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/diy/ - Do-It-Yourself

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dear /diy/,Today I was talking...
Anonymous 04/17/14(Thu)18:56 UTC+1 No.626613 Report

dear /diy/,

Today I was talking to a friend and he mentioned that he has a problem.

The problem is basically that he needs to turn or shut a valve whenever necessary remotely, since there are some difficulties when he does it manually.

I had an idea that requires two walkie talkies, an engine and a power source(probably a battery). Basically, when you transmit a signal through the walkie talkie, which will make the engine work as long as the button is pressed. of course, the engine will be attached with a mechanism in order to make the valve turn.

I got the idea from this guy https://www.flickr.com/photos/majet/3726115947/in/photostream/
http://www.youtube.com/watch?v=queB7fdomY4. His idea is simple, but in my opinion similar to my idea.

I am sorry for my bad English and I am even more sorry if you feel that I have wasted your time.

Thank you very much.
Anonymous 04/17/14(Thu)19:28 UTC+1 No.626623 Report

Doable, but you're talking about using a public band. You need a non-trivial decoder at the receiving end to prevent noise and the other people from driving the valve. Depending on your paranoia level, this might require a non-trivial coder at the sending end as well.

What's your actual question?
Anonymous 04/17/14(Thu)19:39 UTC+1 No.626625 Report

Thanks for replying.

just after re-reading my post i noticed that I forgot to ask a question.

I just wanted to ask for a simplified list of what is needed and how to do it. It doesn't need to be complicated; me and my friend will figure the rest on our own.
Anonymous 04/17/14(Thu)19:52 UTC+1 No.626630 Report

How big is the valve?
How hard is it to turn?

How much distance do you want to be able to have between you and the valve?

How important is whatever it's controlling?
What's your budget?

Do you have knowledge of electronics?
Anonymous 04/17/14(Thu)20:31 UTC+1 No.626641 Report

We need to know more about this valve, what it's used for, where it is, and how often it needs to be opened/closed.
Anonymous 04/17/14(Thu)23:21 UTC+1 No.626674 Report

you can get a remote doorbell for about $20. typically it will have 127 device codes to choose from in order to avoid interference. range is around 50 feet.

if the dude is using the same electrical panel as the valve motor, you can use X10 transmitters and receivers that work thru the powerlines. range is 100 feet maybe.

if you need a great distance, using a walkie-talkie, one way to transmit a unique code is by sending phone tones, called DTMF, and programming the receiver to listen for a particular sequence of numbers. any old phone can generate DTMF codes, whereas an Arduino, for example, can use a DTMF library.

some info here: whatcomradio(not spam you faggot moot)wordpress(i hate you, fucker)com/2013/05/28/dtmf-decoding-with-arduino/

PCB here: store.extremeelectronics(not fucking spam)co(piss on moot)in/DTMF-Decoder.html
Anonymous 04/17/14(Thu)23:21 UTC+1 No.626675 Report

aren't there already systems that work like this for golf courses on the MURS band?
Anonymous 04/18/14(Fri)06:29 UTC+1 No.626771 Report

Oh wow that device from the second link looks amazing, can't believe I have never heard of it. I have a baofeng uv5r that would work perfectly with this.

What the guy did in that video is actually illegal if he doesn't have a license since he is transmitting on a gmrs channel. Even then I am not 100% about gmrs used in control applications.

Control applications of MURS seem to be legal though. It does however suck that they are expensive. http://www.gpo.gov/fdsys/pkg/CFR-2006-title47-vol5/pdf/CFR-2006-title47-vol5-sec95-1309.pdf

Also I am over-thinking this, just use two arduino and an nrf24l01 pair. Xbees are pretty popular too, with those you could even cut out the arduino.
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