Newhaven 4x40 LCD, issues!

[MOUNTAIN747]

I have a display now. After making some fine adjustments to Vo, characters are writing as they should. Using both LCDOUT and hammering out the commands as in the code above. More to come!

[Darrel Taylor]

A 4x40 is really two 2x40's.
And it can be handled this way ... http://www.picbasic.co.uk/forum/show...=2388#post2388

[MOUNTAIN747]

Thanks for the link Darrel, I'll check this out. It looks like it will solve my problem.

Thanks again!
Wayne

[Christopher4187]

Talk about timing. I just received two Newhaven OLED 4x20 LCD's in the mail today (http://www.newhavendisplay.com/specs...420DZW-AY5.pdf). A couple of questions:

I am putting this on a Microchip demo board (MCP2515) and I can't use all of Port B. Can I use any 8 pins that are free? Also, what is 4 bit operation and is it worthwhile to use it? The datasheet says that 4 lines aren't used when it's in 4 bit operation so I'm curious of using 4 less pins would be advantageous without losing any clarity on the LCD screen.

Sorry to hi-jack the thread but it seems appropriate in this case.

[mackrackit]

http://www.picbasic.co.uk/forum/show...ght=lcd+anypin

[Christopher4187]

http://www.picbasic.co.uk/forum/show...ght=lcd+anypin

Thanks for the link. Regarding my other question, is there any great benefits to using 8 bit (clarity/speed) or will 4 bit do the job? If 4 bit will do the job, just so I understand correctly, I need 7 pins from the PIC:

1. RS
2. R/W
3. E
4. Low order, bi-directional (1)
5. Low order, bi-directional (2)
6. Low order, bi-directional (3)
7. Low order, bi-directional (4)


Am I on the right track?

[mackrackit]

R/W goes to VSS.

8 bit is a tad faster by the math but I do not think it is humanly noticeable. I never use 8 bit as pins get ...expensive...