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Radio - Servo - Gyro - Gov - Batt > Help from electronic guru's out there ??

tris_heli
Key Veteran
Location: Lidlington, Bedfordshire, UK

Hi all,

I am in need of putting together a simple "state full" switch to function on a scale heli.

Basically we've ran out of channels on the radio and i need to switch a cockpit heli sound module on and off. This will obviously only be for static use only and ive got a simple micro switch installed to switch this on and off.

The problem is that this switch is off when not pressed, and on when pressed. After much looking i couldn't find a "state full" switch small enough which remained on when pressed until pressed again.

So, does anyone know of a simple circuit that would allow me to switch the sound module on and off by pulses from this microswitch ?

Cheers
Tris

08-09-2008 10:38 PM

HOMEPAGE

Heli 770
Elite Veteran
Location: Lemon Grove, Ca. USA.

I've got a micro switch with 3 leads out the bottom and depending how you hook it up close circuit can be with the arm up or down. Is that what your looking for?

08-10-2008 12:07 AM

copperclad
Elite Veteran
Location: ..

hi Tris
there are a couple of ways to go with what you want to do

you can buy what's called a push on / push off switch http://www.goldmine-elec-products.c...p?number=G14861

push it once , it is on and it stays on until you push it again

or you could build a circuit with a few IC's and a power transistor

i am thinking it would be easiest to just use a push on / push off switch from maplins

http://www.maplin.co.uk/Search.aspx...&source=15&SD=Y

and this last thing i found on maplin's is an electronic switch that is triggered with a momentary switch like you have now and stays on for an adjustable ( 1 sec ~ 15 minutes ) time period
http://www.maplin.co.uk/module.aspx...220009&doy=10m8

HTH , dana

08-10-2008 02:12 AM

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tris_heli
Key Veteran
Location: Lidlington, Bedfordshire, UK

Hi Copperclad,

Thanks for the info

The issue is that i want to hide, or incorporate the switch into a scale dash board. This means that i havn't got room for a standard push on / push off switch...

There's barely room for a sub micro switch actually.

But that 555 timer/Relay circuit looks good, although it states that it needs a 12v feed (i only have 7.2/2s lipo on board).

Would you think it would be ok running on the lower voltage or do i need to look at something else ?

Cheers
Tris

08-10-2008 10:08 AM

HOMEPAGE

copperclad
Elite Veteran
Location: ..

hi Tris

they have a download page for the diagram , and it shows they are using a 12volt relay , i know the 555 will run at lower voltages so i believe it is the relay that needs the higher voltage to function , one option would be to trade the relay out for one with the same footprint and a lower voltage , say 6 volts , maplin carries some , but i am not sure they have the same footprint to make them drop-in replacements to the stock relay in the kit

can you build a circuit if i supply a diagram , it would be fairly easy to design a circuit to turn on with a momentary signal and stay on till a second signal is sent , and run on your voltage , this would let you use the micro switch you have now , and would turn on and stay on with one press of the switch and then turn off and stay off with the next press of the switch

i would be glad to help , dana

does the micro switch you have now , have two or three contacts out the back ?

08-10-2008 02:58 PM

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AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

coperclad's reference http://www.maplin.co.uk/images/100/n91ap.jpg is about as small as you're going to get for a push-on/push-off switch. It's maybe 1/2" across.

If you want to use a simple push-on momentary switch (smaller yet), look into a made up circuit using a JK or T flip-flop to get your over all push-on/push-off operation. You may need a debounce circuit on the momentary switch.

Why does a sound switch have to be mounted in the cocpit ? Why not on the underside ?

08-10-2008 04:08 PM

HOMEPAGE

tris_heli
Key Veteran
Location: Lidlington, Bedfordshire, UK

Firstly thanks for all the help with this, really appreciated.

Copperclad - yes regarding building from circuit diagrams.

You see this is where its going to get a little complicated

. This all stems from the building of an EC135 (here's the thread - http://www.runryder.com/helicopter/t424802p7/).

We just haven't got enough channels to do everything that we wanted to do (well, not until the 12x is released over this side of the pond anyway).

There's two things that i need to get sorted, one regarding this cockpit sound switch and another for the Nav lights.

The lights are a little different though in that they normally need to be connected to a RX channel like in the diagram below

AirwolfRC- I am trying to hide the switch's behind actual scale switch's on the middle console panel (didn't want them to show). In order to get the scale, i was thinking about using some of these 2 pole tactile switches.

So, i was thinking about using a 555 timer to toggle (as the switch for the lights only needs to toggle) between 1ms and 2ms pules (giving -100 to +100 ATV), with 1ms being when the switch isn't pressed.

Copperclad, would it be possible to combine the two functions into a 556 (ie 2 555's in one IC) ? Ive got an un regulated 7.2v feed spare that i was hoping to use.

I know it would be asking a lot but a circuit diagram for these two functions would be greatly, greatly appreciated

Cheers
Tris

08-10-2008 05:35 PM

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AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

So you're going to reach in the cocpit to switch the sound on/off ?

I have seen, but don't know the source, of a add-on system for your TX/RX that takes two channels and can control 8 on/off devices independently. I saw it in use on a 15ft scale battle ship.

