using this device we can see the water level ,in upper water tanks.using ac signal it may create more problems and sort circuit.in this device we dosnt use sensors aso we can reduce the amounts.serosly any peoples can use and service this device.using speaker it will give the more accurate sound.the...By: vijeshkp
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from Instructables: exploring - technology - robots http://ift.tt/1IkhSsM
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