Oscilloscope On Android Phone
OSCILLOSCOPE ON ANDROID PHONE
1
KALYANI GANVIR , 2HEMANT WAGHMARE
Department of Electronics &Telecommunication
Mit College of Engineering, Aurangabad, Maharashtra, india
Abstract - An oscilloscope, previously called an oscillograph, and informally known as a scope, CRO or DSO is a type of
electronic test instrument that allows observation of constantly varying signal voltages, usually as a two-dimensional graph
of one or more electrical potential differences using the vertical or y-axis, plotted as a function of time. Handy Oscilloscope
is most important gadget in this mobile generation. Where no one is sitting at a place to finish their works . We all are in
hurry and needs gadgets follow our moves. We were just thinking about to carrying a gadget that will be easily carried from
one place to another and work efficiently as an oscilloscope. To implement an oscilloscope using mobile instead of carrying
another gadget which is a good idea Android based oscilloscope which requires nothing but a small circuitry to manage
inputs and provides to android Bluetooth sensors. The Android platform includes support for the Bluetooth network stack,
which allows a device to wirelessly exchange data with other Bluetooth devices. The application framework provides access
to the Bluetooth functionality through the Android Bluetooth APIs. These APIs let applications wirelessly connect to other
Bluetooth devices, enabling point-to-point and multipoint wireless features.
Keywords- Specification Bluetooth core V2.0 compliant, SPP Support UART, USB, PCM, I2C interface to host system
I.
• The runtime
The Android runtime consists of two
components. First a set of core libraries which
provides most of the functionality available in the
core libraries of the Java programming language .
Second the virtual machine Dalvik which operates
like a translator between the application side and the
operating system. Every application which runs on
Android is written in Java. As the operating system is
not able to understand this programming language
directly, the Java programs will be received and
translated by the virtual machine Dalvik.
INTRODUCTION
The term “Android” has its origin in the
Greek word andr-, meaning “man or male” and the
suffix - eides, used to mean “alike or of the species”.
This together means as much as “being human”.
Andorid is a software stack for mobile
devices which means a reference to a set of system
programs or a set of application programs that form a
complete system. This software platform provides a
foundation for applications just like a real working
platform. The software stack is divided in four
different layers, which include 5 different groups:
• The application layer
The Android software platform will come
with a set of basic applications like browser, email
client, SMS program, maps, calendar, contacts and
many more. All these applications are written using
the Java programming language. It should be
mentioned that applications can be run simultaneousl,
it is possible to hear music and read an email at the
same time. This layer will mostly be used by
commonly cell phone users.
• The application framework
An application framework is a software
framework that is used to implement a standard
structure of an application for a specific operating
system. With the help of managers, content providers
and other services programmers it can reassemble
functions used by other existing applications.
• The libraries
The available libraries are all written in
C/C+They will be called through a Java interface.
These includes the Surface Manager (for compositing
windows), 2D and 3D graphics, Media Codecs like
MPEG-4 and MP3, the SQL database SQLite and the
web browser engine WebKit.
Major components of the Android operating system
The translated code can then be executed by
the operating system. A very important notice is that
applications will be encapsulated in Dalvik. For every
program an own virtual machine is available even if
some programs are running parallel. The advantage is
that the different programs do not affect each other,
Proceedings of IRAJ International Conference, 21st July 2013, Pune, India, ISBN: 978-93-82702-22-1
59
Oscilloscope On Android Phone
so a program error for example can lead to a crash of
the program but not of the whole system.

Query the local Bluetooth adapter for paired
Bluetooth devices
 Establish RFCOMM channels
 Connect to other devices through service
discovery
 Transfer data to and from other devices
 Manage multiple connections
Now we are suppose to establish the connection
between a Bluetooth based hardware and android
phone. To establish a connection between both
devices we needs to consider android device as a
master slave and another Bluetooth device as a slave
to pair both devices.
After establishing a connection we can send
commands between both devices and start operating
and receiving data for Oscilloscope device. This
device communication receives data in continuous
form through listeners events and collect received
data into a vector form. Vector form is required to
prepare graph plot on GUI.
• The kernel
The Linux Kernel will be used by Android for its
device drivers, memory management, process
management and networking.
