Water level indicator circuit (1)

Published:2011/5/26 22:04:00 Author:Christina | Keyword: Water level, indicator | From:SeekIC

Circuit operating principle This water level indicator circuit is composed of the water level detection electrode A-E, the voltage stabilization diode VS, the resistors Rl-R9, the four op-amps Nl-N4 and the LED VLl-VM, as the figure shows. When there is no water in the tank, the reversed-phase input port voltages of the op-amps Nl-N4 are higher than +5V, so the Nl-N4 output the low electrical level, the LEDs VLl-VL4 turn off. When the water level of the tank gets to the electrode D, the water resistance connects the electrode D with the electrode E to make the operational amplifier Nl's inverting input port (pin-2) voltage lower than +5V.



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