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\title{Programmable voltage source}
\date{}
\author{N. Natarajan}
\maketitle
\section{Objective}
To create a programmable voltage source using {\tt OCx} interrupt.
\section{Task}
In this project you have to create programmable voltage source.
The program will read a two digit decimal number and create a PWM
signal on the port D pin{\tt  PD3}. The average voltage should be
1/10-th the input value. For example, if the user enters {\tt 26},
the average voltage should be 2.6 Volts. Your main loop must
perform the following tasks:
\begin{enumerate}
\item
Read the input from the user and adjust the duty cycle of the PWM
signal accordingly.
\item
Measure the output voltage using the onboard A/D convertor and
display it on the screen. You will have to write a function that
will print a number between 0 and 50 in decimal.
\end{enumerate}
Note: You must clearly state how you handle the two extreme
values: 0 volts and 5 volts.
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