[OZAPRS] Flood Sensor -> APRS

[Darryl Smith]

Silicon chip in the last couple of years had a meter for water level in
water tanks. It used two insulated wires from memory, and used the
capacitance of the water to detect the height. 

If I am wrong and there was not an article, I would still use two conductors
and have these in an oscillator generating a frequency. Then have a
frequency to voltage converter. And have this go into a analogue input of an
opentracker.

I do like the idea of using floats such as those sold by Jaycar, but you
will not know if they get stuck

Darryl

---------
Darryl Smith, VK2TDS POBox 169 Ingleburn NSW 2565 Australia 
Mobile Number 0412 929 634 [+61 4 12 929 634 Int] - 02 9618 6459 
www.radio-active.net.au/blog/ - www.radio-active.net.au/web/tracking/


-----Original Message-----
From: ozaprs-bounces at aprs.net.au [mailto:ozaprs-bounces at aprs.net.au] On
Behalf Of Steve
Sent: Saturday, 2 January 2010 12:44 PM
To: ozaprs at aprs.net.au
Subject: Re: [OZAPRS] Flood Sensor -> APRS

Ooh, that waterwheel idea sounds good Andrew.
Hook up a small generating device (such as the 
rectified/filtered/regulated output from a stepper motor), and get it to 
directly power the device that is going to warn you of the flooded creek.
Maybe a small 434MHz data TX module. Some have quite some range, and can 
be modulated with audio. Received on a scanner, etc.
You wouldn't need any batteries to worry about.

Steve.


On 01/02/2010 12:28 PM, Andrew Errington wrote:
> On Sat, January 2, 2010 10:10, James Cameron wrote:
>    
>> Has anyone got an easy and reliable way to sense a flood?
>>      
> Webcam
> Football on a rope, tied to a sprung switch
> Toilet cistern ballcock and switch
> Tennis ball in a vertical pipe
> Ultrasonic distance gauge on a pole, pointing down
> Waterwheel
> Call your friend upstream
> Hook into 'official' sensor network
>
> These are just ideas.  I've never tried them.  I am not sure which ones I
> would class as easy, or reliable.
>
> 73,
>
> Andrew
> ZL3AME
>
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> OZAPRS at aprs.net.au
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>
>
>    

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