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HelicopterOff Topics › Calling out for some help from you electrical engineers.
08-02-2011 03:15 AM  6 years agoPost 1
Tom Wrobleski

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Wyoming Michigan

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I fly with a RC show team here in west Michigan. We do around three or four shows a year for different groups for free. I am in the process of taking over the entire show and running it. During out show we set of charges something like a M-80 we use an electronic match to set them off. The problem is that our set up for setting off the charges is unreliable and prone to interference. Right now we are using little hand held walkie talkies transmitting tone signals from a key pad to set off the charges.

What I am looking to build is something that is more secure possible on 2.4. All I need it to do is turn something on and off. The idea would be to have the transmitter with a arming switch and a fire button. I also would like to be able to switch around 20 thing on separately.

Is this possible? How complicated would it be.
Any help would be greatly appreciated.

Tom W. Aero batts show team.

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08-02-2011 03:22 AM  6 years agoPost 2
B.T.D.T.

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NY

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08-02-2011 03:46 AM  6 years agoPost 3
Tom Wrobleski

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Wyoming Michigan

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Switching is not the real problem. The problem I have right now is how to transmit the signal about 200' to the control box then I can use multiple switches or relays to set off the charges. First I need to figure out how to remotely do it.

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08-02-2011 04:02 AM  6 years agoPost 4
B.T.D.T.

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NY

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??

Use your radio transmitter and a receiver with those relays that plugs into your receiver. You flip the switches on your transmitter to active the receiver to trigger the relay to the assign channels.

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08-03-2011 01:28 AM  6 years agoPost 5
rcjon

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Macon, GA

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And when a couple of black Suburbans pull up at your house, be sure you have all this gear available for the guys in the Ray Bans to look over.

Ask your doctor if your heart is healthy enough for Radio Control Helicoptering.

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08-03-2011 02:15 AM  6 years agoPost 6
Tom Wrobleski

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Wyoming Michigan

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I need my radio to fly during the show. I do not want to purchase two 10 channel radio to do this. There has to be a way to build a transmitter and a receiver to do this. If 20 channels is to much for one setup I could build two transmitters and split it up. They do not have to be proportional just a simple on and off.

I was thinking using something similar to a garage door opener. They have a bank of switches that you sinc with your remote in your car. The only thing is I need 20 remotes and 20 receivers.

It seems simple but hard to explain. Key note is I do not want to use a Heli or airplane transmitter.

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08-03-2011 12:30 PM  6 years agoPost 7
Peter Wales

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Orlando Fl

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You need a local electronics whizz kid!

There are plenty of transmitters and receivers available which will provide a signal on demand such as driveway alarm sensors or garage door openers, although I would prefer something like a cheap 2.4GHz RC unit for signal integrity. You don't want someone else setting off the show.

The part you seek is called a shift register and is an electronic chip which outputs a signal to a different pin every time a pulse is fed into it. They are usually 8 outputs, but can be cascaded in units of 8 so you can have an infinite number of sequential relays being switched on and off every time you press a button on the transmitter.

Peter Wales
http://scalehelicopters.org

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08-03-2011 04:27 PM  6 years agoPost 8
AirWolfRC

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42½ N, 83½ W

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It sounds like what you have should be quite workable. Just needs a going over to fix the problem areas. Can you give more details on what you already have ?

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08-04-2011 02:52 AM  6 years agoPost 9
Tom Wrobleski

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Wyoming Michigan

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What we have now is a key pad like your phone has. It sends a tone from the key pad over the walkie talkie to the other walkie talkie which goes into our control box to our various charges. Here is the problem at our last show we did at Camp Whitetail for about 1500 boys and there mentors, when we powered up our system after all the people arrived our charges started going off. We think that it was caused from all the walkie talkies that the campers had on with them.
I am trying to come up with a more secure system so this would never happen again. If somebody was near them when they went off it may have not been a good day. Also by using a key pad you have to remember which number yo pushed. If I have a row of switches that you just flip you know what charges have been set off and if one did not go off you would know what one it was and clear it before anybody goes near it.
The system we have now is old and the person who build it says nothing is wrong with it and is quitting the show team. We have had other minor problems over the years with this system. I'm just looking to up date it and make it safer.

