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LED route indication - Electrics - DCC - Getting You Started. - Your Model Railway Club
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 Posted: Fri Nov 29th, 2019 02:28 pm
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Petermac
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I'm running DCC, all Peco Electrofrog points.

I have a new section of baseboards carrying my storage roads - 2 in each direction (up line and down line) with crossovers mid way thus allowing either 2 short trains or 1 long to be stored on each road. The 3rd track on each side is the through route.  i.e. I have 6 tracks in total - 3 "up" and 3 "down".

As the whole of this area will be covered by a high level board, I want to build a mimic panel using LED's to show which route is set.

Ideally, I'd like to use my Lenz LS150's to control the Tortoise point motors.  Tabs 1; 2; 3; 4 and 8 will be used for the motor and frog polarity.  This leaves the other internal switch (tabs 5; 6 and 7) for the LED route indicators.

I've watched videos etc. of Tortoise/LED route indication until I look like a tortoise but they all seem to use DPDT switches and bi-colour LED's.

Is it not possible to use this spare internal switch to power the LED's directly - i.e. without the DPDT switch and furthermore, could I light up just 1 green LED showing which route is set ?  By that, I mean both the through track and the turn has a single green LED on the panel and, depending on which way the Tortoise is set, one or the other lights up ?  It's obvious to me that, if the "open" route is showing green, the other would be unavailable (red) without actually having to signal it as thus.

It could be that, as with the frog tab "4", only tab "7" is available for output, in which case, only one green LED could be wired.  Bi-colour ones, used in pairs, would presumably show either red or green depending on which way the current ran through them .................. :hmm

A final question - for now anyway - I've read that, if powered through the Tortoise switch, the LED's don't need a resistor because the Tortoise already acts as one.  Is this true ?

Sorry it's so long winded but I'm not at home and am slightly bored not being able to get at the actual layout ...........



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 Posted: Fri Nov 29th, 2019 10:06 pm
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Sol
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Petermac wrote:

Ideally, I'd like to use my Lenz LS150's to control the Tortoise point motors.  Tabs 1; 2; 3; 4 and 8 will be used for the motor and frog polarity.  This leaves the other internal switch (tabs 5; 6 and 7) for the LED route indicators.  Yep, go for that - both internal switches are SPDT completely separate from each other

I've watched videos etc. of Tortoise/LED route indication until I look like a tortoise but they all seem to use DPDT switches and bi-colour LED's. Bi-colour LEDs can be either 3 legged switched via SPDT  or 2 legs switched via DPDT

Is it not possible to use this spare internal switch to power the LED's directly - i.e. without the DPDT switch and furthermore, could I light up just 1 green LED showing which route is set ?  By that, I mean both the through track and the turn has a single green LED on the panel and, depending on which way the Tortoise is set, one or the other lights up ?  It's obvious to me that, if the "open" route is showing green, the other would be unavailable (red) without actually having to signal it as thus.  Yep

It could be that, as with the frog tab "4", only tab "7" is available for output, in which case, only one green LED could be wired.  Bi-colour ones, used in pairs, would presumably show either red or green depending on which way the current ran through them .................. :hmm

A final question - for now anyway - I've read that, if powered through the Tortoise switch, the LED's don't need a resistor because the Tortoise already acts as one.  Is this true ?  Yep  as per instructions that come with the Tortoise



Now I am away soon for the day but later i will do some drawings and post them here but this site has lotsa info
https://brian-lambert.co.uk/Electrical_Page_3.html



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Ron
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 Posted: Fri Nov 29th, 2019 10:24 pm
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Sol
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My photos:
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And a few links etc in the YMR index



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Ron
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 Posted: Sat Nov 30th, 2019 06:11 am
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Sol
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My photos:
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Some simple drawings. The 3 leg Bi-colour voltage  -  & + depends on the type of common leg ,  anode or cathode

the scribble on the LHS toggle is DPDT



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Ron
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 Posted: Sat Nov 30th, 2019 08:54 am
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Petermac
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Many thanks indeed Sol - being our electronics wizard, I knew you'd come up with the goodies !!

I'll check out the index and also have a good read of Brian Lambert - if only to see how quickly I get lost ............... :roll: :roll:



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 Posted: Fri Dec 6th, 2019 09:24 pm
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Sol
A modelling Moderator.


Joined: Mon Nov 28th, 2011
Location: Evanston Gardens, South Aust, Australia
Posts: 3978
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My photos:
view photos in Gallery
view photos as slides

And for some - this may help re LEDs

https://www.dccconcepts.com/manual/leds-and-how-to-get-the-best-from-them/



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Ron
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