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Unread 26-04-2004, 18:13
Ben.V.293 Ben.V.293 is offline
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Re: remotely controlling 15 relays

Quote:
Originally Posted by Greg McCoy
Be careful!!!

Your application is potentially dangerous, wired or wireless. If you decide to use a wireless system, you must be especially confident that it will only trigger when desired, and not from noise or other strange occurances

Make sure that what you are doing is legal and safe. It might be a good idea to look into systems that are already designed for this type of application. Whatever you do, make sure that you don't have rockets/explosives going off when you don't want them to.
Thank you for the advice. Safety is my biggest concern and it is also the reason i built this system. I never felt safe lighting fuses and then scurying off to safety. I have many safety features built into it such as a key switch so only i can use it, diodes to make sure the electricity only goes where its supposed to, and as another safety feature i wired it so that 2 switches must be pushed to ignite any one rocket. I had not thought of the wireless system going off from interfearance or signals from another source. Thanks for pointing that out. I'll have to do some research.

Ben Van Selous
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Unread 27-04-2004, 07:50
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Re: remotely controlling 15 relays

Ben,
I have to go along with Greg here. Wireless ignition systems are notorious for false triggers unless the system is very sophisticated and uses a data stream with error checking for ignition. Most of the systems I have seen are as you describe, wired with key lock and dual arm switches. This is the type of system used by Hollywood special effects guys and fireworks operators.
The KB9WTE at the bottom of Greg's signature is a good sign he knows wherefore he speaks on wireless.
Al, WB9UVJ
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Unread 27-04-2004, 08:24
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Re: remotely controlling 15 relays

Quote:
The KB9WTE at the bottom of Greg's signature is a good sign he knows wherefore he speaks on wireless.
What is that? I am inclined to think it has something to do with ham radios but I really don't know.
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Unread 27-04-2004, 09:16
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Re: remotely controlling 15 relays

Quote:
Originally Posted by Adam Y.
What is that? I am inclined to think it has something to do with ham radios but I really don't know.
Adam,
You are correct, it is an indication he (and I) are licensed hams.
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Unread 27-04-2004, 12:34
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Re: remotely controlling 15 relays

Quote:
Originally Posted by Adam Y.
What is that? I am inclined to think it has something to do with ham radios but I really don't know.
If you're interested, here's more information on amateur/ham radio:

http://www.arrl.org/hamradio.html
http://www.dxing.com/whatham.htm
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Unread 27-04-2004, 15:18
Ben.V.293 Ben.V.293 is offline
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Re: remotely controlling 15 relays

Because of the safety hazards i've decided not to go with wireless ignition. Thanks for pointing out the dangers of it. I'll just run wires like i did in my prototype. Thanks for the help everyone.

Ben Van Selous
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Unread 22-11-2004, 19:14
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Re: remotely controlling 15 relays

Good choice!
There was something else Al and Ben missed. A radio sends out radio frequecies, and a reciver puts out PWM, which is ineffecient for triggering relays. That throws a monkey wrench into the works!

Sparks
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Unread 24-11-2004, 21:38
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Re: remotely controlling 15 relays

interesting project. I've actually built a model rocket launcher that can launch up to 8 rockets at the same time either manually or after a preset time. This project is posted on my website: www.personal.psu.edu/sdl162.
I have recently obtained a plc (programmable logic controller) and am in the process of programming it to launch model rockets. as for wireless you could use one laptop(remote) wirelessly connected through adhoc mode to your control panel laptop (master). u connect the remote pc using its parallel port and some programming, to remotely launch the rockets. u should be able to do upto 8 this way. u connect a 5v relay to each of the parallel port outputs of the remote pc. then u connect your input switches to the parallel port of your master pc. i'm in the process of setting a simular system up to remotely control the observatory dome on campus. hope this is of some help.
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Unread 24-11-2004, 22:29
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Re: remotely controlling 15 relays

Scott,
As I have said it before and I think it needs restating now. Safety is a number one concern when doing remote control and the fact that it is model rockets or the real thing, some form of absolute cutoff needs to be included. You need to know for sure that when you connect the wires to the ignitor, there is no way for you or anyone else to have triggered that output and allowed you to launch with your face over the rocket. I have seen numerous "failsafe" designs fail under unexpected conditions.
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