[attachment=11082]
INTRODUCTION
 Water resources are the sources of water , only 1% of water is potentially utilized by human beings.
 Project deals with conserving water in overhead tanks.
 Water level in the over head tank is continuously displayed on LCD.
 Motor is automatically controlled according to the level of the water.
 Manual switching of motor is carried by using keypad.
BLOCK DIAGRAM
MICRO CONTROLLER
 A microcontroller is a general purpose device, but that is meant to read the data, perform limited calculations on that data and control its environment based on those calculations.
 The AT89S52 provides the following standard features: 8K bytes of Flash, 256 bytes of RAM, 32 I/O lines, Watchdog timer, two data pointers, three 16-bit timer/counters, a six-vector two-level interrupt architecture, a full duplex serial port, on-chip oscillator, and clock circuitry. In addition, the AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving
PIN DESCRIPTION
 8051 is a 40 – pin chip
 32 pins are set for 4 ports P0, P1, P2, P3
 Rest of pins are designed as Vcc, GND, XTAL1, XTAL2, RESET, EA, PSEN, and ALE.
 P0 is interfaced with LCD.
 P1 is interfaced with ULN-2003.
 P2 is interfaced with key pad.
 P3 is interfaced with ADC.
SENSOR
 The type of sensor we used in our application is potentiometer.
 A potentiometer , or pot for short , doesn’t change in resistance with temperature like a thermister, or light level like a CdS light dependant resister.
 It changes with the rotation of a mechanical shaft.. Rotating the shaft changes the resistance between the center and outer two terminals. It'
ADC
 Signals in the real world are analog signals.
 Output of the potentiometer is an analog value.
 This value is compared by the Vref (10k).
 The converted digital output is given to the micro controller.
KEY PAD
 Key pad is used for manual switching of the motor.
 It is interfaced to the port 2 of micro controller.
 If key 1 is pressed, the motor will turns ‘ON’.
 If key 5 is pressed, the motor will turns ‘OFF’.
LCD
 When LCD is being interfaced with microcontroller, the data pins of the LCD are connected to port 0.
 The 8 data pins i.e. pins 7 to pin14 are interfaced with port 0.1 to port 0.7.
 Pin 0(cathode) and pin 16 (ground) are connected to ground. Pin1 (anode) and pin 15 (Vcc) are given with 5v supply.
 Pin 4 to pin 6 (EN, RS, RW) are command pins and they are interfaced with port2.5 to port2.7.
 These pins decide whether the given value is data or command.
ULN - 2003
 ULN-2003 is interfaced to the port 1 of the micro controller.
 It is used to drive LEDs.
 It also drives DC motor.
LED
 A light-emitting diode (LED) is a semiconductor diode that emits incoherent narrow spectrum light when electrically biased in the forward direction of the pn-junction, as in the common LED circuit.
 This effect is a form of electroluminescence.
 LEDs are driven by ULN-2003.
 Green LED indicates that the motor is ‘ON’ .
 Red LED indicates that the motor is ‘OFF’.

its really good project and work done by you all. can the program for this project be available for me , please..