Blinking my very first led, LCD ? - Electronic Circuits Projects Diagrams Free

joshua17ss2 · 7th May 2008, 03:12 PM

I recieved my new pickit2 in the mail the other day and hooked it up to my protoboard, and was able to blink my very first led with the Pic 18f2550, There really is quite a sense of accomplishment in that small task

Now im gonna shoot for displaying text on an lcd and accepting inputs from buttons,

I was wondering, i have a 4x16 lcd display, i know that 2x16 displays get connected up with 4 wires for the data and a few other for CLS, R/S, E, ect...
is there a different connection setting for a 4 x 16, does it require more wires or does the lcd driver handel that aspect of it?

thanks
josh

futz · 7th May 2008, 03:18 PM

Quote:

Originally Posted by joshua17ss2

is there a different connection setting for a 4 x 16, does it require more wires or does the lcd driver handel that aspect of it?

Same connections. They pretty much all use the same driver chip, and internally are the same display. The different display widths and number of lines are just "windows" onto the actual display, which is the same size in all 44780 driven LCDs. Just imagine you're looking thru a small window onto a larger display. You can only see what's under the window at any given time, but you can move the window to see the rest with the right commands. Or you can just tell the LCD to print stuff in the part of the display that's under the window.

Confused yet? You will be! But then it'll make sense.

joshua17ss2 · 7th May 2008, 03:25 PM

So the only change between the small lcd and the larger a line in the code right, WriteAt(1,1,"Test") so i would just change the 1,1 to what ever space i need to write at?

futz · 7th May 2008, 03:36 PM

Quote:

Originally Posted by joshua17ss2

So the only change between the small lcd and the larger a line in the code right, WriteAt(1,1,"Test") so i would just change the 1,1 to what ever space i need to write at?

Line 1 and line 2 (I think) always start at the same address, so if you want to print to line 1 you tell it to go to that address and print away. If you exceed the width of the display it prints into undisplayed memory. Once you exceed the undisplayed width of line 1 (40 characters? - can't remember) then the text will show up in line 2.

For an excellent guide, get these two PDFs from EPE:
http://www.epemag.wimborne.co.uk/lcd1.pdf
http://www.epemag.wimborne.co.uk/lcd2.pdf
They're a must-read if you're learning LCDs.

donniedj · 8th May 2008, 04:59 AM

Quote:

Originally Posted by futz

For an excellent guide, get these two PDFs from EPE:
http://www.epemag.wimborne.co.uk/lcd1.pdf
http://www.epemag.wimborne.co.uk/lcd2.pdf
They're a must-read if you're learning LCDs.

Forum admin should force those links under every signature whether it be wanted or not. Just to emphasize the truth of "They're a must-read..."

Let me log out know before I piss to many people off.. again

7th May 2008, 03:12 PM	(permalink)
joshua17ss2 Experienced Member	Blinking my very first led, LCD ? I recieved my new pickit2 in the mail the other day and hooked it up to my protoboard, and was able to blink my very first led with the Pic 18f2550, There really is quite a sense of accomplishment in that small task Now im gonna shoot for displaying text on an lcd and accepting inputs from buttons, I was wondering, i have a 4x16 lcd display, i know that 2x16 displays get connected up with 4 wires for the data and a few other for CLS, R/S, E, ect... is there a different connection setting for a 4 x 16, does it require more wires or does the lcd driver handel that aspect of it? thanks josh

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7th May 2008, 03:25 PM	(permalink)
joshua17ss2 Experienced Member	So the only change between the small lcd and the larger a line in the code right, WriteAt(1,1,"Test") so i would just change the 1,1 to what ever space i need to write at?