issue 1


Submitted by, Ajinkya Mate, Monika vaidya,Bhavika Shende, Aarti kurmate,Kalmesh Binekar

Guided by, Prof.Chetana Dolase


Automatic water level controller for both overhead and underground tank is designed to monitor the level of water in a tank. It displays the level of water and when it is at the lowest level; a pump is activated automatically to refill the tank. When the tank is filled to its maximum capacity, the pump is automatically de-energized. Several circuits are put together to ensure proper working of this design, and the block diagram includes the supply unit, the micro-processor unit, the sensor unit, the display unit and the pump drives unit.

The power unit is responsible for turning on the entire circuit.


Micro controller, motor, sensor


“Automatic water level control with an automatic pump control system” is  design to monitor the level of liquid in the tank.

The system has an automatic pumping system attached to it so as to refill the tank once the liquid gets to the lower threshold, while offing the pump once the liquid gets to the higher threshold. Sustainability of available water resource in many reason of the word is now a dominantissue.

This problem is quietly related to poor water allocation, inefficient use, and lack of adequate and integrated water management. Water is commonly used for agriculture, industry, and domestic consumption.

Therefore, efficient use and water monitoring are potential constraint for home or office water management system. Moreover, the common method of level control for home appliance is simply to start the feed pump at a low level and allow it to run until a higher water level is reached in the water tank.

This water level control, controls monitor and maintain the water level in the overhead tank and ensures the continuous flow of water round the clock without the stress of going to switch the pump ON or OFF thereby saving time, energy, water, prevent the pump from overworking Besides this, liquid level control systems are widely used for monitoring of liquid levels in reservoirs, soils.


The Project presented here waters your plants regularly when you are out for vocation. The circuit comprises sensor parts built using op-amp IC LM324. Op-amp’s are configured here as a comparator. Two stiff copper wires are inserted in the soil to sense the whether the Soil is wet or dry.

The Micro controller was used to control the whole system it monitors the sensors and when more than two sensors sense the dry condition then the micro controller will switch on the motor and it will switch off the motor when all the sensors are in wet. The micro controller does the above job it receives the signals from the sensors, and this signals operated under the control of software which is stored in ROM.

The System is fully controlled by the micro controller AT89S52. It is a popular 8 bit micro controller.. All the above functions are monitored and controlled by the 8 bit micro controller AT89S52 

The proposed circuit of switching . The circuit consists  switching transistor (1N2222) and relays . It  is used to give the multiple outputs from a single input. The switching transistor is used to for switching action. For the operation of the IC +5 volt regulated power supply is provided and for the operation of the relays +12 volt supply is provided. As we operated the  for control of devices we give single input to the  IC.  This IC converts the single input into the multiple outputs. This output is forwarded to the to the switching transistor through the resistive network. Due to the action of the switching transistor the coil of the relay operates and the relay gets into action which causes the switching of the devices.


1. Diode

A diode is a two-terminal electronic component that conducts current primarily in one direction (asymmetric conductance); it has low (ideally zero) resistance in one direction, and high (ideally infinite) resistance in the other

2. Resistors

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other use

3. Bridge Rectifier

There are several ways of connecting diodes to make a rectifier to convert AC to DC. The bridge rectifier is one of them and it is available in special packages containing the four diodes required.

4. Microcontroller

In simple terms, it is the number of bits of data an ALU can process at a time. For example, 8 bit microcontroller has an 8 bit ALU.

5. Stepdown transformer

A step-down transformer converts the high voltage (HV) and low current from the primary side of the transformer to the low voltage (LV) and high current value on the secondary side of the transformer.


It controls ‘on’ and ‘off’ conditions of the motor depending upon the level of water in the tank. The circuit also protects the motor from high voltages, low volt-ages, fluctuations of mains power and dry running.


During the course of designing this system there were series of problems encountered which came on the way of achieving the desired goals of this project. Some parts require re-designing and the software debugging also created a bit of the problem


A is a facility with instruments and equipment to make observations of conditions in order to provide information to make process of manufacturing with good quality. The measurements taken include sensor, mounts.  Measurements are taken as free of other obstructions as possible,. Manual observations are taken at least once daily, while automated observations


Introduction to Thyristor and its Application
M. Ramamurthy
East West Press pvt ltd, Chennai edition

Power electronics laboratory
O. P. Arora
Wheezes publication, New Delhi.  

Power electronics and drive
G. k. Dubey and C. Rao|
Tata Mc. Graw hill international ltd.

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