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trigo(at)mail.telepac.pt
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 Posted: Sat Nov 09, 2019 11:11 am Post subject: LEDs light mystery |
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Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
[img]cid:059D9AC1-DA22-4C18-9E75-99F731530A1D[/img]
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
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cluros(at)gmail.com
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| Posted: Sat Nov 09, 2019 11:26 am Post subject: LEDs light mystery |
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If the microswitch opens the ground circuit when the door is closed, your
lights are not being grounded through that ground. They are being grounded
through the OTHER wire, the one going to the G3X. I don't know if this can
damage your G3X, but I don't think it is a good idea. You could perhaps put
a diode in the G3X wire, but a better idea might be to keep these two
separate systems separate and put in a second microswitch for the lights.
On Sat, Nov 9, 2019, 11:17 Carlos Trigo <trigo(at)mail.telepac.pt> wrote:
[quote] 
Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of
these LEDs lights
I want that these lights are lit whenever the baggage door is open, like
we have in our cars.
Therefore I connected the lights to the microswitch which already was used
to indicate that the door is open, in one of the alarm features available
in the Garmin G3X system.
This alarm feature requires that the microswitch used to indicate the open
door is connected through a ground circuit, i.e, this microswitch is a N.O.
one, and connects the circuit to ground whenever the baggage door is open
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ceengland7(at)gmail.com
Guest
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| Posted: Sat Nov 09, 2019 1:59 pm Post subject: LEDs light mystery |
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On 11/9/2019 1:09 PM, Carlos Trigo wrote:
| Quote: |  Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
[img]cid:part1.1CE2564E.E3946884(at)gmail.com[/img]
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.Â
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...Â
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
|
Do they light up with the door open if the EFIS isn't powered up? I'd bet they don't.
If they don't...
Consider that the EFIS must supply a a voltage to the microswitch (likely around 5V and very current-limited) in order to detect that the switch has closed. With the switch open (door closed), and the EFIS powered up, there's a potential difference between your 12V battery supply, and the <5V?>Â source voltage from the EFIS.
Try removing the line to the EFIS temporarily and see if the light goes out completely when the door is closed.
Of course, I could be wrong. 
Just saw Sebastian's post; as he mentioned, a diode in the EFIS sense line (pointed toward the switch) might work, as long as the diode's leakage current isn't high enough to light the LED, and its forward voltage drop isn't high enough to keep the EFIS from seeing switch closure. a Schottky diode might help that issue.
Charlie
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trigo(at)mail.telepac.pt
Guest
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| Posted: Sun Nov 10, 2019 4:30 am Post subject: LEDs light mystery |
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Thanks to Sebastien and to Charlie, for your answers.
I am now considering 2 separate circuits, one for the ground to command the door alarm, and the other to switch the + circuit to the lights.
Does anyone know about a DPST microswitch?
Carlos
Enviado do meu iPhone
| Quote: | No dia 09/11/2019, Ã s 22:10, Charlie England <ceengland7(at)gmail.com> escreveu:
 On 11/9/2019 1:09 PM, Carlos Trigo wrote:
| Quote: |  Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
<11-09255m.jpg>
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
|
Do they light up with the door open if the EFIS isn't powered up? I'd bet they don't.
If they don't...
Consider that the EFIS must supply a a voltage to the microswitch (likely around 5V and very current-limited) in order to detect that the switch has closed. With the switch open (door closed), and the EFIS powered up, there's a potential difference between your 12V battery supply, and the <5V?> source voltage from the EFIS.
Try removing the line to the EFIS temporarily and see if the light goes out completely when the door is closed.
Of course, I could be wrong.
Just saw Sebastian's post; as he mentioned, a diode in the EFIS sense line (pointed toward the switch) might work, as long as the diode's leakage current isn't high enough to light the LED, and its forward voltage drop isn't high enough to keep the EFIS from seeing switch closure. a Schottky diode might help that issue.
Charlie
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ceengland7(at)gmail.com
Guest
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| Posted: Sun Nov 10, 2019 6:04 am Post subject: LEDs light mystery |
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On Sun, Nov 10, 2019 at 6:35 AM Carlos Trigo <trigo(at)mail.telepac.pt> wrote:
[quote] Thanks to Sebastien and to Charlie, for your answers.
I am now considering 2 separate circuits, one for the ground to command
the door alarm, and the other to switch the + circuit to the lights.
