The use of water level indicator is common nowadays. This circuit of this project is simple, economical and versatile. It is used to switch on the motor pump when the level of water falls below the lowest level in tank.This water level indicator with display is based on two IC that is 74147 IC and 4511 IC. Water level indicator has a number of advantages, like: Most of the circuit display level of water with the help of LED. In this you will get display on common cathode 7 segment display. Therefore it becomes easy to find the level of water in tank. It can be easily installed in over headed tanks because of lesser components used in circuits. It prevents the wastage of water due to over flow of tank. It can be operated with the help of 12V battery or adaptors (converts 230V AC to 12V DC) readily available in markets.
The water level controller cum indicator is common nowadays. It is built using timer NE555, inverter buffer CMOS IC CD4049 and ULN2003.The [[wysiwyg_imageupload::]]components used here have low cost, are easy to build and install on the overhead tank so as to prevent wastage of water. This circuit of this project is simple, economical and versatile. It is used to switch on the motor pump when the level of water falls below the lowest level and turns off the motor when the tank is full. This project has a very simple circuit consisting of 3 probes which are used for automatic fill and cut of the water supply in tank. These are GROUND, HIGH and LOW. The GROUND probe is used for the reference. When the circuit is powered up for the first time the pump should be started automatically if the vessel is empty (or the level is below the required minimum level). As the HIGH level of the probe is reached, the pump must STOP. If the tank/container is already FULL then nothing should happen.