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08-04-2011 03:53 AM  6 years agoPost 10
03fomoco

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Tucson AZ

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10 ch

http://www.abacom-tech.com/%2F10-Re...R8D-P93492.aspx

TX is listed in description. Didnt really price shop but this gives you idea what to look for.

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08-04-2011 05:32 PM  6 years agoPost 11
AirWolfRC

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42½ N, 83½ W

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Looks like abacom-tech.com has just what you need.

In a nut-shell, you're looking for some kind of Input/Output controller with a radio link.

If you can run a single data cable from your position to the pyros, you can find some hardware here http://www.opto22.com

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08-04-2011 06:09 PM  6 years agoPost 12
GyroFreak

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Orlando Florida ...28N 81W

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Looks like it would be cheaper and simpler to buy some cheap DSM2 transmitters and receivers. They should be very reliable and jam proof for your application. With model match very unlikely to accidently set off charges.

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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08-04-2011 08:27 PM  6 years agoPost 13
ssmith512

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Indianapolis, IN USA

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Setting off pyrotechnics wirelessly is never a good idea. A few thousand feet of cable to make a hard wired system surely would be an inexpensive alternative, and you would have piece of mind of a (relatively) secure system.

Just a thought.

Steve

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08-04-2011 09:19 PM  6 years agoPost 14
Peter Wales

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Orlando Fl

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If you are going to go that way, I would buy a couple of these

http://www.hobbyking.com/hobbyking/...CFYoP2godx0vQ6g

Peter Wales
http://scalehelicopters.org

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08-05-2011 12:01 AM  6 years agoPost 15
03fomoco

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Tucson AZ

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...

I see a huge problem using an RC radio, at least 5 of the chanels are proportional and do not have positive on off features, i.e. sticks and flaps. So that only leaves you with 4. Then the issues with what state the RX is in when no TX signal is present on initial on or when going to failsafe.

Please see my post above and also look into remote lighting controls for stadiums and events...

With that said:

What if it don't work? Who is going near it? You said M-80's, I kinda doubt that because at more than 50 feet they are boring. I have done some dumb stuff and I got two suggestions...

1. Ribbon cable and relays are cheap!

2. Cannon fuse can be had in any length and burn rate you want!

In the current mindset and technical knowledge of this country I would be very cautious of anything remotely detonated. Logic does not apply with issues like this.

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08-05-2011 01:59 AM  6 years agoPost 16
Peter Wales

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Orlando Fl

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All of the channels can be made to switch a relay whether they are switched or on a stick. Just set the end points and use one of those RC switches readily available. Just take the centering springs off the sticks and put them into the appropriate corner. Personally I would replace them with a switch and resistors, but the OP may not be able to get this done.

Safety is done by wiring a LED across the relay to show whether or not it is energized. Once the radio links is established and all the LEDS are off, you then switch on the power to the things which go bang, and not until the link is established and everyone is out of the area.

Peter Wales
http://scalehelicopters.org

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08-05-2011 03:34 AM  6 years agoPost 17
Tom Wrobleski

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Wyoming Michigan

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Thanks 30fomoco that looks like something that might work. I will do some more research of that system and let everybody know.

The reason we use remote is at one time we use to do it all by wires running across the runway. The problem with that is planes would snag the wires with there tail wheels and get hung up in them. Using the remote solved that problem.

The whole show we do is kept up to par we have a guy that is licensed to handle the charges. He makes them his self. The ATF comes out and inspects the operation. So no this is not something that is just thrown together its well thought out and safety is a must.

Keep the input coming guys it all helps. I will keep you posted on what I find.
Tom W.

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HelicopterOff Topics › Calling out for some help from you electrical engineers.
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