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This, in turn, makes the transistors conduct to glow LED and indicate the level of water. When water is rising the base of each transistor gets an electrical connection to 9V DC through water and the corresponding probe. The base of each transistor joins to an aluminum or copper wire with end insulation removed, acting as a probe. We have added 3 LEDs to indicate the three levels (Low, Medium, Full). Here we have created 3 levels (low, medium and full) with respect to the tank capacity. Whenever the tank gets full, we get alerts on particular levels.
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