Does anyone know about a DPST microswitch?
Carlos
Enviado do meu iPhone
No dia 09/11/2019, Ã s 22:10, Charlie England <ceengland7(at)gmail.com>
escreveu:

On 11/9/2019 1:09 PM, Carlos Trigo wrote:

Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of
these LEDs lights
<11-09255m.jpg>
I want that these lights are lit whenever the baggage door is open, like
we have in our cars.
Therefore I connected the lights to the microswitch which already was used
to indicate that the door is open, in one of the alarm features available
in the Garmin G3X system.
This alarm feature requires that the microswitch used to indicate the open
door is connected through a ground circuit, i.e, this microswitch is a N.O.
one, and connects the circuit to ground whenever the baggage door is open
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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cluros(at)gmail.com
Guest
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| Posted: Sun Nov 10, 2019 6:53 am Post subject: LEDs light mystery |
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One microswitch with two poles! Of course. Simple once you think of it  .
On Sun, Nov 10, 2019, 06:10 Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: |
On Sun, Nov 10, 2019 at 6:35 AM Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Thanks to Sebastien and to Charlie, for your answers.
I am now considering 2 separate circuits, one for the ground to command the door alarm, and the other to switch the + circuit to the lights.
Does anyone know about a DPST microswitch?
CarlosÂ
Enviado do meu iPhone
| Quote: | No dia 09/11/2019, Ã s 22:10, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> escreveu:
 On 11/9/2019 1:09 PM, Carlos Trigo wrote:
| Quote: |  Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
<11-09255m.jpg>
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.Â
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...Â
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
|
Do they light up with the door open if the EFIS isn't powered up? I'd bet they don't.
If they don't...
Consider that the EFIS must supply a a voltage to the microswitch (likely around 5V and very current-limited) in order to detect that the switch has closed. With the switch open (door closed), and the EFIS powered up, there's a potential difference between your 12V battery supply, and the <5V?>Â source voltage from the EFIS.
Try removing the line to the EFIS temporarily and see if the light goes out completely when the door is closed.
Of course, I could be wrong.
Just saw Sebastian's post; as he mentioned, a diode in the EFIS sense line (pointed toward the switch) might work, as long as the diode's leakage current isn't high enough to light the LED, and its forward voltage drop isn't high enough to keep the EFIS from seeing switch closure. a Schottky diode might help that issue.
Charlie
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|
Well, according to 'the google', there are options. Here are one company's selections. DPDT are actually cheaper than DPST:
https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-noÂ
|
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Sun Nov 10, 2019 7:07 am Post subject: Re: LEDs light mystery |
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The attached pictures are my interpretation of Carlos' description of the circuit.
In the top circuit, I have inserted a diode as suggested by others.
That is the easiest solution. A 1N4148 should work.
The bottom circuit requires reversing the switch logic and EFIS input logic
which should be easier than purchasing a new switch and installing it.
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?AeroElectric-List |
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33.04 KB |
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8636 Time(s) |
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_________________
Joe Gores |
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trigo(at)mail.telepac.pt
Guest
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| Posted: Sun Nov 10, 2019 8:12 am Post subject: LEDs light mystery |
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???
If you mean 2 microswitches, there is no space for them...
| Quote: | No dia 10/11/2019, Ã s 15:00, Sebastien <cluros(at)gmail.com> escreveu:
One microswitch with two poles! Of course. Simple once you think of it .
On Sun, Nov 10, 2019, 06:10 Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> wrote:
| Quote: |
On Sun, Nov 10, 2019 at 6:35 AM Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Thanks to Sebastien and to Charlie, for your answers.
I am now considering 2 separate circuits, one for the ground to command the door alarm, and the other to switch the + circuit to the lights.
Does anyone know about a DPST microswitch?
Carlos
Enviado do meu iPhone
| Quote: | No dia 09/11/2019, Ã s 22:10, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> escreveu:
 On 11/9/2019 1:09 PM, Carlos Trigo wrote:
| Quote: |  Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
<11-09255m.jpg>
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
|
Do they light up with the door open if the EFIS isn't powered up? I'd bet they don't.
If they don't...
Consider that the EFIS must supply a a voltage to the microswitch (likely around 5V and very current-limited) in order to detect that the switch has closed. With the switch open (door closed), and the EFIS powered up, there's a potential difference between your 12V battery supply, and the <5V?> source voltage from the EFIS.
