The Cyber-Spy.Com Usenet Archive Feeds Directly
From The Open And Publicly Available Newsgroup
This Group And Thousands Of Others Are Available
On Most IS NNTP News Servers On Port 119.
Cyber-Spy.Com Is NOT Responsible For Any Topic,
Opinions Or Content Posted To This Or Any Other
Newsgroup. This Web Archive Of The Newsgroup And
Posts Are For Informational Purposes Only.
X-Mailer: Mozilla 4.75 [en] (Win98; U)
Subject: Re: PIC Digital Volume Controller
Organization: Chariot Internet - http://www.chariot.net.au
Date: Fri, 01 Nov 2002 18:57:21 +1030
NNTP-Posting-Date: Fri, 01 Nov 2002 19:30:31 EST
All the LCD graphics panels that I have used have a negative contrast
supply. I use the MAXIM MAX686EEE device to achieve this. It outputs a
positive or negative voltage up to 29.7V that is controlled by UP/DOWN
input pins. It also has a shutdown pin. MAXIM have several similar chips
that solve the pos/neg contrast voltage issue simply and slightly
cheaper than this part, but I use this in several other places anyway.
Ian Sheevan wrote:
> I am currently working on the project
> "PIC Graphics LCD Scope"
> available here:
> I plan to control the LCD contrast
> using a digital pot [Similar to digital
> volume push-button] rather than the
> Is it possible to control the LCD contrast
> using the PIC16f877 rather than using ready
> made IC's from MAXIM [Dallas Semiconductor]?
> If not possible, Is there a circuit that
> functions like a potentiometer without
> using Maxim IC's?
> All suggestions appreciated.
Go Back To The Cyber-Spy.Com
Usenet Web Archive Index Of
The sci.electronics.design Newsgroup