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(College logo) Project synopsis on WATER LEVEL CONTROLLER WTH AUTOMATIC MOTOR ON\OFF Under taken by: Name 1 Roll no. 1 Name 2 Roll no. 2 Name 3 Roll no. 3 Name 4 Roll no. 4 ABSTRACT As the name depicts, a water level controller is an automatic device used to monitor a particular level of water (for example in an overhead tank) and restrict it from exceeding the limit. The simple circuit design for such a controller shown here may be easily built and installed and may relieve you from the headache of manually operating the water pump in time. Automatic water level controller circuit is a simple engineering project. It can automatically switch ON and OFF the domestic water pump set depending on the tank water level. The main advantage of this water level controller circuit is that it automatically controls the water pump without any user interaction. WORKING PRINCIPLE Two probes ‘A’ and ‘B’ are inserted into water tank one at bottom and the other one at the top. Initially when A and B are not connected, i.e. water level is low, the input pin1 of the IC is at logic high and according to NOR gate truth table, the output at pin3 will be at logic low. Since pin3 is shorted to pins 5 and 6, hence the input to other NOR gate will be logic low signals. This gives a logic high signal to the corresponding output pin 4. As current flows through the resistor to the base of transistor, it starts conducting and acts as a closed switch. The relay connected to the collector of the transistor gets energized and the NO contacts get connected to the common contact and the water pump gets power supply from the mains and starts working. Now when water level rises in the tank such that probes A and B are connected through water, current flows through them (As water is a conductor) and the pins 1 and 2 are connected through A and B to the negative supply of the battery. The output pin3 is thus, at logic high level, causing the input pins of the other NOR gate to be at logic high level and thus the corresponding output pin4 is at logic low level. The transistor gets cutoff due to lack of bias current and the relay gets correspondingly de-energized and the power supply to the water tank gets cut off. BLOCK DIAGRAM COMPONENTS REQUIRED HARDWARE 1. 555 Timer 2. DC Power Supply 3. LCD 16*2 4. NPN Transistor 5. Diodes 6. Capacitors 7. Resistors 8. Connecting wires 9. Relay 10. SOFTWARE 1. NA APPLICATIONS Most of the circuits only display the amount of water present in circuit, but this circuit will switch "on" and "off" the motor according to the level of water present in tank. It will not automatically stop the motor when tank is fill but it will "on" the motor when water in tank reaches below a specific point. 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. Can be operated with the help of 12V battery or adaptors (converts 230V AC to 12V DC) readily available in markets. REFERENCES http://www.brighthubengineering.com/consumer-appliances-electronics/68342build-this-simple-electronic-water-level-controller/ http://www.circuitsgallery.com/2012/05/automatic-water-tank-levelcontroller.html http://www.engineersgarage.com/contribution/anjali/automatic-water-levelcontroller http://www.eleccircuit.com/simple-automatic-water-level-controller-circuit/