Try removing the line to the EFIS temporarily and see if the light goes out completely when the door is closed.
Of course, I could be wrong.
Just saw Sebastian's post; as he mentioned, a diode in the EFIS sense line (pointed toward the switch) might work, as long as the diode's leakage current isn't high enough to light the LED, and its forward voltage drop isn't high enough to keep the EFIS from seeing switch closure. a Schottky diode might help that issue.
Charlie
|
|
Well, according to 'the google', there are options. Here are one company's selections. DPDT are actually cheaper than DPST:
https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-no
|
|
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http://www.matronics.com/Navigator?AeroElectric-List |
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Eric Page
Joined: 15 Feb 2017
Posts: 242
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| Posted: Sun Nov 10, 2019 8:22 am Post subject: LEDs light mystery |
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Joe, check your diagram again. In option two, it looks like you still changed the switch and forgot to swap the circuit polarity; it shows a SPDT, and it's still switching the EFIS input to ground.
Is this what you intended, using the existing switch?
[img]cid:a669a7cb-2692-9d91-c8ae-25d966131055(at)yahoo.com[/img]">
Cheers,
Eric
--> AeroElectric-List message posted by: "user9253" <fransew(at)gmail.com (fransew(at)gmail.com)>
The attached pictures are my interpretation of Carlos' description of the circuit.
In the top circuit, I have inserted a diode as suggested by others.
That is the easiest solution. A 1N4148 should work.
The bottom circuit requires reversing the switch logic and EFIS input logic
which should be easier than purchasing a new switch and installing it.
--------
Joe Gores
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http://www.matronics.com/Navigator?AeroElectric-List |
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cluros(at)gmail.com
Guest
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| Posted: Sun Nov 10, 2019 8:26 am Post subject: LEDs light mystery |
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I did mean that Carlos, but only because I wasn't smart enough to think of
a DP microswitch.
On Sun, Nov 10, 2019, 08:19 Carlos Trigo <trigo(at)mail.telepac.pt> wrote:
[quote] ???
If you mean 2 microswitches, there is no space for them...
No dia 10/11/2019, Ã s 15:00, Sebastien <cluros(at)gmail.com> escreveu:

One microswitch with two poles! Of course. Simple once you think of it
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http://www.matronics.com/Navigator?AeroElectric-List |
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user9253
Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan
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| Posted: Sun Nov 10, 2019 9:41 am Post subject: Re: LEDs light mystery |
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Eric, I drew the circuit as I intended. I assumed that the existing switch is
SPDT and that the EFIS input is currently connected to the normally open
switch terminal that gets grounded when the door is open. I suggested that
the EFIS input wire be moved to the other switch terminal so that the EFIS
input is always grounded except when the door is open. That will require
going into the EFIS setup menu and changing the logic so that the alarm will
sound when the EFIS input is not grounded. If I made a mistake, let me
know. It is confusing when talking about a switch opening and closing, and
also talking about a door opening and closing, and they might not both be
open at the same time.
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trigo(at)mail.telepac.pt
Guest
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| Posted: Sun Nov 10, 2019 9:46 am Post subject: LEDs light mystery |
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Charlie
A DPDT would not suit my need, it has to be a DPST.
And I am not finding a DPST - N.O., which one is it?
Carlos
| Quote: | No dia 10/11/2019, Ã s 14:12, Charlie England <ceengland7(at)gmail.com> escreveu:

On Sun, Nov 10, 2019 at 6:35 AM Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Thanks to Sebastien and to Charlie, for your answers.
I am now considering 2 separate circuits, one for the ground to command the door alarm, and the other to switch the + circuit to the lights.
Does anyone know about a DPST microswitch?
Carlos
Enviado do meu iPhone
| Quote: | No dia 09/11/2019, Ã s 22:10, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> escreveu:
 On 11/9/2019 1:09 PM, Carlos Trigo wrote:
| Quote: |  Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
<11-09255m.jpg>
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
|
Do they light up with the door open if the EFIS isn't powered up? I'd bet they don't.
If they don't...
Consider that the EFIS must supply a a voltage to the microswitch (likely around 5V and very current-limited) in order to detect that the switch has closed. With the switch open (door closed), and the EFIS powered up, there's a potential difference between your 12V battery supply, and the <5V?> source voltage from the EFIS.
Try removing the line to the EFIS temporarily and see if the light goes out completely when the door is closed.
Of course, I could be wrong.
