Water level alarm 2011-12-29

[3lectrix]

3lectrix submitted a new article:

Water Level Alarm - This circuit will produce an audible alarm when the water level reaches a preset level.The circuit

This circuit will produce an audible alarm when the water level reaches a preset level.The circuit can be powered of a 3V battery and is very handy to use.

The circuit is based on an astable multivibrator wired around IC1 (NE 555).The operating frequency of the astable multivibrator here will depend on capacitor C1, resistances R1,R2 and the resistance across the probes A&B.When there is no water up to the probes,they will be open and so the multivibrator will not produce oscillations and...

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[Roff]

Probes placed in water will eventually corrode if you don't have zero average current passing through them. AC is generally used to prevent this.

EDIT: NE555 (bipolar) is only specified to work down to 4.5V. If you want it to operate at 3V, you should specify a CMOS 555.

 

[Jalpesh Thakkar]

nice simply circuit

 

[mayix_31]

for any kind of water, does it alarm as it is?

 

[jeeski28]

block diagram of rain alarm
...

 

[jeeski28]

wats d difference of rain alarm to dry alarm..

 

[alec_t]

wats d difference of rain alarm to dry alarm..

One gets wet, the other doesn't (hopefully).