---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 11/09/19: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 05:46 AM - A List Contribution - It's Your Personal Squelch Button... (Matt Dralle) 1. 11:11 AM - LEDs light mystery (Carlos Trigo) 2. 11:26 AM - Re: LEDs light mystery (Sebastien) 3. 01:59 PM - Re: LEDs light mystery (Charlie England) 4. 03:35 PM - Pilgrimage to AeroMeca . . . (Robert L. Nuckolls, III) ________________________________ Message 0 _____________________________________ Time: 05:46:47 AM PST US From: Matt Dralle Subject: AeroElectric-List: A List Contribution - It's Your Personal Squelch Button... There is an automatic "squelch button" of sorts for the Fund Raiser messages. Here's how it works... 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The system keys on the given email address and since most of these are anonymous public access methods, there is no simple way to filter them.] ________________________________ Message 1 _____________________________________ Time: 11:11:52 AM PST US From: Carlos Trigo Subject: AeroElectric-List: LEDs light mystery =EF=BB =EF=BBDear electronics wizards I have installed, in the baggage compartment of my RV-10, a couple of these L EDs lights I want that these lights are lit whenever the baggage door is open, like we h ave in our cars. Therefore I connected the lights to the microswitch which already was used t o indicate that the door is open, in one of the alarm features available in t he Garmin G3X system. This alarm feature requires that the microswitch used to indicate the open d oor is connected through a ground circuit, i.e, this microswitch is a N.O. o ne, 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 w hen 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 w hen the door is closed, these LEDs lights are dimmed lit... This has an explanation, of course, but I don=99t know it. Why these LEDs lights emit some light, although down dimmed, when they have p ower in the red wire but no ground in the black wire? I suppose that this dimmed light represents some battery power consumption, s o, is there a solution for my problem? Any diode to be put in the ground wir e? Thanks Carlos ________________________________ Message 2 _____________________________________ Time: 11:26:48 AM PST US From: Sebastien Subject: Re: AeroElectric-List: LEDs light mystery 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 wrote: > =EF=BB > =EF=BBDear 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 use d > 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 ope n > 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=99t 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 > > ________________________________ Message 3 _____________________________________ Time: 01:59:09 PM PST US Subject: Re: AeroElectric-List: LEDs light mystery From: Charlie England 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 > > > 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 dont 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 ________________________________ Message 4 _____________________________________ Time: 03:35:44 PM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Pilgrimage to AeroMeca . . . Dr. Dee and I pulled into the drive about an hour ago. After 26 hours of asphalt mania and an amazing and humbling two hours at the EAA Museum, we're home in good stead. The barely teenaged grandson seems to have behaved himself reasonably. No smoking ruins . . . no cop cars out front when we drove up. Got snowed on in OSH but it's 66 degrees and sunshine in cow town. Over all, wouldn't have missed it were it twice the effort. I'll update you all . . . tomorrow when the center-line-glaze has cleared . . . 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