Water level indicator circuit (5)

Published:2011/6/7 6:13:00 Author:Christina | Keyword: Water level, indicator | From:SeekIC

The water level indicator uses the LED to indicate the three stages water level of high, medium and low, and it can be used in wide range of water level indication applications such as the water tank, the pool, the boiler and the underground wells. The circuit working principle: the water level indicator is composed of the water level electrodes A-D, the resistors Rl-R6, the capacitors Cl-C3, the time base circuits ICI-IC3 and the LEDs VLl-VL3, as the figure shows. When there is no water in the tank, the +6V voltage adds to the pin-2 and pin-6 of the ICl-IC3 getsthrough Rl-R3, so pin-2 and pin6 have the high electrical level, pin-3 of ICl-IC3 output the low electrical level, VLl-VL3 will not turn on.



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