Re: HD44780-based LCD Modules


Jun 28, 2003

 


----------------------------

#1625 Jun 28, 2003

Hey guys.

I building my own serial LCD controller and I ran into a problem.

When I try to lower the LCD WR pin to 0 (Logic 0 = write) the PIC

(628) resets. Is this a power issue ? I don't know what to look for.

I tried connecting the WR directly to ground, but then the PIC won't

start running although there is power on the right pins, there is

no short I can find.

I'm using these schematics :

academic1.bellevue.edu/robots/16f84lcd.jpg

Any ideas ?



Thanks,

Shachar Weis.



----------------------------

#1627 Jun 28, 2003

What happens when you execute the code without the LCD connected? It

certainly sounds like you are trying to short out the power supply.

--- In piclist@yahoogroups.com, "holopoint.rm" holopoint@r...> wrote:

> Hey guys.

> I building my own serial LCD controller and I ran into a problem.

> When I try to lower the LCD WR pin to 0 (Logic 0 = write) the PIC

> (628) resets. Is this a power issue ? I don't know what to look for.

> I tried connecting the WR directly to ground, but then the PIC won't

> start running although there is power on the right pins, there is

> no short I can find.

> I'm using these schematics :

> academic1.bellevue.edu/robots/16f84lcd.jpg

> Any ideas ?

>

> Thanks,

> Shachar Weis.



----------------------------

#1635 Jun 28, 2003

What happens when you execute the code without the LCD connected?

It > certainly sounds like you are trying to short out the power supply.



Without the LCD the code runs OK.

When I connect the RW pin to ground there is still a nice clean 5v on

the pic power pins, I don't understand why It's not running.

Weirdo. I'm going to try a different LCD.

Thanks,

Shachar.


S
e
n
i
o
r
T
u
b
e
.
o
r
g