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New to eagle cad feed back problems i think.. [message #171112] Mon, 31 July 2017 19:52 Go to next message
Gary burke
Messages: 2
Registered: July 2017
Junior Member
I have my first board, it has some optic sensors connected with led's so I can see whats going on...

Problem is when I trip one sensor all the led's are lighting so I assume the gnds or power have to be
run different the signal is separate from the rest of the connections and just leaves the board when tripped

so I am guessing the power or gnd is pulling all the leds high...

Any suggestion to isolate this some how..?

Thanks gary

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Re: New to eagle cad feed back problems i think.. [message #171117 is a reply to message #171112] Tue, 01 August 2017 06:03 Go to previous messageGo to next message
Joern Paschedag
Messages: 1455
Registered: August 2008
Senior Member
Am 31.07.2017 um 21:52 schrieb Gary burke:
> I have my first board, it has some optic sensors connected with led's so I can see whats going on...
>
> Problem is when I trip one sensor all the led's are lighting so I assume the gnds or power have to be
> run different the signal is separate from the rest of the connections and just leaves the board when tripped
>
> so I am guessing the power or gnd is pulling all the leds high...
>
> Any suggestion to isolate this some how..?
>
> Thanks gary
>
> --
> To view any images and attachments in this post, visit:
> https://www.element14.com/community/message/226397
>

I'm gessing that diode D758 is connected wrong.

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Mit freundlichen Grüßen / With best regards

Joern Paschedag
Re: New to eagle cad feed back problems i think.. [message #171125 is a reply to message #171117] Tue, 01 August 2017 12:57 Go to previous messageGo to next message
Chuck Huber
Messages: 601
Registered: October 2004
Senior Member
<html>
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<div class="moz-cite-prefix">On 08/01/2017 02:03 AM, Joern Paschedag
wrote:<br>
</div>
<blockquote type="cite" cite="mid:olp5kc$962$1@baboon.cadsoft.de">Am
31.07.2017 um 21:52 schrieb Gary burke:
<br>
<blockquote type="cite">I have my first board, it has some optic
sensors connected with led's so I can see whats going on...
<br>
<br>
Problem is when I trip one sensor all the led's are lighting so
I assume the gnds or power have to be
<br>
run different the signal is separate from the rest of the
connections and just leaves the board when tripped
<br>
<br>
so I am guessing the power or gnd is pulling all the leds
high...
<br>
<br>
Any suggestion to isolate this some how..?
<br>
<br>
Thanks gary
<br>
<br>
--
<br>
To view any images and attachments in this post, visit:
<br>
<a class="moz-txt-link-freetext" href="https://www.element14.com/community/message/226397">https://www.element14.com/community/message/226397</a>
<br>
<br>
</blockquote>
<br>
I'm gessing that diode D758 is connected wrong.
<br>
<br>
</blockquote>
<br>
That's a good guess.<br>
<br>
Another thing to check is that the light from the LED's may be
feeding back into the optic sensors, keeping everything tripped. 
Then there's always ambient light running at 50 or 60 Hz (depending
on your location on the Earth), re-tripping the board on every
half-cycle.<br>
<br>
If the board is operated outside, then there's a constant
illumination of the sensors, except, of course, when swallows
migrate.  Then one must account for rate at which the bird's wings
beat, which, under certain circumstances, can produce a pulsating
waveform in the optical sensors.  The duration of such a pulsating
waveform is limited to the time the light from the sun is
interrupted by the avian, and <i>that</i> can only be answered if
one knows the airspeed of an unlaiden swallow.<br>
<br>
<br>
<br>
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Re: New to eagle cad feed back problems i think.. [message #171129 is a reply to message #171125] Tue, 01 August 2017 16:40 Go to previous message
Gary burke
Messages: 2
Registered: July 2017
Junior Member
could be the diodes will check that...
I was thinking would a Schmitt Trigger work? i have 8 optic sensors and a digital probe connected..
all with led's plus a power led....

Thanks gary

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