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- Let There Be ... LIGHT ! -
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 Posted: Sun Mar 28th, 2010 08:04 pm
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Toeffelholm
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Hi,


After controlling the locos with my chosen ESCs works excellent now,
I turn myself to the question of operating functions from my transmitter like switching front & rear light on & off.


There are several electronic RC-switches available (I have only looked here in Germany).
While an ESC controls motor speed analogous to the transmitter stick movement,
such a RC-switch controls the switching status (on/off) of a lamp, a relay etc.
activated by the end-positions of a transmitter stick or a toggle switch on your transmitter.


I have bought a "Multi 2-channel switch" from Sol-Expert

http://store.sol-expert-group.de/product_info.php?language=en&products_id=565

Size is only 14.5 x 9.5 x 2.5 mm


The name '2-Channel switch' is a bit confusing,
as you need only one channel to operate two switching functions on the board.

With two (real real tiny) soldering bridges on the backside.





You can choose if the two functions shall work as memory switch or momentary switch.


After wires and plugs are soldered to the board, it is plugged to a free channel on the receiver and connected to the front-lamps and rear-lamps of the loco.


( Here on a friends loco, that I have equipped with RC for him )








For the first I have chosen the memory-function.
You push the stick to the end-position, light is on,
you push it a second time light is off,
Like you see here


http://video.web.de/watch/7432042


You have to believe me, that the rear side lights by pushing the stick in the other direction :)


Juergen



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modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Mon Mar 29th, 2010 11:01 am
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Toeffelholm
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I forgot to say,
that this RC-switch can be supplied with max. 5,5V,
and thus also the output voltage is max. 5,5V.


In the loco in the shown example I have used an ESC with an integrated BEC ( Battery Eliminator Circuit )


That means that the receiver is supplied by the ESC with a reduced voltage of 5V,
while the voltage of the battery, directly connected with the ESC, is (in this case) 7,4V.


Some receivers don't like a voltage above 6V.
The receiver itself feeds the RC switch ( or a servo etc.) with power & the control signal.


Perhaps you find a better explanation here :-

http://www.stefanv.com/electronics/qf200312.html


If your ESC hasn't got a BEC, like the ESCs from Sol-Expert,
the voltage from the battery has to be reduced with an extra voltage regulator.


Juergen 



____________________
modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Mon Mar 29th, 2010 02:46 pm
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Herb Kephart
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Good point about the voltage Juergen !

Quite a few of the newer receivers have a built-in BEC,
but the prehistoric ones that Woodie and I use don't.

The link is an excellent one, even though we don't design circuits,
it helps to understand how they interact

Tell Theodor to stop chewing the antenna wires
it cuts down on range.


Herb  :old dude:



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Fix it again, Mr Gates--it still works!"
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 Posted: Sat Apr 3rd, 2010 07:53 am
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Toeffelholm
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Hi Herb,


As soon s Theodor found that the wires are nothing to eat, he went away to take a shower.





For the Spektrum receivers that I use,
I wouldn't need a BEC, because they have a wide voltage range between 3,5V - 9,6V,
and I use  mainly 7,4V Lipo power in my models.
But in this case it is useful for the RC-switch.


Indeed this RC-switch it is not a real "switch" but two voltage sources you can separately activate from your transmitter.
Thus, using this "switch" for activating sound functions on a sound-module ( instead of a reed-switch )
you will need an additional relay that connects the corresponding output of the sound-module with "ground".


Juergen




____________________
modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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