeled with "RT12864J-1" - the datasheet can be found here: http://www.satistronics.com/myfiles/file/LCD/RT12864J-1.pdf
Do you have an idea how to fix this problem, I would be very happy ;-) | Top |
|
Posted by
| Nick Gammon
Australia (23,070 posts) Bio
Forum Administrator |
Date
| Reply #16 on Mon 26 Mar 2012 03:36 AM (UTC) |
Message
| Without the hardware in front of me it's hard to say. Could be a timing issue. I would be measuring the data lines to make sure that they are clocking out what I expect to see. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | Top |
|
Posted by
| Moe69
(7 posts) Bio
|
Date
| Reply #17 on Mon 26 Mar 2012 07:34 PM (UTC) |
Message
| hi there,
i bought a new expander chip, because i thought it was broken. but i got the same problems. theres nothing on screen, only white pixels with full contrast.
how can i change the timing of the output pins?
---moe | Top |
|
Posted by
| Nick Gammon
Australia (23,070 posts) Bio
Forum Administrator |
Date
| Reply #18 on Mon 26 Mar 2012 07:47 PM (UTC) |
Message
| I would be surprised if the chip was broken, I don't usually have problems with them.
You could try directly connecting the LCD to the processor, leaving the expander out for now, just to check the LCD is OK.
I think I had problems a while back with the backlight control. If it isn't right the characters can be impossible to see.
As for the timing, a brief delay between sending stuff might be required or it might arrive too fast for the LCD to store it. |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | Top |
|
Posted by
| Nick Gammon
Australia (23,070 posts) Bio
Forum Administrator |
Date
| Reply #19 on Tue 27 Mar 2012 04:54 AM (UTC) |
Message
| You are probably best off going to the Arduino forum:
http://arduino.cc/forum
... and ask there. There may be someone there who can say "ah I used LCD X and this is how I got it to work". |
- Nick Gammon
www.gammon.com.au, www.mushclient.com | Top |
|
Posted by
| Ijohnson
USA (1 post) Bio
|
Date
| Reply #20 on Wed 13 Jun 2012 05:09 PM (UTC) |
Message
| I have an HJ19264A 192x64 GLCD. I am trying to adapt this LCD to your libraries. It adds a third KS0108 chip. To "chip select" the proper chip, you must do as follows:
chip / pin CS0 CS1 CS2
chip 0 LOW HIGH HIGH
chip 1 HIGH LOW HIGH
chip 2 HIGH HIGH LOW
How can I implement this using your library?
Thanks! | Top |
|
The dates and times for posts above are shown in Universal Co-ordinated Time (UTC).
To show them in your local time you can join the forum, and then set the 'time correction' field in your profile to the number of hours difference between your location and UTC time.
225,367 views.
This is page 2, subject is 2 pages long:
1
2
Postings by administrators only.
Refresh page
top