Automation of Water Pump

i want to automate my home water pump using microcontroller. my pump should not work when there is no water in line and when my tank water level is high. however should work when water level is low and then check for water in line and if there is water in line the it should switch on the pump and switch it off when tank is full.
my pump is of 1/2 HP
plzzzz guide me with the type of microcontroller and sensors to be used and also it’s program.

I presume you want to pump water into an overhead tank from an underground one, right? Or is it that you want to simply boost the pressure from your existing water line or tap?

You will need some sort of sensor to sense the level of water in the overhead tank (call it S1) and another to either check water level in the underground tank or the water pressure in the tap/line (call this S20)

Start pump if, S1 reads low and S2 reads high, else stop the pump.

The program could be something like (using BASIC pseudo-code notation),
Sensors S1 & S2 are physically connected to ports P1 & P2 for the below...


[code lang="vb" line="none"]
DECLARE PIN1 AS P1 ANALOG_INPUT -- Setup uC pin 1 as analogue input port P1
DECLARE PIN2 AS P2 ANALOG_INPUT -- Setup uC pin 2 as analogue input port P2
DECLARE PIN3 AS P3 DIGITAL_OUTPUT -- Setup uC pin 3 as digital output port P1

WHILE (TRUE)
BEGIN
READ PORT P1 -- Read Sensor S1
READ PORT P2 -- Read Sensor S2

IF P1 < [Some preset level] AND P2 > [Some preset level]
BEGIN
WRITE S3 port HIGH --Turn on pump relay connected to port P3
END
ELSE
BEGIN
WRITE S3 port LOW --Turn off pump relay connected to port P3
END
END
[/code]

actually in india the water supply is only available in morning and evenings so i want to automate that whenever there is a supply of water from local tubewell to our home it should use this system and work automatically.
thnx for the code and please give me the circuit for the microcontroller and also which microcontroller i should use???
i dont have much knowledge about microcontrollers... so plz help

A simpler solution would be to inquire at the local shop for some sort of pressure switch that can be added to the water line - this switch will sense pressure in the line and turn on the pump and whenever the pressure drops it will turn off the pump.

If you put a simple copper wire in water & you have potential applied in water say 5 volts then copper wire will conduct (gives you some idea about sensors?).
This wire can not be interfaced directly with the controller so you need a switch in between (remember transistor can act as a switch).
To control the Pump you need to have a relay in between which will switch ON/OFF motor through a micro-controller but you need to have a transistor in between to protect your Micro controller.
Now what is left is the code, i have given you hints now you can develop your own algorithm & start writing a code if you are stuck anywhere we are here to help you, but you must start.
Cheers!

Float level switches is what your after also pressure sensors on the line a combination of both required i would give you the results you require


http://www.madisonco.com/single_point/single_point.php