Seminar Report on Accelerometer based mouse BY Sania Fazal 512 Parth Jhaveri 519 Ruchita Jobanputra 520 Srilalan Iyer 584 Department of Electronics Engineering Mukesh Patel School of Technology Management and Engineering Vile Parle (West), Mumbai – 400056 NMIMS University
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Seminar Report
on
Accelerometer based mouse
BY
Sania Fazal 512Parth Jhaveri 519
Ruchita Jobanputra 520Srilalan Iyer 584
Department of
Electronics Engineering
Mukesh Patel School of Technology Management and Engineering
Vile Parle (West), Mumbai – 400056NMIMS University
2010-2011
Certificate
This is to certify that the following student/s:
Sania Fazal 512Parth Jhaveri 519
Ruchita Jobanputra 520Srilalan Iyer 584
Have submitted their Minor Project:
Accelerometer based mouse
As part of their curriculum for Trimester IX, course B.Tech, during the academic year 2010-2011
Examiner:______ H.O.D: ________
Acknowledgement
It is indeed a moment of great pleasure and immense satisfaction for
us to express our profound gratitude to all the people who
contributed in making this project a rich experience.
I wish to thank Prof. Govinda Ahuja dept. Electronics Engineering,
Mukesh Patel School of Technology Management and Engineering
for her careful supervision, critical suggestions and encouragement
that has been a source of immense help.
Sincerely,
Sania Fazal Parth Jhaveri
Ruchita Jobanputra Srilalan Iyer
Abstract
Many tasks that are performed on the computer require the use of both a keyboard and the
mouse, and many people find it frustrating and awkward to have to switch back and forth
between them. The air mouse can be a great solution for this. As computers have evolved
from 66MHz to the 3+GHz today, the mouse has remained relatively unchanged. There have
been only two major changes to the mouse since its inception: more buttons, and interface
changes (PS/2, USB, Wireless) but the core interaction method has not changed. The touch
pad mouse and the stick mouse have been designed for a laptop, but have not gained
momentum outside of laptops. And most laptop users usually carry a USB mouse with the
laptop as well. The accelerometer based mouse can be treated as the new age input device. It
is more natural in its feel and provides the user with better ease of use. The user interface of
applications can be changed to utilize the free hand movement possible with the device.
Introduction
This project demonstrates the use of an accelerometer as a computer mouse, but first what is
an accelerometer? It is a device that can measure acceleration and the pull of gravity. There
are multiple ways of doing this, the particular one I’m using works with the capacitive
method. Inside the chip is a capacitor with an extra plate in the middle that can move. As you
know the closer the objects are together the bigger the capacitance, the circuit inside the chip
measures the capacitance difference between the two plates and the middle one. Finally, the
circuit coverts this into an analog signal between 0V and 3.3V. All of this is small enough to
fit in to a small SMD chip.
The accelerometer used in this project is MMA7361L manufactured by NEX ROBOTICS INDIA. It has acceleration range along X, Y, Z axis and also has high sensitivity of 800mV/g @1.5g.
The MMA7361LT is a low power, low profile capacitive micromachined accelerometer
featuring signal conditioning, a 1-pole low pass filter, temperature compensation, self-test,
0g-detect which detects linear freefall, and g-Select which allows for the selection between 2
sensitivities. Zero-g offset and sensitivity are factory set and require no external devices. The
MMA7361LT includes a sleep mode that makes it ideal for handheld battery powered
electronics.
BLOCK DIAGRAM
The above image shows the block diagram of the ACCELEROMETER BASED MOUSE.
The main components used are:
1. Accelerometer MMA7361.
2. Atmega 16 Microcontroller.
3. MAX232 serial communication to PC.
4. The LCD display.
The basic working of all these components will be explained later in the report.
1. Accelerometer MMA7361
MMA7361L is a Three axis Low-G accelerometer Module which gives selectable
acceleration range from ±1.5g or ±6g. Board has all the necessary components required for
the chip. Board made up of high quality silver plated double sided PCB for giving extra
strength to the connectors.
MMA7361L accelerometer has building signal conditioning, a 1-pole low pass filter,
temperature compensation, self test, 0g-Detect which detects linear freefall, and g Select
which allows for the selection between 2 sensitivities. It also includes a Sleep Mode that
makes it ideal for handheld battery powered electronics.
Possible applications of this board includes 3D-Gaming: Tilt and Motion Sensing, Event