SV: [basicstamps] liqiud level sensor using a DS2405

Archiver

Greetings!

I would say that it depends on how pure the water is.
Pure water is a lousy conductor...

Also, it's not always advisable to use electrisity near water.

There's no way you could use a simple flotation device, then?
(A piece of foam, connected to a microswitch which connects or deconnects a
DS2401 to the 1-wire bus)
It's much simpler to measure...
(Either the chip is there or it isn't :-)

:-)
Trygve

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Opprinnelig melding

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Fra: uriwimi6 <uriwimi6@y...> [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=aPQEIo6NN_Pn-VPzkPuqPDJ3WOpCFfBFoSyGRm35WrSfbVB-Of3dAQQAKri0HEFi1n6Q_cPXH8-t0LWV]uriwimi6@y...[/url
Sendt: 15. desember 2002 19:44
Til: basicstamps@yahoogroups.com
Emne: [noparse][[/noparse]basicstamps] liqiud level sensor using a DS2405


Hi,
I was wondering if anybody on the list can tell me if the circuit
I've concocted will work. I uploaded to the photo section as
Ds2405_liq.

Thanks
Kevin M.


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Archiver

What is the liquid you are using?

I built a bilge pump controller for my sailboat using a Stamp. It is
basically a water level sensor. The water in this case is lake or river
water - even tap water works.

The sensor consists of two stainless steel screws about 1 inch apart (the
probes), connected to two Stamp pins.
The Stamp sets one pin as input, the other as output. It then puts a high
on the output pin, and checks to see if the input pin is high. If so, there
is water!. I found that tap water has enough conductivity such that 5 volts
from a stamp output pin through the water to the input will cause the input
pin to turn on.

One of the problem of using direct current on probes in water is that you
can actually cause electroplating to occur. Alternating current is better.
So the code in the Stamp alternates the input and output pins each time
through the testing loop, so that one pin has 1 +ve voltage on it one time,
and the other pin has it the next time.

If you are interested in pursuing this approach, let me know and I'll dig
up the schematic and code for you.

Larry

At 07:55 PM 12/15/2002 +0100, you wrote:
>Greetings!
>
>I would say that it depends on how pure the water is.
>Pure water is a lousy conductor...
>
>Also, it's not always advisable to use electrisity near water.
>
>There's no way you could use a simple flotation device, then?
>(A piece of foam, connected to a microswitch which connects or deconnects a
>DS2401 to the 1-wire bus)
>It's much simpler to measure...
>(Either the chip is there or it isn't :-)
>
>:-)
>Trygve
>
>
>

---

Opprinnelig melding

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>Fra: uriwimi6 <uriwimi6@y...> [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=Q7w7FBR2l2zMOcUINwPngg4q4SOdiAOb5X0N5TbfwmauD0FPUHiECzv39ZF23FRFloIAYE535IvLjFU]uriwimi6@y...[/url
>Sendt: 15. desember 2002 19:44
>Til: basicstamps@yahoogroups.com
>Emne: [noparse][[/noparse]basicstamps] liqiud level sensor using a DS2405
>
>
>Hi,
>I was wondering if anybody on the list can tell me if the circuit
>I've concocted will work. I uploaded to the photo section as
>Ds2405_liq.
>
>Thanks
>Kevin M.
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>
>To UNSUBSCRIBE, just send mail to:
> basicstamps-unsubscribe@yahoogroups.com
>from the same email address that you subscribed. Text in the Subject and
>Body of the message will be ignored.
>
>
>Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/

Larry Bradley
Orleans (Ottawa), Ontario, CANADA