BS2SX relay help.
After a little phone time with Parallax tech support, I was directed
to this group for some help. This is what I need:
1. Actuate 16 relays from my board (BOE).
I know that I cannot pull any more than 30mA per I/O, thus my
problem.
I need to find a company that sells relays that actuate at 5V and
pull no more than 25mA. I am using these relays to turn on and off
equipment that runs at 24VAC. I am just going to put a transformer on
the other side of the relays to run the equipment. PLEASE HELP!
~Joe
to this group for some help. This is what I need:
1. Actuate 16 relays from my board (BOE).
I know that I cannot pull any more than 30mA per I/O, thus my
problem.
I need to find a company that sells relays that actuate at 5V and
pull no more than 25mA. I am using these relays to turn on and off
equipment that runs at 24VAC. I am just going to put a transformer on
the other side of the relays to run the equipment. PLEASE HELP!
~Joe
Comments
using a simple transistor driver to drive any relay. This not only relaxes
the current requirement, but it is quite cheap and protects your relatively
expensive processor.
Read http://www.al-williams.com/wd5gnr/stampfaq.htm#s2.5
Regards,
Al Williams
AWC
* SALE: PAK-IX Floating Point A/D - http://www.al-williams.com/awce/pak9.htm
>
Original Message
> From: hellerj@p... [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=M9I9LyOmWaCjOvDMbLmy23SujuTyC5BJemMVCZTHFGawiNbBBBEh3RS4PTMV2xTEt7KOgP4Whm63ZnsO]hellerj@p...[/url
> Sent: Friday, July 20, 2001 10:00 AM
> To: basicstamps@yahoogroups.com
> Subject: [noparse][[/noparse]basicstamps] BS2SX relay help.
>
>
> After a little phone time with Parallax tech support, I was directed
> to this group for some help. This is what I need:
>
> 1. Actuate 16 relays from my board (BOE).
> I know that I cannot pull any more than 30mA per I/O, thus my
> problem.
>
> I need to find a company that sells relays that actuate at 5V and
> pull no more than 25mA. I am using these relays to turn on and off
> equipment that runs at 24VAC. I am just going to put a transformer on
> the other side of the relays to run the equipment. PLEASE HELP!
> ~Joe
>
>
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>
BTW, are mechanical relays really necessary? There are a number of
non-mechanical ways to do on/off switching that are often preferred....
Chris
you'd be
> better off
> using a simple transistor driver to drive any relay. This not
> only relaxes
> the current requirement, but it is quite cheap and protects
> your relatively
> expensive processor.
>
> Read http://www.al-williams.com/wd5gnr/stampfaq.htm#s2.5
>
>
regulator and pins. Fortunately, the BOE has a healthy regulator that *may*
run all 16 relays at once. You can use a 2N222 transistor, an 1N914 and a
10k resistor to run any kind of small 5 volt relay. Might try Mouser.com,
RadioShack.com or DigiKey for the relays.
Original Message
> After a little phone time with Parallax tech support, I was directed
> to this group for some help. This is what I need:
>
> 1. Actuate 16 relays from my board (BOE).
> I know that I cannot pull any more than 30mA per I/O, thus my
> problem.
>
> I need to find a company that sells relays that actuate at 5V and
> pull no more than 25mA. I am using these relays to turn on and off
> equipment that runs at 24VAC. I am just going to put a transformer on
> the other side of the relays to run the equipment. PLEASE HELP!
>After a little phone time with Parallax tech support, I was directed
>to this group for some help. This is what I need:
>
>1. Actuate 16 relays from my board (BOE).
> I know that I cannot pull any more than 30mA per I/O, thus my
>problem.
>
>I need to find a company that sells relays that actuate at 5V and
>pull no more than 25mA. I am using these relays to turn on and off
>equipment that runs at 24VAC. I am just going to put a transformer on
>the other side of the relays to run the equipment. PLEASE HELP!
>~Joe
Hi Joe -
One way do accomplish this is with an addressable relay driver.