Just saw Sebastian's post; as he mentioned, a diode in the EFIS sense line (pointed toward the switch) might work, as long as the diode's leakage current isn't high enough to light the LED, and its forward voltage drop isn't high enough to keep the EFIS from seeing switch closure. a Schottky diode might help that issue.
Charlie
|
|
Well, according to 'the google', there are options. Here are one company's selections. DPDT are actually cheaper than DPST:
[url=https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-no]https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-no[/url]
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trigo(at)mail.telepac.pt
Guest
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| Posted: Sun Nov 10, 2019 9:48 am Post subject: LEDs light mystery |
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I will try option One.
Although I am more inclined to use 2 separate circuits.
Thanks
Carlos
Enviado do meu iPhone
| Quote: | No dia 10/11/2019, Ã s 15:13, user9253 <fransew(at)gmail.com> escreveu:

The attached pictures are my interpretation of Carlos' description of the circuit.
In the top circuit, I have inserted a diode as suggested by others.
That is the easiest solution. A 1N4148 should work.
The bottom circuit requires reversing the switch logic and EFIS input logic
which should be easier than purchasing a new switch and installing it.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=492666#492666
Attachments:
http://forums.matronics.com//files/baggage_door_298.jpg
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ceengland7(at)gmail.com
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| Posted: Sun Nov 10, 2019 10:16 am Post subject: LEDs light mystery |
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On 11/10/2019 11:44 AM, Carlos Trigo wrote:
| Quote: | CharlieÂ
A DPDT would not suit my need, it has to be a DPST.
And I am not finding a DPST - N.O., which one is it?
Carlos
| Quote: | No dia 10/11/2019, Ã s 14:12, Charlie England <ceengland7(at)gmail.com> (ceengland7(at)gmail.com) escreveu:

On Sun, Nov 10, 2019 at 6:35 AM Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Thanks to Sebastien and to Charlie, for your answers.
I am now considering 2 separate circuits, one for the ground to command the door alarm, and the other to switch the + circuit to the lights.
Does anyone know about a DPST microswitch?
CarlosÂ
Enviado do meu iPhone
| Quote: | No dia 09/11/2019, Ã s 22:10, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> escreveu:
 On 11/9/2019 1:09 PM, Carlos Trigo wrote:
| Quote: |  Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
<11-09255m.jpg>
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.Â
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...Â
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
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Do they light up with the door open if the EFIS isn't powered up? I'd bet they don't.
If they don't...
Consider that the EFIS must supply a a voltage to the microswitch (likely around 5V and very current-limited) in order to detect that the switch has closed. With the switch open (door closed), and the EFIS powered up, there's a potential difference between your 12V battery supply, and the <5V?>Â source voltage from the EFIS.
Try removing the line to the EFIS temporarily and see if the light goes out completely when the door is closed.
Of course, I could be wrong.
Just saw Sebastian's post; as he mentioned, a diode in the EFIS sense line (pointed toward the switch) might work, as long as the diode's leakage current isn't high enough to light the LED, and its forward voltage drop isn't high enough to keep the EFIS from seeing switch closure. a Schottky diode might help that issue.
Charlie
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Well, according to 'the google', there are options. Here are one company's selections. DPDT are actually cheaper than DPST:
[url=https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-no]https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-no[/url]Â
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A DPDT is a DPST, if you ignore two of the terminals....
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gfarek(at)yahoo.com
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| Posted: Sun Nov 10, 2019 10:27 am Post subject: LEDs light mystery |
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Check Mouser 706-32-01, will it work for you? Jerry
Sent from my iPhone
| Quote: | On Nov 10, 2019, at 12:02 PM, Carlos Trigo <trigo(at)mail.telepac.pt> wrote:
Charlie
A DPDT would not suit my need, it has to be a DPST.
And I am not finding a DPST - N.O., which one is it?
Carlos
| Quote: | No dia 10/11/2019, Ã s 14:12, Charlie England <ceengland7(at)gmail.com> escreveu:

On Sun, Nov 10, 2019 at 6:35 AM Carlos Trigo <trigo(at)mail.telepac.pt (trigo(at)mail.telepac.pt)> wrote:
| Quote: | Thanks to Sebastien and to Charlie, for your answers.
I am now considering 2 separate circuits, one for the ground to command the door alarm, and the other to switch the + circuit to the lights.
Does anyone know about a DPST microswitch?
