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water level indicator

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Chandu Nagabrahmam

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hi guys..
Im doing project on water level indicator, I have designed water level sensor using transistor BC547.(circuit is attached)
The LED glows when probes touches the water. the output of the sensor is given to microcontroller.
I need some 5v to drive the port pins. but sensor output is below 3 volts. what can i do to get 5v and if I can amplify it, please provide the amplifier circuit.
 

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  • Liquid level alarm using AT89C51_0.gif
    Liquid level alarm using AT89C51_0.gif
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I have a problem , in that your words do not match the circuit. There is no LED in the circuit. To make sure that the transistors turn on connect a high value resistor between their bases and the +Vcc - 1 meg X 4?
Frank
 

sorry about the circuit, here is the one I have attached
 

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  • simple-water-level-indicator-circuit.gif
    simple-water-level-indicator-circuit.gif
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why do you need a LED in the probe? You are losing 1v6 by including it. AC on the probe is generally preferred.
 

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