Or, your could apply a constant voltage and monitor the voltage drop across a resistor with a DAC


-----Original Message-----
From: Tim Webb [mailto:tim_webb@AGILENT.COM]
Sent: Thursday, January 30, 2003 11:14 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: waterlevel (on/off) on a PIC pin


If you had two electrodes equal in length stuck into a water tank, would the resistance across the two electrodes change as the water level changes?

If so, then by applying a constant current thru the electrodes, as the resistance changes due to water level height, you could monitor the voltage difference using a DAC.

Is that realistic?

-----Original Message-----
From: Brent Brown [mailto:brent.brown@CLEAR.NET.NZ]
Sent: Thursday, January 30, 2003 10:40 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [PIC]: waterlevel (on/off) on a PIC pin


On 30 Jan 2003 at 9:20, Octavio P Nogueira wrote:

> And what about a linear level sensor, I mean
> I want to read from 0 to 100% but without
> moving parts?

Is this what you want?

--
Brent Brown, Electronic Design Solutions
16 English Street, Hamilton, New Zealand
Ph/fax: +64 7 849 0069
Mobile/txt: 025 334 069
eMail:  brent.brown@clear.net.nz


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