AVR-Chat

Thank you for the suggestion Ralph, the application is for the sudden loss
of coolant from an engine, detecting the presence or absence of coolant in
the top tank of a radiator for this the stainless steel probe works well and
is very robust, an earlier system used a pressure switch to detect loss of
pressure but this was not reliable.
The pressure sensor you suggest would work but may not be able to withstand
the vibration and heat which was the case with the pressure switch.
I was thinking that an avr may be able to perform a simular function to the
LM1830 by generating a pulse train on one pin and coupling this to the probe
with a capacitor and using the inbuilt comparator. I was wondering if anyone
had tried this.

Thanking you.
Owen.    

-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of Ralph Hilton
Sent: Monday, 26 September 2005 3:55 PM
To: AVR-Chat@yahoogroups.com
Subject: Re: [AVR-Chat] Water level sensing

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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