This is a simple design for water level alarm 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. This is the figure of the circuit water level alarm.
The operation of the circuit is based on an multi vibrator wired around IC1 (NE 555).The operating frequency of the unstable multi vibrator 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 multi vibrator will not produce oscillations and the buzzer will not beep. When there is water up to the level of probes, some current will pass through the water, the circuit will be closed to some extend, and the IC will start producing oscillations in a frequency proportional to the value of C1, R1, R2 and the resistance of water across the probes. The buzzer will beep to indicate the presence of water up to the level of the sensing probes. The probes can be made of two insulated copper Aluminum wires and place the probes at the position where you have to sense the level. The power supply for this sensor is 3 V from battery.
The operation of the circuit is based on an multi vibrator wired around IC1 (NE 555).The operating frequency of the unstable multi vibrator 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 multi vibrator will not produce oscillations and the buzzer will not beep. When there is water up to the level of probes, some current will pass through the water, the circuit will be closed to some extend, and the IC will start producing oscillations in a frequency proportional to the value of C1, R1, R2 and the resistance of water across the probes. The buzzer will beep to indicate the presence of water up to the level of the sensing probes. The probes can be made of two insulated copper Aluminum wires and place the probes at the position where you have to sense the level. The power supply for this sensor is 3 V from battery.
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