AVR-Chat

Over the years, I have tried many ways to measure the height of
the water in our fiberglass fresh tank, which holds only up to
3.5 ft of head.
I have recently been using a cheap pressure sensor, connected to
an AVR to process the signal, display, and sound alarms.
The sensors are not easy to use for various reasons.
Before the pressure system, I used a thin sheet of aluminum glued
flat to the outside of the tank, forming one side of a capacitor,
the water the other.  The capacitance, and hence the depth, was
measured by listening to the pitch of the oscillator.
Ken


> On Mon, 26 Sep 2005 15:21:18 +1000 you wrote:
>
>>I have in the past used the NS LM1830 chip to monitor loss of water this
>>chip feeds an ac signal to a probe, ac is used to prevent build up of
>> oxides
>>on the probe but can no longer find a supplier of these chips in
>> Australia.
>>Has anyone tried using a micro for this purpose and had success.
>
> The MPXV5004G from Freescale measures the water level directly by pressure
> and might be of
> interest.
> --
> Ralph Hilton
> http://www.ralphhilton.org
> C-Meter: http://www.cmeter.org
> FZAOINT http://www.fzaoint.net
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