ok amrith
i will try that way
please tell step by step how to write
& waht kind of gadgets i need to buy
i hope you will give schematic for my project
i have find a project this site like my project that is very nice
but my project have more options i thing you can extent this to
my project with lcd
look here http://www.engineersgarage.com/microcontroller/8051projects/liquid-level-alarm-AT89C51-circuit
i will give actual options later
thanks