ScrewedUp

Archiver

Just started, Connected P0 to the +5V·rail when trying to setup an LCD display. Have I fried the BST2 or the LCD. Any commets welcome, be nice I am not·well diversed in electronics. Just having fun by purchasing·a StampWorks kit from Parallax and made it to Experiment #11: A basic LCD Demonstratiion. Quote unQuote after loading the code nothing visualy hapened and then I realized (after checking), I had connected the LCD·"E" pin at the junction of·a 4.7K resitor·ground wire to the +5V rail. The schematics:

P4 --- D4
P5 --- D5
P6 --- D6
P7 --- D7

P0 --- * --- E
········· |
······· 4.7K
········· |
···· Ground (ScrewUp connected to +5V)

P3 --- RS

· ·· ·---· R/W
···· |
Ground

I do not· know the consequenences of connecting the ground to a vlotage in this case and need to now if I have damaged the PS2 or the LCD. Any help would be greatful.

Thanks,

Archiver

Just started, Connected P0 to the +5V rail when trying to setup an
LCD display. Have I fried the BST2 or the LCD. Any commets welcome,
be nice I am not well diversed in electronics. Just having fun by
purchasing a StampWorks kit from Parallax and made it to Experiment
#11: A basic LCD Demonstratiion. Quote unQuote after loading the code
nothing visualy hapened and then I realized (after checking), I had
connected the LCD "E" pin at the junction of a 4.7K resitor ground
wire to the +5V rail.

The schematics:

P4 --- D4
P5 --- D5
P6 --- D6
P7 --- D7

P0 --- * --- E
|
4.7K
|
Ground (ScrewUp connected to +5V)

P3 --- RS

--- R/W
|
Ground

I do not know the consequenences of connecting the ground to a
vlotage in this case and need to now if I have damaged the PS2 or the
LCD. Any help would be greatful.

Thanks,

Archiver

Hi,

If I understand correctly you tied the Stamp's P0 directly to +5V
while it is used to control the E input of the LCD.
This may have damaged your P0 output as soon as it was pulled low,
creating a short between +5V and ground.
See if the P0 still switches without the LCD using a simple testprogram.

Greetings peter

Archiver

Thanks,

I went back to the begining and could still flash an LED using P0, rewired
the LCD and ran the program, still didn't display anything on the LCD. When
all else fails adjust the brightness control, simple problem simple
solution. Thanks for your reply, it redirected me to the beginning and I
realized my mistake.

---

Original Message

---

From: "Peter Verkaik" <peterverkaik@b...>
To: <basicstamps@yahoogroups.com>
Sent: Saturday, June 09, 2001 4:16 AM
Subject: [noparse][[/noparse]basicstamps] RE:screwedup


> Hi,
>
> If I understand correctly you tied the Stamp's P0 directly to +5V
> while it is used to control the E input of the LCD.
> This may have damaged your P0 output as soon as it was pulled low,
> creating a short between +5V and ground.
> See if the P0 still switches without the LCD using a simple testprogram.
>
> Greetings peter
>
>
>
> To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
> from the same email address that you subscribed with. Text in the Subject
and Body of the message will be ignored.
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>

Archiver

I started out the sameway you did, and wrote a little article about it:
http://www.weethet.nl/english/basicstamp2_lcdcontrol.htm

Hans Luyten
Webmaster http://www.weethet.nl

---

Original Message

---

From: Terry Neider [noparse][[/noparse]mailto:tn9821@hotmail.com]
Sent: zaterdag 9 juni 2001 10:50
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] ScrewedUp

Just started, Connected P0 to the +5V·rail when trying to setup an LCD display. Have I fried the BST2 or the LCD. Any commets welcome, be nice I am not·well diversed in electronics. Just having fun by purchasing·a StampWorks kit from Parallax and made it to Experiment #11: A basic LCD Demonstratiion. Quote unQuote after loading the code nothing visualy hapened and then I realized (after checking), I had connected the LCD·"E" pin at the junction of·a 4.7K resitor·ground wire to the +5V rail. The schematics:

P4 --- D4
P5 --- D5
P6 --- D6
P7 --- D7

P0 --- * --- E
········· |
······· 4.7K
········· |
···· Ground (ScrewUp connected to +5V)

P3 --- RS

· ·· ·---· R/W
···· |
Ground

I do not· know the consequenences of connecting the ground to a vlotage in this case and need to now if I have damaged the PS2 or the LCD. Any help would be greatful.

Thanks,

To UNSUBSCRIBE, just send mail to:
· basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed with.· Text in the Subject and Body of the message will be ignored.


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