LED project

Archiver

Hi All,
I am pretty new to this and need some help. I have the Basic Stamp
BS2SX and the Basic Stamp 2 carrier board and want to do the first
project in the Stamp works book lighting up a LED. I don't
understand how to wire the LED to the board.
The book says that each of the general-purpose I/O pins can source
and sink 30 mA. What is source and sink? Does that mean the pins
can output up to 30 mA or take in that? Or some thing else.
The LED I got says on the box Power Dissipation: 75 mW. What does
that mean? Also Forward Current: 25mA. Is that how much mA it can
take? It also says Forward Voltage: 2.1V Ok I am thinking that
means that I will have a wire going from a power source on the board
then a resister to make it = 2.1V for the LED. But does the power
come from pin 0 or the VDD pin 21? How do I know how much mA is
there and how do I control that. I guess at this time I am thinking
that I would have a wire coming from pin 0 that would go to a
resister that would be connected to the LED and then a wire from the
short lead - on the Led to pin 23 VSS ground. Or would the Pin 0 be
the ground with power coming from Pin 21 VDD? Or would pin 0 go to
some kind of a relay? I really don't know to much about electical
stuff as you can probably tell and would really be glad if some one
could help me get started on this.
Thanks a lot
Jim ygg@g...

Archiver

As per your questions: Well yes it to both, it can
sink 30ma into your projects.. Also you will not want
to sink any more than that into the stamp... As for
wirning, you wil need a ristor on the grounded side of
the led. And yes you can power the circut from the
stamp, and you will also want to ground it from the
stamp. And well I would pass the the relay
idea.....good luck
--- yggloki <ygg@g...> wrote:
> Hi All,
> I am pretty new to this and need some help. I have
> the Basic Stamp
> BS2SX and the Basic Stamp 2 carrier board and want
> to do the first
> project in the Stamp works book lighting up a LED.
> I don't
> understand how to wire the LED to the board.
> The book says that each of the general-purpose I/O
> pins can source
> and sink 30 mA. What is source and sink? Does that
> mean the pins
> can output up to 30 mA or take in that? Or some
> thing else.
> The LED I got says on the box Power Dissipation:
> 75 mW. What does
> that mean? Also Forward Current: 25mA. Is that how
> much mA it can
> take? It also says Forward Voltage: 2.1V Ok I am
> thinking that
> means that I will have a wire going from a power
> source on the board
> then a resister to make it = 2.1V for the LED. But
> does the power
> come from pin 0 or the VDD pin 21? How do I know
> how much mA is
> there and how do I control that. I guess at this
> time I am thinking
> that I would have a wire coming from pin 0 that
> would go to a
> resister that would be connected to the LED and then
> a wire from the
> short lead - on the Led to pin 23 VSS ground. Or
> would the Pin 0 be
> the ground with power coming from Pin 21 VDD? Or
> would pin 0 go to
> some kind of a relay? I really don't know to much
> about electical
> stuff as you can probably tell and would really be
> glad if some one
> could help me get started on this.
> Thanks a lot
> Jim ygg@g...
>
>
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Archiver

There is a lot of good "starter" information on the Parallax Stamps-In-Class
web site. Based on your post, I'd suggest downloading "What's a
Microcontroller" from this link:

http://www.stampsinclass.com/html_files/sic_curr/curriculum_wam.asp

It will answer a lot of your questions and help you get started with your
Stamp. After that, you can move on to:

* Basic Analog and Digital
* Robotics
* Earth Measurements
* Industrial Control

Once you get the hang of things, electrically, you might also consider our
StampWorks book (also available for download on the main site).

-- Jon Williams
-- Parallax


In a message dated 2/14/02 10:27:56 PM Central Standard Time, ygg@g...
writes:


> Hi All,
> I am pretty new to this and need some help. I have the Basic Stamp
> BS2SX and the Basic Stamp 2 carrier board and want to do the first
> project in the Stamp works book lighting up a LED. I don't
> understand how to wire the LED to the board.
> The book says that each of the general-purpose I/O pins can source
> and sink 30 mA. What is source and sink? Does that mean the pins
> can output up to 30 mA or take in that? Or some thing else.
> The LED I got says on the box Power Dissipation: 75 mW. What does
> that mean? Also Forward Current: 25mA. Is that how much mA it can
> take? It also says Forward Voltage: 2.1V Ok I am thinking that
> means that I will have a wire going from a power source on the board
> then a resister to make it = 2.1V for the LED. But does the power
> come from pin 0 or the VDD pin 21? How do I know how much mA is
> there and how do I control that. I guess at this time I am thinking
> that I would have a wire coming from pin 0 that would go to a
> resister that would be connected to the LED and then a wire from the
> short lead - on the Led to pin 23 VSS ground. Or would the Pin 0 be
> the ground with power coming from Pin 21 VDD? Or would pin 0 go to
> some kind of a relay? I really don't know to much about electical
> stuff as you can probably tell and would really be glad if some one
> could help me get started on this.




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