I was thinking something along the lines of a sealed potentiometer and a fl=
oat.
You are on the other side of the lake :/

----------------------------------------
> From: bobblick@ftml.net
> To: piclist@mit.edu
> Subject: Re: [EE] WATER DEPTH
> Date: Mon, 26 Jan 2015 18:17:35 -0800
>
> I designed a water level remote gauge for home/commercial tanks about
> thirty years ago that had a vinyl tube with a weight at one end and a
> pressure sensor on the other end. Throw the weighted end into the water
> and the column of air becomes pressurized proportional to the water
> depth. It does require a method of keeping the tubing free of water.
>
> Left to itself, water migrates up the tubing. This takes a long time but
> is inevitable! Even if you try to outsmart it with a large
> bellows/balloon/etc.
>
> So you put a tee at the sensor end and attach a fishtank pump with a
> timer set to run for a minute every night.
>
> About ten years ago I stopped doing it that way, switched to ultrasonic.
> Waaaaay cheaper! It's a moist environment but drinking water isn't
> corrosive and there's no splashes, just add lots of conformal coating to
> everything except the transducers.
>
> Cheerful regards, Bob
>
> On Mon, Jan 26, 2015, at 05:15 PM, IVP wrote:
>> (tag changed)
>>
>> I've used a 4-20mA depth gauge that measured to 6m to a
>> couple of mm (their words)
>>
>> It was a long thin (6-7mm) yellow hose containing the wires and I
>> believe a Honeywell pressure sensor at the sealed end. Comparing
>> the output to a ruler showed it was pretty accurate, bearing in mind
>> inaccuracies of the PIC's ADC
>>
>> Joe
>
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