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Graphic LCD tutorials?

hgboy

New member
I just purchased a CFAG12864F display, and need some info on how to interface it with a pic18f4550 microcontroller. I have never used a microcontroller to drive a display, so just reading the datasheet is a little bit overwhelming. Can anyone offer any advice or links to tutorials on the subject?
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CF Support2

Administrator
One place to start is in this thread:

https://forum.crystalfontz.com/showthread.php?t=3257

It is geared toward using a parallel port, but the concept is basically the same. You'll need to make sure you have the data and control lines configured. I did a quick search and found several other resources that should get you up and running:

http://www.melabs.com/products/books/mabook.htm

http://www.rentron.com/pic.htm

http://www.nabble.com/MicroControllers---PIC-f2059.html

http://www.robotbuilder.co.uk/Resources/Articles/146.aspx

Another good source is our user base here on the forums -- I am sure that there will be several other posts with more, and likely better information for you.
 

hgboy

New member
Ok, after searching around osme more, I think a little of this information is starting to make sense. There are 8 data lines, five control lines, power, ground and negative voltage for contrast. Which pins are for the operation of the backlight, and can I use a pot to adjust the brightness on this?
 

CF Support2

Administrator
All of our CFAG12864F series modules have on-board negative voltage and temperature compensation for the contrast. The suggested contrast control is a 10K pot. across Vdd (+5v source) and Vee (negative V out) with the wiper going to Vo (contrast).

For the backlight, you have a couple of options.

There are A (anode) and K (cathode) connectors on the module that will allow you to power the backlight separately. Or, if you choose, you can power the backlight from Pins 1 and 2. To do this, you will need to close Jumper J1 to connect the cathode to Vss / Pin 1 / Ground, and load a current limiting resistor in RA to connect the anode to Vdd / Pin 2 / +5v.

To calculate the value of RA:

(Vdd - Forward voltage) / Iled (use typical values.

So, for example, the CFAG12864F-YYH-TZ would work out to:

5 - 4.2 / .330 = 2.42 Ohms.

If you want to, you can use a pot directly in line with the anode to adjust the backlight. You will want to be careful and ensure that you do not exceed the backlight's maximum current.
 

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hgboy

New member
thanks for the info. I believe I have it all wired up correctly, now to write some code for the thing.
 
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