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➜ Electronics
➜ Microprocessors
➜ Connecting a graphical LCD via a I2C/SPI using a 16-bit port expander
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Connecting a graphical LCD via a I2C/SPI using a 16-bit port expander
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| 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 |
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| 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 |
|
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