********************
KEYPAD INTERFACING
********************
KEYPAD
======
.. image:: ../../_static/images/lecture11_pg2.JPG
    :align: center

HIGH SIDE SWITCHING
===================
.. image:: ../../_static/images/lecture11_pg3.JPG
    :align: center

LOW SIDE SWITCHING
==================
.. image:: ../../_static/images/lecture11_pg4.JPG
    :align: center

KEYPAD CONNECTIONS
==================
.. image:: ../../_static/images/lecture11_pg5.JPG
    :align: center

EXERCISE
=========
- Based on switch array input change the frequency of sound at which the buzzer beeps

HARDWARE
=========
.. image:: ../../_static/images/lecture11_pg7.JPG
    :align: center

SOFTWARE
========
.. image:: ../../_static/images/lecture11_pg8.JPG
    :align: center
.. image:: ../../_static/images/lecture11_pg9.JPG
    :align: center
.. image:: ../../_static/images/lecture11_pg10.JPG
    :align: center

Practise Exercise
==================
- Based on switch array set some tone