Carlos
Enviado do meu iPhone
| Quote: | No dia 09/11/2019, Ã s 22:10, Charlie England <ceengland7(at)gmail.com (ceengland7(at)gmail.com)> escreveu:
 On 11/9/2019 1:09 PM, Carlos Trigo wrote:
| Quote: |  Dear electronics wizards
I have installed, in the baggage compartment of my RV-10, a couple of these LEDs lights
<11-09255m.jpg>
I want that these lights are lit whenever the baggage door is open, like we have in our cars.
Therefore I connected the lights to the microswitch which already was used to indicate that the door is open, in one of the alarm features available in the Garmin G3X system.
This alarm feature requires that the microswitch used to indicate the open door is connected through a ground circuit, i.e, this microswitch is a N.O. one, and connects the circuit to ground whenever the baggage door is open.
So, these 2 LEDs lights are permanently connected to +, and get ground only when the microswitch is open, simultaneously when the door is open.
Now, when the baggage door is open, the lights are On, which is good.
The mystery (at least for me, as I am a bit electronics challenged) is that when the door is closed, these LEDs lights are dimmed lit...
This has an explanation, of course, but I don’t know it.
Why these LEDs lights emit some light, although down dimmed, when they have power in the red wire but no ground in the black wire?
I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire?
Thanks
Carlos
|
Do they light up with the door open if the EFIS isn't powered up? I'd bet they don't.
If they don't...
Consider that the EFIS must supply a a voltage to the microswitch (likely around 5V and very current-limited) in order to detect that the switch has closed. With the switch open (door closed), and the EFIS powered up, there's a potential difference between your 12V battery supply, and the <5V?> source voltage from the EFIS.
Try removing the line to the EFIS temporarily and see if the light goes out completely when the door is closed.
Of course, I could be wrong.
Just saw Sebastian's post; as he mentioned, a diode in the EFIS sense line (pointed toward the switch) might work, as long as the diode's leakage current isn't high enough to light the LED, and its forward voltage drop isn't high enough to keep the EFIS from seeing switch closure. a Schottky diode might help that issue.
Charlie
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Well, according to 'the google', there are options. Here are one company's selections. DPDT are actually cheaper than DPST:
[url=https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-no]https://www.newark.com/w/c/switches-relays/switches/microswitch-snap-action-switches?contact-configuration=dpdt|dpdt-no|dpst|dpst-no[/url]
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Eric Page
Joined: 15 Feb 2017
Posts: 242
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| Posted: Sun Nov 10, 2019 12:39 pm Post subject: LEDs light mystery |
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| Quote: |
Eric, I drew the circuit as I intended...
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OK Joe, I see my error now. I misinterpreted your sentence about changing the logic of the EFIS input. My brain read that as changing it from a switch-pulls-low to a switch-pulls-high condition, but you meant to invert the way the EFIS reacts to the existing switch-pulls-low input. Makes sense now.
I suppose my drawing could be a third option, if the EFIS can be configured to accept a high input to activate the door annunciation.
Anyway, lots of options. Sorry for muddying the water...
Eric
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nuckolls.bob(at)aeroelect
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| Posted: Sun Nov 10, 2019 1:38 pm Post subject: LEDs light mystery |
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| Quote: | | Quote: | | I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire? |
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Led's will produce light at VERY tiny currents. I suspect
the current present in the door-closed state is the
tiny drain presented by the EFIS input circuit.
I have an LED lamp in the ceiling of a bathroom that
will not quite go out . . . the wiring between the
controlling switch and the lamp fixture is a bundle
of multiple circuits. I'm pretty sure that I'm seeing
some CAPACITIVE coupling to the floating lead that
carries normal ON-voltage to the fixture. It's tiny
to be sure but leds aren't picky. The room has to be
totally dark to witness the effect but it's there.
In your case, you could put a multimeter in series
with the supply lead to the fixture. I suspect it's
very low and may not represent a serious performance
issue for the battery. Some cars have tiny parasitic
loads to keep things like door opening receivers
hot.
You can get rid of the dim light by simply adding
a load resistor across the fixture . . . low enough
resistance to drop voltage across the fixture to
less than 2 volts or so . . . the light will then
go out.
This will NOT make your parasitic current go away,
so you'll still need to investigate its significance
with respect to battery life.
If you want the easiest way to make it go away
then put the microswitch in the SUPPLY lead to
the baggage compartment light and then set
your efis input to active HI for DOOR
OPEN annunciation.
