Here is a simple water level alarm circuit that 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 active about IC1 (NE 555). The operating abundance of the astable multivibrator actuality will depend on capacitor C1, resistances R1,R2 and the attrition beyond the probes A&B.When there is no baptize up to the probes,they will be accessible and so the multivibrator will not aftermath oscillations and the buzzer will not beep.
When there is baptize up to the akin of probes, some accepted will canyon through the water,the ambit will be bankrupt to some extend,and the IC will alpha bearing oscillations in a abundance proportional to the amount of C1,R1,R2 and the attrition of baptize beyond the probes. The buzzer will beep to announce the attendance of baptize up to the akin of the analysis probes.
