moto madness

[Avi]

Why then does the development board I just built run LEDs off PTB2 and PTB4,
which are NOT specified to have enough current sinking capabilities.\

Secondly, are all the people on this group this unfrie3ndly or is it just
YOU!(Spehro Pefhany)

 

[Frank Bemelman]

Why then does the development board I just built run LEDs off PTB2 and PTB4,
which are NOT specified to have enough current sinking capabilities.\

Secondly, are all the people on this group this unfrie3ndly or is it just
YOU!(Spehro Pefhany)

You're an idiot. Spehro is one of the nicest guys around here.
I'm also not going to guess what development board you have
put together, and I couldn't care less about your PTBx current
capabilities.

 

[Sir Charles W. Shults III]

Why then does the development board I just built run LEDs off PTB2 and PTB4,
which are NOT specified to have enough current sinking capabilities.\

Secondly, are all the people on this group this unfrie3ndly or is it just
YOU!(Spehro Pefhany)

Spehro is great- he is helpful and nice to people. What the heck are you
talking about?

Cheers!

Chip Shults
My robotics, space and CGI web page - http://home.cfl.rr.com/aichip

 

[Mark Fergerson]

Why then does the development board I just built run LEDs off PTB2 and PTB4,
which are NOT specified to have enough current sinking capabilities.\

Are they specified to _not_ be able to sink enough
currenr? Where'd you get the LEDs? Are you killing it slowly?

Secondly, are all the people on this group this unfrie3ndly or is it just
YOU!(Spehro Pefhany)

Any poster here (or anywhere else for that matter) is
capable of being an asshole at any time (as you ably
demonstrate). Grow some skin, already.

Mark L. Fergerson

 

[Spehro Pefhany]

Why then does the development board I just built run LEDs off PTB2 and PTB4,
which are NOT specified to have enough current sinking capabilities.\

Sounds like you've had a look at the data sheet, that's an excellent
start.

There's nothing magic about driving LEDs, any logic output can do it.

The available current is probably lower on the outputs you mention,
than the others. So, one can use better LEDs or settle for less
brightness, or both.

Look at the electrical specifications section in the data sheet and
see how the output drive current is spec'd. Something like Vol at a
given current.

Secondly, are all the people on this group this unfrie3ndly or is it just
YOU!(Spehro Pefhany)

No one here owes you anything, Avi. These are rather complex devices,
(almost) fully described by their voluminous documentation, which is
EASILY available online. If you try to understand it and have
problems, probably someone here will be more than helpful. If your
effort is obviously limited or nonexistent, chances are so will ours
be.

Best regards,
Spehro Pefhany

 

[John Fields]

Why then does the development board I just built run LEDs off PTB2 and PTB4,
which are NOT specified to have enough current sinking capabilities.\

---
It may just be that even though the ports won't supply the 10 amps you
need to run your LEDs they're supplying enough current to allow the LEDs
to make some light. You may just want to measure the output voltage at
the port when the LED is being driven and check that voltage against
what the data sheet says you should have there for the current you're
sourcing or sinking out of/into that port. That is, if you can read the
data sheet.
---

Secondly, are all the people on this group this unfrie3ndly or is it just
YOU!(Spehro Pefhany)

---
Spehro's one of the friendliest folks here, (except for me, of course)
but when you ask a stupid-ass question like,

"Apparrently the motorola MC68HC908JL3 has 10 LED driving I/O pins. I
cannot find which of the 23 I/O pins they are . Any Ideas?"

It rapidly becomes apparent that either you're too goddam lazy or too
fucking stupid to read the data sheet, so what do you expect?

Take it to sci.electronics.basics, where there are no stupid questions.

 

[Jim Thompson]

---
It may just be that even though the ports won't supply the 10 amps you
need to run your LEDs they're supplying enough current to allow the LEDs
to make some light. You may just want to measure the output voltage at
the port when the LED is being driven and check that voltage against
what the data sheet says you should have there for the current you're
sourcing or sinking out of/into that port. That is, if you can read the
data sheet.
---


---
Spehro's one of the friendliest folks here, (except for me, of course)
but when you ask a stupid-ass question like,

"Apparrently the motorola MC68HC908JL3 has 10 LED driving I/O pins. I
cannot find which of the 23 I/O pins they are . Any Ideas?"

It rapidly becomes apparent that either you're too goddam lazy or too
fucking stupid to read the data sheet, so what do you expect?

Take it to sci.electronics.basics, where there are no stupid questions.

And only ignorant posters ?

...Jim Thompson

 

[Jonathan Kirwan]

On Wed, 16 Jul 2003 15:43:03 -0500, John Fields


And only ignorant posters ?

...Jim Thompson

Better watch that, Jim. John Fields just posted in there a few
days ago. And it wasn't his first time.

Jon

 

[John Fields]

On Wed, 16 Jul 2003 13:47:09 -0700, Jim Thompson

:1>On Wed, 16 Jul 2003 15:43:03 -0500, John Fields

 

[John Devereux]

Why then does the development board I just built run LEDs off PTB2 and PTB4,
which are NOT specified to have enough current sinking capabilities.

Perhaps it is a marginal (poor) design?

Secondly, are all the people on this group this unfrie3ndly or is it just
YOU!(Spehro Pefhany)

You think *Spehro* is unfriendly? Wow, are you in for a culture shock

 

[Avi]

I'm new to this stuff, gimme a break. I didn't even know what current drives
an LED before I asked the question. I wont ask any more stupid questions!
thanx
avi

 

[Guest]

This is the way I see it: If someone is
a little rude but yet he helps you, then you need
to judge him by what he does and not by what he says, so
maybee he was rude, but you got the advise to help you with
your project, so on balance you came out better off, hence
you should be reasonably happy.