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Controlling RA6963 240x128 LCD with pic 16f877a

 
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ToperaGarimpero



Joined: 29 Apr 2022
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Controlling RA6963 240x128 LCD with pic 16f877a
PostPosted: Fri Apr 29, 2022 11:53 am     Reply with quote

Hello, I have been trying to make a Chinese lcd module to work, but so far, not even the contrast is working.

I'm using the code and libraries from this old post:

http://www.ccsinfo.com/forum/viewtopic.php?t=49389&highlight=t6963

And the lcd's pinout is in this chart.

https://imgur.com/a/PqYW1HW

One issue that I've found is that there's no negative voltage on Vee, and using an external power supply doesn't seem to make the contrast potentiometer to work.
Does anyone know what I could've been doing wrong?
PCM programmer



Joined: 06 Sep 2003
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PostPosted: Fri Apr 29, 2022 1:56 pm     Reply with quote

Post a link to the data sheet for the LCD. Or the website for it.
temtronic



Joined: 01 Jul 2010
Posts: 8525
Location: Greensville,Ontario

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PostPosted: Fri Apr 29, 2022 2:46 pm     Reply with quote

YES, need to KNOW what LCD module it is.. !!
Is it JUST the actual chip or a premade PCB with LCD,controller and 'connections' ??
I downloaded a manual Vee is mentioned as YOu supply it.


No Vee ? maybe YOU have to supply it ??

Some modules actually have the VEE electronics onboard...some don't....
Ttelmah



Joined: 11 Mar 2010
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PostPosted: Sat Apr 30, 2022 5:18 am     Reply with quote

Yes.
We need to know what the module actually 'is'.
The voltage needed for Vee, depends of the display technology involved.
I have seen units needing voltages between -10v, and +4v. In many
cases different colour versons of the same display will need massively
different voltages on this.
We can't actually help you unless you tell us the unit involved.
temtronic



Joined: 01 Jul 2010
Posts: 8525
Location: Greensville,Ontario

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PostPosted: Sat Apr 30, 2022 7:50 am     Reply with quote

I had one that spec said it needed -19 volts. I 'borrowed' some electrons from the -15 for the op amps in that project..... Very Happy

The other possible problem is that's a 5 volt PIC, so IS the LCD module a true 5 volt device or really 3 volt Vdd with 5 v 'tolerant' I/O pins ??
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