oscillators

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billr

New Member
Hi ALL, need all the help and suggestions I can get. Looking for a device I can make or buy, I thought maybe oscillator circuit.Need to transmit and recieve 60 miles away.

Nigel Goodwin

Super Moderator
You've given FAR too little information, and it's almost certainly not possible without a licence - for anywhere near that distance.

billr

New Member
Nedd to monitor a door open or closed and I didnt know about the lisence crap. Any other suggestions?

Nigel Goodwin

Super Moderator
Nedd to monitor a door open or closed and I didnt know about the lisence crap. Any other suggestions?
Use a mobile phone to send a text message when the door is opened.

billr

New Member
Your talking to an idiot Nigel pls explain how

billr

New Member
I am just looking for an inexpensive way to monitor my cabin in the mnts. It has no electric so I doubt a cell phone would last long.

Nigel Goodwin

Super Moderator
Your talking to an idiot Nigel pls explain how
You need an interface that detects the door has opened, and instructs the mobile phone to send a text message. Mobile phones usually have an interface port on them that you can connect to, in order to make them do things like this. The interface needs a micro-controller that needs programming in order to do all the work, and supply the message to the phone.

It's not terribly trivial, and depends entirely on the specific phone, Nokia ones seem to be most popular for this. There have been projects in various electronics magazines about doing it.

billr

New Member
Is this all possible with a battery?

krich

New Member
I am just looking for an inexpensive way to monitor my cabin in the mnts. It has no electric so I doubt a cell phone would last long.
This is not going to be inexpensive. I've seen cellular modules available at Sparkfun and they're ~$100 IIRC. That's not to mention the monthly cell service fee you'll have to buy from a cellular carrier. But that's really putting the cart before the horse. You can't do anything without some sort of renewable power source. I'm guessing we're talking about solar or wind power stored in batteries at this point, but you tell us. Is it windy out there? Is it sunny? If you're worried about vandals entering the cabin, consider the possibility that they'll steal/destroy/disable your$500 (or whatever) sensor.

Nigel Goodwin

Super Moderator
Is this all possible with a battery?
Depends how long you want it to last, but it's certainly possible.

blueroomelectronics

Well-Known Member
Cheaper just to insure the cabin.

Nigel Goodwin

Super Moderator
What use is it to know your cabin 60 miles away has been broken in to?, it's not like you can get there in a few minutes.

billr

New Member
but someone else can

billr

New Member
i guess i am just looking for a quick and inexpensive way
sorry to bother you all ty

tcmtech

Banned
Just put a sign on the inner door that states this.

Hidden video surveillance equipment in use.

videoed and sent to an off site recording system!
(Thanks for standing still!)

billr

New Member
well ty all

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