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ULN2004 water level indicator circuit

This ULN2004 electronic project circuit diagram design is a very simple water level indicator circuit project . This ULN2004 water level indicator circuit is very simple and require few external electronic parts .

ULN2004 is a high voltage, high current darlington arrays that contain seven open collector darlington pairs with common emitters . Each channel rated at 500mA and can withstand peak currents of 600mA.
As the water level rise in the tank , it comes in contact with probes P1 through P7 and thereby makes pins 7 trough 1 high sequentially . The corresponding output pins 10 trough 16 go low one after other and LED1 through LED7 will light up . When water comes in contact with the last probe P7 , the buzzer connected to the last pin 16 will sound .
This electronic circuit project must be powered from a fixed output DC voltage that will provide an output voltage between 9 and 12 volts .

ULN2004 water level indicator circuit design electronic project

Electronic Circuits: 


I was curious as to what type of Buzzer is being used in the Water Level Indicator Circuit. Is it piezo or electromagnetic? and what are its electrical specs. if any? I'd appreciate any information! Thank you, Chris

Is this circuit robust, reliable? Can it be used as a top water level indicator to turn off a valve without risk of overflow from failure?

Will it damage the IC if I give 12v 1A DC Adaptor as the source ?

Hi, The LED lights I bought didnt hold good with 12 and 500mA. Is there any specification of LED I should buy