Water sensor rain alarm using 555 timer circuit

This Water sensor rain alarm circuit is designed using 555 timer circuit.
The water sensor of it is made by two metal electrodes arranged very close that a drop of water (liquid) will bridge them .
The electrode sensor can be made on a little pcb .If the liquid ( wather ) is very pure you may change the resistor value to 2.2m ohms and if the circuit is give false alarm sensing you may change the value of resistor to 220k . This water sensor (water detector ) it’s use a 555 Cmos timer and one relay which will be close when the bridge between electrodes exist .