Driving LCD''s
Archiver
Posts: 46,084
Firstly, re the virus scare: Got about 5 emails with .pif on the end.
Thankfully, I use a Mac. Pretty much immune to most destructive viruses.
Anyway, does anyone know how to drive an LCD without killing it?
I've come up with a circuit using 4 4094's to drive 4 digits of an LCD and
fed with 6 lines from the BS2. It works, in that the LCD segments light up.
BUT, I think I may be driving the LCD too hard and may eventually kill it.
I believe a maximum of 50mV DC component should be applied, but the average
(as measured with my DMM) is 2.5v.
However, I checked the voltage from the pins of a 7106 evaluation board I
have, and the average on it's pins is 6.3V.
Reason I'm concerned, is because after a few hours, segments seem to be a
bit "lazy" turning off with my circuit. However, I'm a little miffed due to
the reading from the 7106 board.
Should I just throw in some 10Meg resistors on each line??
To see the circuit I've come up with, just go to
http://www.lennard.net.nz/electronics/45lcdstamp.html
Of course, the circuit also works with LED displays, with a little
modification.
--
http://www.lennard.net.nz/
Ben Lennard, NCEE, Dip EE
Web Hosting and Electronics R&D
Club Coordinator, Victoria University of Wellington Hockey Club
Hm: +64 4 972 7567
Mb: +64 21 536 627
87 Spencer Street
Crofton Downs
Wellington
New Zealand
"To the optimist, the glass is half full. To the pessimist, the glass is
half empty. To the engineer, the glass is twice as big as it needs to be."
No animals were harmed in the transmission of this email, although the
Dog next door is living on borrowed time, let me tell you! Those of you
with an overwhelming fear of the unknown will be gratified to learn that
there is no hidden message revealed by reading this warning backwards.
From: "debu_sen_22" <debu_sen_22@y...>
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Watch out a virus running loose.
Date: Mon, 25 Feb 2002 6:46 PM
Yup
I got the same email. Good thing that it goes to my yahoo account,
and i checked it first before downloading it.
Debu
--- In basicstamps@y..., "Earl Bollinger" <earlwbollinger@a...> wrote:
> Watch out.
> Someone tried sending a response to a old email attaching a
> W32 virus variant it looked to be some sort of screensaver SCR file.
>
> I don't know who this is Nilaweera [noparse][[/noparse]ndharmashri@c...] that sent the
email
> but watch out for that person.
>
>
> 'Earl Bollinger' wrote:
> ====
> - I forgot the original details of this, but
> - did any of you run across this website with a lot of DDS info?
> - http://sss-mag.com/dds.html
> -
> -
> -
Original Message
> - From: Tracy Allen [noparse][[/noparse]mailto:tracy@e...]
> - Sent: Friday, February 22, 2002 10:07 PM
> - To: basicstamps@y...
> - Subject: Re: [noparse][[/noparse]basicstamps] freqout command
> -
> -
> - >Thanks! The Intel chip would be perfect except it has been
obsolete and
> - >DigiKey has No stock. Do you know of a ...'
>
>
> > Take a look to the attachment.
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. 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/
[noparse][[/noparse]Non-text portions of this message have been removed]
Thankfully, I use a Mac. Pretty much immune to most destructive viruses.
Anyway, does anyone know how to drive an LCD without killing it?
I've come up with a circuit using 4 4094's to drive 4 digits of an LCD and
fed with 6 lines from the BS2. It works, in that the LCD segments light up.
BUT, I think I may be driving the LCD too hard and may eventually kill it.
I believe a maximum of 50mV DC component should be applied, but the average
(as measured with my DMM) is 2.5v.
However, I checked the voltage from the pins of a 7106 evaluation board I
have, and the average on it's pins is 6.3V.
Reason I'm concerned, is because after a few hours, segments seem to be a
bit "lazy" turning off with my circuit. However, I'm a little miffed due to
the reading from the 7106 board.
Should I just throw in some 10Meg resistors on each line??
To see the circuit I've come up with, just go to
http://www.lennard.net.nz/electronics/45lcdstamp.html
Of course, the circuit also works with LED displays, with a little
modification.
--
http://www.lennard.net.nz/
Ben Lennard, NCEE, Dip EE
Web Hosting and Electronics R&D
Club Coordinator, Victoria University of Wellington Hockey Club
Hm: +64 4 972 7567
Mb: +64 21 536 627
87 Spencer Street
Crofton Downs
Wellington
New Zealand
"To the optimist, the glass is half full. To the pessimist, the glass is
half empty. To the engineer, the glass is twice as big as it needs to be."
No animals were harmed in the transmission of this email, although the
Dog next door is living on borrowed time, let me tell you! Those of you
with an overwhelming fear of the unknown will be gratified to learn that
there is no hidden message revealed by reading this warning backwards.
From: "debu_sen_22" <debu_sen_22@y...>
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] Re: Watch out a virus running loose.
Date: Mon, 25 Feb 2002 6:46 PM
Yup
I got the same email. Good thing that it goes to my yahoo account,
and i checked it first before downloading it.
Debu
--- In basicstamps@y..., "Earl Bollinger" <earlwbollinger@a...> wrote:
> Watch out.
> Someone tried sending a response to a old email attaching a
> W32 virus variant it looked to be some sort of screensaver SCR file.
>
> I don't know who this is Nilaweera [noparse][[/noparse]ndharmashri@c...] that sent the
> but watch out for that person.
>
>
> 'Earl Bollinger' wrote:
> ====
> - I forgot the original details of this, but
> - did any of you run across this website with a lot of DDS info?
> - http://sss-mag.com/dds.html
> -
> -
> -
Original Message
> - From: Tracy Allen [noparse][[/noparse]mailto:tracy@e...]
> - Sent: Friday, February 22, 2002 10:07 PM
> - To: basicstamps@y...
> - Subject: Re: [noparse][[/noparse]basicstamps] freqout command
> -
> -
> - >Thanks! The Intel chip would be perfect except it has been
obsolete and
> - >DigiKey has No stock. Do you know of a ...'
>
>
> > Take a look to the attachment.
To UNSUBSCRIBE, just send mail to:
basicstamps-unsubscribe@yahoogroups.com
from the same email address that you subscribed. 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/
[noparse][[/noparse]Non-text portions of this message have been removed]