In this Article Researchers introduced Ball
Pen Ink level Indicator(BPILI). In our daily life
humans are using pen to write the literature, notes etc.
thingsand majority of pens are used in daily life.Every
person like students as well as Businesses menuses
ballpoint pens for writing. There are different types of
penshapes and different colored pens available in
market. There are different types of pens are available
in market such as Ballpoint pen, fountain pen, gel pen,
stylusetc. pens are used. When we all use the pen every
time but at some time ink available in the Refill of pen
have decreases. But user cannot check the status of ink
available in refill every time, because of thick or heavy
cover over the refill. When ink level is at the end, the
user cannot write a single word at that time user must
be change the refill and after that pen may be in use. In
this research we focus on that with the help of
transistor switching circuit user can know the real time
status of the ink level in the refill and before end of the
ink in the refill user can be ready to change the refill.
Keywords : Pen, refill, Transistor, LED, battery, connectors.