Bob . . .
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Sun Nov 10, 2019 2:00 pm Post subject: LEDs light mystery |
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| Quote: | | Quote: | | I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire? |
|
Led's will produce light at VERY tiny currents. I suspect
the current present in the door-closed state is the
tiny drain presented by the EFIS input circuit.
I have an LED lamp in the ceiling of a bathroom that
will not quite go out . . . the wiring between the
controlling switch and the lamp fixture is a bundle
of multiple circuits. I'm pretty sure that I'm seeing
some CAPACITIVE coupling to the floating lead that
carries normal ON-voltage to the fixture. It's tiny
to be sure but leds aren't picky. The room has to be
totally dark to witness the effect but it's there.
In your case, you could put a multimeter in series
with the supply lead to the fixture. I suspect it's
very low and may not represent a serious performance
issue for the battery. Some cars have tiny parasitic
loads to keep things like door opening receivers
hot.
You can get rid of the dim light by simply adding
a load resistor across the fixture . . . low enough
resistance to drop voltage across the fixture to
less than 2 volts or so . . . the light will then
go out.
This will NOT make your parasitic current go away,
so you'll still need to investigate its significance
with respect to battery life.
If you want the easiest way to make it go away
then put the microswitch in the SUPPLY lead to
the baggage compartment light and then set
your efis input to active HI for DOOR
OPEN annunciation.
Bob . . .
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Sun Nov 10, 2019 4:20 pm Post subject: LEDs light mystery |
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| Quote: | | Quote: | | I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire? |
|
Led's will produce light at VERY tiny currents. I suspect
the current present in the door-closed state is the
tiny drain presented by the EFIS input circuit.
I have an LED lamp in the ceiling of a bathroom that
will not quite go out . . . the wiring between the
controlling switch and the lamp fixture is a bundle
of multiple circuits. I'm pretty sure that I'm seeing
some CAPACITIVE coupling to the floating lead that
carries normal ON-voltage to the fixture. It's tiny
to be sure but leds aren't picky. The room has to be
totally dark to witness the effect but it's there.
In your case, you could put a multimeter in series
with the supply lead to the fixture. I suspect it's
very low and may not represent a serious performance
issue for the battery. Some cars have tiny parasitic
loads to keep things like door opening receivers
hot.
You can get rid of the dim light by simply adding
a load resistor across the fixture . . . low enough
resistance to drop voltage across the fixture to
less than 2 volts or so . . . the light will then
go out.
This will NOT make your parasitic current go away,
so you'll still need to investigate its significance
with respect to battery life.
If you want the easiest way to make it go away
then put the microswitch in the SUPPLY lead to
the baggage compartment light and then set
your efis input to active HI for DOOR
OPEN annunciation.
Bob . . .
| | - The Matronics AeroElectric-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
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nuckolls.bob(at)aeroelect
Guest
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| Posted: Sun Nov 10, 2019 5:18 pm Post subject: LEDs light mystery |
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| Quote: | | Quote: | | I suppose that this dimmed light represents some battery power consumption, so, is there a solution for my problem? Any diode to be put in the ground wire? |
|
Led's will produce light at VERY tiny currents. I suspect
the current present in the door-closed state is the
tiny drain presented by the EFIS input circuit.
I have an LED lamp in the ceiling of a bathroom that
will not quite go out . . . the wiring between the
controlling switch and the lamp fixture is a bundle
of multiple circuits. I'm pretty sure that I'm seeing
some CAPACITIVE coupling to the floating lead that
carries normal ON-voltage to the fixture. It's tiny
to be sure but leds aren't picky. The room has to be
totally dark to witness the effect but it's there.
In your case, you could put a multimeter in series
with the supply lead to the fixture. I suspect it's
very low and may not represent a serious performance
issue for the battery. Some cars have tiny parasitic
loads to keep things like door opening receivers
hot.
You can get rid of the dim light by simply adding
a load resistor across the fixture . . . low enough
resistance to drop voltage across the fixture to
less than 2 volts or so . . . the light will then
go out.
This will NOT make your parasitic current go away,
so you'll still need to investigate its significance
with respect to battery life.
If you want the easiest way to make it go away
then put the microswitch in the SUPPLY lead to
the baggage compartment light and then set
your efis input to active HI for DOOR
OPEN annunciation.
Bob . . .
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