If you want to get fancy, you could always come up with your own scheme using only one channel to control 8 on/off devices. If you are interested, let me know and I can give you the details.

08-10-2008 05:49 PM

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Mark D
Heliman
Location: The Earth

Check out this link, it may be a answer to your problems
its a JR channel expander that gives you up to 4 extra servo channels from one RX channel.

http://www.horizonhobby.com/Product...?ProdID=JRPA905

This way you can use micro switches or solid state switches.

Mark

08-10-2008 06:53 PM

copperclad
Elite Veteran
Location: ..

hi
i was thinking along the same lines as airwolf with a debounced switch that would toggle a flip flop , this would involve building a small circuit , but you could turn your sound on or off with the small momentary switch you have now

if you have a single channel free you could use it to control both the lights and the sound remotely , as in full left would toggle lights , on or off , and full right would toggle sound on or off , and center would leave both circuits in their current state , this would be a more involved circuit

maplins also carries latching relays , but you would need two micro switches like you have now to control sound on and off , one momentary switch would turn the sound on and the other momentary switch would turn the sound off

there are a lot of options , and it is hard to say what would be the best fit for your aplication , dana

08-10-2008 07:08 PM

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AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

Quote
if you have a single channel free you could use it to control both the lights and the sound remotely , as in full left would toggle lights , on or off , and full right would toggle sound on or off , and center would leave both circuits in their current state , this would be a more involved circuit

Or use a servo to operate two separate push-on/push-off switches.
- - - no circuit building.

08-10-2008 07:16 PM

HOMEPAGE

copperclad
Elite Veteran
Location: ..

hi airwolf
that sounds like the best and easiest so far , good work , dana

08-10-2008 07:32 PM

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tris_heli
Key Veteran
Location: Lidlington, Bedfordshire, UK

Hi All,

Unfortunately there's not a single channel spare

But then the thing does have 3 gyro's onboard, ECU's, mixers, 4 lipo's ect ect (you have no idea of the amount of wiring that's under the cockpit floors !!!!

)

But no, its not a problem reaching in to the cockpit to turn the sounds / nav lights on - in fact the sounds are only really for static judging anyway.

The idea is to have the Nav lights and Cockpit Sounds running off a separate lipo / circuit from the flight and ECU systems, allowing them to be operated without the need of the TX.

So, i like the idea of having two internal "push" switch's, one controlling a 555 timer to mimic the toggling switch function (1 to 2ms) and another controlling a relay to turn on the cockpit sounds.

Is this possible ?

08-10-2008 08:15 PM

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AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

You're not going to get a 555 to act as a toggle function, a one shot timer maybe but not a toggle.

If you want toggle, like I said earlier, use a JK flip-flop.

And you don't need relays, you can use a simple transistor.

After 45 years in electronics, I think I know what I'm talking about.

08-10-2008 08:27 PM

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Nightstalker
Elite Veteran
Location: UK (BEDFORDSHIRE)

tris_heli go to Maplins in bedford they do them small switches your looking for, I have used some of these small switches for an item i use to wright words in the sky, think will work perfect for what you need, so get down there and have a look mate

08-10-2008 09:56 PM

tris_heli
Key Veteran
Location: Lidlington, Bedfordshire, UK

Hi AirWolfRC

Sorry, think we're getting crossed wires here

(no pun intended !). By Toggling, i mean toggling of the RC gear switch on the TX. The input of the Nav Light module is expecting a "signal" from the RX which i am looking at re-creating using the 555.

Steve - hi mate, long time no see. Yes been there already although at the scale i need the only switch's that i can find are the ones in the earlier picture.....

08-10-2008 10:04 PM

HOMEPAGE

Nightstalker
Elite Veteran
Location: UK (BEDFORDSHIRE)

Ok let me get this right ur looking for a very small switch that you can use that u push once for on and again for off??? and needs to be small

08-10-2008 10:32 PM

AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

If you want to simulate the servo signal that normaly comes from the RX, then just get a servo tester/exerciser and plug it in.
http://www3.towerhobbies.com/cgi-bi...?&I=LXVK79&P=FR
http://www.toyrc.com/esky-servo-adj...907-p-1087.html
- - - and others - - -

Or google "servo tester" and make your own.

08-10-2008 10:36 PM

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AirWolfRC
rrProfessor
Location: 42½ N, 83½ W

The part I don't like about trying to help people on a group is you usually don't get the necessary details to give a useful answer

08-10-2008 10:39 PM

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tris_heli
Key Veteran
Location: Lidlington, Bedfordshire, UK

I am sorry AirwolfRC - i thought i was being very detailed in my question. It also doesn't help people coming forward with questions too when people take that tone.

Quote
If you want to simulate the servo signal that normaly comes from the RX, then just get a servo tester/exerciser and plug it in.

With regards to the use of servo testers, if you read my question i need something to interface behind a switch which is located in a scale console. Thats a little difficult to achieve with your suggestion.

Anyway big thanks to Copperclad - First rate. Ive now got an idea to go away with and experiment a little.

Cheers
Tris

08-10-2008 11:05 PM

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