Re: [avr-chat] LCD corruption

[Royce Pereira]

Hello,

On Wed, 28 Sep 2005 00:13:46 +0530, Andy Warner <address@hidden> wrote:

> Royce Pereira wrote:
> > Hi all,
> > I have a m8535 board which drives a relay card. Now there are some  
> > 220VAC
> > solenoid valves switched by the relays.
> >
> > My problem is that when the valves are connected, the LCD gets corrupted
> > when the valves switch on.
> > [...]
>
> What kind of LCD display is it ?

It's a 16x2 garden variety Alphanumeric LCD(large characters)

> How is it connected to the 8535 ?

It is connected directly to the port pins of the 8535. No cable is used.  
The 8535 is on the component side, while the LCD is pressed into a SIP  
socket on the solder side & screwed down too.
The CPU supply & LCD supply are the same.
> If this is on a PCB - can you post a jpg/pdf of the board layout ?

It's a double sided plated thru PCB. So I'll have to send 3 files(top,  
bottom, & silkscreen) for anyone to follow what's happening. If you are  
inclined, I could still send it to you.

Thanks,
--Royce.

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