The following web link is a typical unit from Philips:
http://www.semiconductors.philips.com/pip/ne5090n
Regards,
Bruce Bates
uln2803 driver this chip will allow you to use 12 volt relays ( cheaper and
more types )
Original Message
From: Bruce Bates <bvbates@u...>
To: <basicstamps@yahoogroups.com>
Sent: July 20, 2001 3:07 PM
Subject: Re: [noparse][[/noparse]basicstamps] BS2SX relay help.
> At 7/20/2001 Friday 10:59 AM, hellerj@p... promulgated:
> >After a little phone time with Parallax tech support, I was directed
> >to this group for some help. This is what I need:
> >
> >1. Actuate 16 relays from my board (BOE).
> > I know that I cannot pull any more than 30mA per I/O, thus my
> >problem.
> >
> >I need to find a company that sells relays that actuate at 5V and
> >pull no more than 25mA. I am using these relays to turn on and off
> >equipment that runs at 24VAC. I am just going to put a transformer on
> >the other side of the relays to run the equipment. PLEASE HELP!
> >~Joe
> Hi Joe -
>
> One way do accomplish this is with an addressable relay driver.
> The following web link is a typical unit from Philips:
> http://www.semiconductors.philips.com/pip/ne5090n
>
> Regards,
>
> Bruce Bates
>
>
>
> 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/
>
>
look for the dt106 board for a start this is a 4 relay board
Original Message
From: Bruce Bates <bvbates@u...>
To: <basicstamps@yahoogroups.com>
Sent: July 20, 2001 3:07 PM
Subject: Re: [noparse][[/noparse]basicstamps] BS2SX relay help.
> At 7/20/2001 Friday 10:59 AM, hellerj@p... promulgated:
> >After a little phone time with Parallax tech support, I was directed
> >to this group for some help. This is what I need:
> >
> >1. Actuate 16 relays from my board (BOE).
> > I know that I cannot pull any more than 30mA per I/O, thus my
> >problem.
> >
> >I need to find a company that sells relays that actuate at 5V and
> >pull no more than 25mA. I am using these relays to turn on and off
> >equipment that runs at 24VAC. I am just going to put a transformer on
> >the other side of the relays to run the equipment. PLEASE HELP!
> >~Joe
> Hi Joe -
>
> One way do accomplish this is with an addressable relay driver.
> The following web link is a typical unit from Philips:
> http://www.semiconductors.philips.com/pip/ne5090n
>
> Regards,
>
> Bruce Bates
>
>
>
> 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/
>
>
> >pull no more than 25mA. I am using these relays to turn on and off
> >equipment that runs at 24VAC. I am just going to put a transformer on
> >the other side of the relays to run the equipment. PLEASE HELP!
Joe,
Also look at http://www.aromat.com/ECD.htm. Aromat is a big player in the
low power relay buisness. They have a line of 50 mW relays (that's 4.5V at
around 11mA). You can also probably use photoMOS relays which will take
lower current (approx 10 mA or less). If I had my high speed link like I do
at work, I'd look them up for ya, but at home I have a whopping 24K internet
connection [noparse]:)[/noparse] ....
Take care!
John
isolation. I know they are available from Digikey but I do not have the
part number handy. I think they are made by arromat or something like that.
I used them in a show controller run from a 16C74 PIC processor and had
some severe current limitations. They worked great and have had no problems
in the field.
Larry
At 02:59 PM 7/20/01 -0000, you wrote:
>After a little phone time with Parallax tech support, I was directed
>to this group for some help. This is what I need:
>
>1. Actuate 16 relays from my board (BOE).
> I know that I cannot pull any more than 30mA per I/O, thus my
>problem.
>
>I need to find a company that sells relays that actuate at 5V and
>pull no more than 25mA. I am using these relays to turn on and off
>equipment that runs at 24VAC. I am just going to put a transformer on
>the other side of the relays to run the equipment. PLEASE HELP!
>~Joe
>
>
>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/
>
>
>
Larry G. Nelson Sr.
mailto:L.Nelson@i...
http://www.ultranet.com/~nr