BS2P and uln2803a
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I needing to drive some 100ma loads and the ULN2803A looks like a
great little package and nice 8-channel compliment to BS2P outputs.
(I'll need 2 for my 16 output circuit/project design) Has anybody
had experience with this device and the BS2? Looks like direct pin
connections from the BS2 to the ULN2803A inputs.
Thanks,
Guy
great little package and nice 8-channel compliment to BS2P outputs.
(I'll need 2 for my 16 output circuit/project design) Has anybody
had experience with this device and the BS2? Looks like direct pin
connections from the BS2 to the ULN2803A inputs.
Thanks,
Guy
Comments
no extra hardware needed just a good powersupply
and NOT the one on the BS2P
I guess you don't need other pins or do you got the 40 version
otherwise check out the 74HCT595 followd by the ULN2803
There are also the TPIC versions (check previous litsing or the WEB)
Rene
Oorspronkelijk bericht
Van: digital_interior [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=PjFtsZn40aXiKjZnCnIfaZoR4yQk96d4Y1rPKdUoh3X3uYQiO0mdOtUq3wDan2yDa_kziua6R8habg]guyb@m...[/url
Verzonden: vrijdag 2 augustus 2002 20:52
Aan: basicstamps@yahoogroups.com
Onderwerp: [noparse][[/noparse]basicstamps] BS2P and uln2803a
I needing to drive some 100ma loads and the ULN2803A looks like a
great little package and nice 8-channel compliment to BS2P outputs.
(I'll need 2 for my 16 output circuit/project design) Has anybody
had experience with this device and the BS2? Looks like direct pin
connections from the BS2 to the ULN2803A inputs.
Thanks,
Guy
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Stamp article #6 or #8 has info on that device.
Original Message
> I needing to drive some 100ma loads and the ULN2803A looks like a
> great little package and nice 8-channel compliment to BS2P outputs.
> (I'll need 2 for my 16 output circuit/project design) Has anybody
> had experience with this device and the BS2? Looks like direct pin
> connections from the BS2 to the ULN2803A inputs.
daweasel@s... writes:
> > I needing to drive some 100ma loads and the ULN2803A looks like a
> > great little package and nice 8-channel compliment to BS2P outputs.
> > (I'll need 2 for my 16 output circuit/project design) Has anybody
> > had experience with this device and the BS2? Looks like direct pin
> > connections from the BS2 to the ULN2803A inputs.
>
You will save a lot of pins if you use a 595 shift register to drive the ULN.
The 595 takes three I/O and has 8 outputs.
Sid
[noparse][[/noparse]Non-text portions of this message have been removed]
irlawson@i... writes:
> i'm using 3 of these to drive 24 relays to control the hydraulics in a
> machine and they do that nicely.
> just remember that they are inverters so wire the relays appropriately.
> you can drive them directly from the stamp pins.
>
The 595's are not inverters. Send them a 1 and they output a 1.
Sid
[noparse][[/noparse]Non-text portions of this message have been removed]
i'm using 3 of these to drive 24 relays to control the hydraulics in a
machine and they do that nicely.
just remember that they are inverters so wire the relays appropriately.
you can drive them directly from the stamp pins.
regards ian
Original Message
From: digital_interior <guyb@m...>
To: basicstamps@yahoogroups.com <basicstamps@yahoogroups.com>
Date: Saturday, August 03, 2002 6:52 AM
Subject: [noparse][[/noparse]basicstamps] BS2P and uln2803a
>I needing to drive some 100ma loads and the ULN2803A looks like a
>great little package and nice 8-channel compliment to BS2P outputs.
>(I'll need 2 for my 16 output circuit/project design) Has anybody
>had experience with this device and the BS2? Looks like direct pin
>connections from the BS2 to the ULN2803A inputs.
>
>Thanks,
>Guy
>
>
>To UNSUBSCRIBE, just send mail to:
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Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>
He suggested using the 595's, which I think are a shift register, to drive
the ULN's in order to save Stamp pins.
Am I correct in understanding the ULN2803s will source or sink the load
power? I got the impression they would only sink voltage.
Original Message
> > i'm using 3 of these to drive 24 relays to control the hydraulics in a
> > machine and they do that nicely.
> > just remember that they are inverters so wire the relays appropriately.
> > you can drive them directly from the stamp pins.
> >
>
> The 595's are not inverters. Send them a 1 and they output a 1.
daweasel@s... writes:
> Am I correct in understanding the ULN2803s will source or sink the load
> power? I got the impression they would only sink voltage.
>
They will sink 500ma per section.
Sid
[noparse][[/noparse]Non-text portions of this message have been removed]
I was working on using a matrix of LED's and didn't want to use the MAX
7-segment LED drivers. I looked at the ULN, but since it won't source I can
only use it for one part of the drivers. I opted for a handful of general
purpose transistors instead.
Works good -- got a BS1 driving 9 super-bright LED's using 6 pins. Those
suckers are bright, too... Hopefully the 5 x 7 displays are as bright. I
think I'll lay out a board for that one though. 9 LED's, 6 transistors and
a 15 resistors on a 2" x 2" board is a bit cramped.
Original Message
> > Am I correct in understanding the ULN2803s will source or sink the load
> > power? I got the impression they would only sink voltage.
> >
>
> They will sink 500ma per section.
Yep.. direct pin connection from the output port on the BS2 to teh
ULN2803a works fine. I've been using the ULN2803 for about 20 years in
various projects with all sorts of embedded processors over the years.
Works just fine.. the darlingtons are high gain too, so you can also
use them as a simple TTL-logic inverter if needed.
Dare
--- In basicstamps@y..., "digital_interior" <guyb@m...> wrote:
> I needing to drive some 100ma loads and the ULN2803A looks like a
> great little package and nice 8-channel compliment to BS2P outputs.
> (I'll need 2 for my 16 output circuit/project design) Has anybody
> had experience with this device and the BS2? Looks like direct pin
> connections from the BS2 to the ULN2803A inputs.
>
> Thanks,
> Guy
so you need less aditional hardware.
and yes the 74HCT595 are shift registers checkout some
datasheet's if you got more questions.
http://www.semiconductors.philips.com/pip/74hc595n
http://eu.st.com/stonline/books/pdf/docs/1536.pdf
http://www.qsl.net/wb4vlq/TPIC6A595.pdf
Good luck
Rene
Oorspronkelijk bericht
Van: Rodent [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=0W1nP9WZ7RPa7ZC6ximwpJA4Xov2wb3B47RgCne77hKsXULHJrP_5Gvvvodl_jcr8cM37Z_6RvPyoHPgdg]daweasel@s...[/url
Verzonden: vrijdag 2 augustus 2002 23:17
Aan: basicstamps@yahoogroups.com
Onderwerp: Re: [noparse][[/noparse]basicstamps] BS2P and uln2803a
No, but the ULN2803's are.
He suggested using the 595's, which I think are a shift register, to drive
the ULN's in order to save Stamp pins.
Am I correct in understanding the ULN2803s will source or sink the load
power? I got the impression they would only sink voltage.
Original Message
> > i'm using 3 of these to drive 24 relays to control the hydraulics in a
> > machine and they do that nicely.
> > just remember that they are inverters so wire the relays appropriately.
> > you can drive them directly from the stamp pins.
> >
>
> The 595's are not inverters. Send them a 1 and they output a 1.
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