Liquid Supply System
This project is also called "fuel supply system" used to measure & supply exact amount of liquid like water, petrol, carosene, juice, cold-drinks etc. You can use it in service centre, party and many of places where regularly servicing is required. A pumping motor is required for liquid supply which is poured inside the liquid. Just push buttons and a pumping motor will start to supply the liquid untill the limit is reached.
When switch-ON to start the project, one time measurement is required as 100% measurement. After that output depends on how much percentage is set by user(it can be 1% to 999%). There are three buttons (START/STOP, UP and DOWN) to work with project.
We can understand its function in the following two easy steps :
Step 1: Let 1 litre of water is need to save as 100% measurement. For this purpose, press 'UP & DOWN' button simultaneously to start measuring then the pump will start to supply liquid untill 'STOP' button is pressed. When 1 litre of water is completed, press 'STOP' button and hence amount is saved.
Step 2 : Now its time to have the output. Suppose we need 2 litres of water then by pressing UP/DOWN button set the output to 200%(because 2 litres = 200% of 1 litre). Now press 'START' button. You'll see that the pump starts to supply water. When amount of supply reaches to 2 litres, the pump will automatically stops. If you need½litre of water then set the output to 50%(because½litres = 50% of 1 litre) and hence so on upto 999%.
These are the LCD functional views :
The working principle is based on a proportionaly function "amount is proportional to time" and requires some calculations. When we start to save a measurement the counter counts the time lapsed to supply the liquid. When the output is set to a particular percentage the count is devided with respect to time.
Download the complete code.
Note : Use good quality of pumping motor to prevent harmonics which causes error in LCD reading. Also use required length of wire. Extra wiring produces interference.
(If you have completed this project, send your quality photographs of this project with your details to see in the site.)