APPLICATION MODEL
In Android’s application model [1], an
application is a package of components, each of
which can be instantiated and run as necessary
(possibly even by other applications). Components
are of the following types:
 Activity components form the basis of the
user interface; usually, each window of the
application is controlled by some activity.
 Service components run in the background,
and remain active even if windows are
switched. Services can expose interfaces for
communication with other applications.
 Receiver components react asynchronously
to messages from other applications.
 Provider components store data relevant to
the application, usually in a database. Such
data can be shared across applications.
II.
SYSTEM DESIGN
1. Hardware
The Atmega16 Is A Low-Power CMOS 8-Bit
Microcontroller Based On The AVR Enhanced RISC
Architecture. By Executing Powerful Instructions In
A Single Clock Cycle, The Atmega16 Achieves
Throughputs Approaching 1 MIPS Per Mhz Allowing
The System Designer To Optimize Power
Consumption Versus Processing Speed.The device is
manufactured using Atmel’s high density nonvolatile
memory technology.
The boot program can use any interface to
download the application program in the Application
Flash memory. Software in the Boot Flash section
will continue to run while the Application Flash
section is updated, providing true Read-While-Write
operation. By combining an 8-bit RISC CPU with InSystem Self-Programmable Flash on a monolithic
chip, the Atmel ATmega16 is a powerful
microcontroller that provides a highly-flexible and
cost-effective solution to many embedded control
applications.
The transmitter
circuit
uses
Microchip's ATMega8 for
the
analog-to-digital
conversion of the input signals on two channels
Important features integrated in Android
Android offers many features cover many
areas such as application development, internet,
media and connectivity. Some of the most important
ones are presented in the following list [GO2008-2].
 Application framework enabling reuse and
replacement of components
 Dalvik virtual machine optimized for mobile
devices
 Integrated browser based on the open source
WebKit engine
 Optimized graphics powered by a custom
2D graphics library; 3D graphics based on
the OpenGL ES 1.0 specification (hardware
acceleration optional)
 SQLite for structured data storage
 Media support for common audio, video,
and still image formats (MPEG4, H.264,
MP3, AAC, AMR, JPG, PNG, GIF)
 GSM Telephony (hardware dependent)
 Bluetooth, EDGE, 3G, and WiFi (hardware
dependent)
 Camera, GPS, compass, and accelerometer
(hardware dependent)
 Rich development environment including a
device emulator, tools for debugging,
memory and performance profiling, and a
plugin for the Eclipse IDE
Using the Bluetooth APIs, an Android application can
perform the following:
 Scan for other Bluetooth devices
Block Diagram
Proceedings of IRAJ International Conference, 21st July 2013, Pune, India, ISBN: 978-93-82702-22-1
60
Oscilloscope On Android Phone
. The processed data on the ATMega8 are
then transmitted to the phone (for waveform display)
via the Bluetooth SPP module.
Applications:  Where the need of remotely presentation.
 Where no need to keep Bulky CRO Device.
 Where does no maintenance required.
 Handy in size that’s why most suitable for
Laboratory used and college.
 Always applicable where low cost device
required.
2 .AUBTM-20 Bluetooth V2.0 Class 2 module
20 offers a bi directional digital audio interface that
routes directly into the baseband layer of the on chip
firmware. It does not pass through the HCI protocol
layer. Hardware on AUBTM-20 allows the data to be
sent to and received from a SCO connection. Up to
three SCO connections can be supported by the PCM
interface at any one time1. AUBTM-20 can operate
as the PCM interface Master generating an output
clock of 128, 256 or 512kHz. When configured as
PCM interface slave it can operate with an input
clock up to 2048kHz.
AUBTM-20 is Bluetooth Core V2.0 compliant
module with SPP. The module is designed to be
embedded in a host system which requires cable
replacement function. Typically the module could
interface with a host through the UART port. The
module could be used in many different application ,
e.g.
• Hand held terminals
• Industrial devices
• Point-of-Sale systems
• PCs
• Personal Digital Assistants (PDAs)
• Computer Accessories
• Access Points
• Automotive Diagnostics Units
This module could both act a SPP master and a SPP
slave. When in master mode, the module could search
for all the working SPP slave devices around and the
host could select which to connect. When it is in
slave mode, it will listen for connection request from
another SPP master device.
Device Terminal Descriptions
 UART
Bluetooth Module
AUBTM-20 is compatible with a variety of clock
formats, including Long Frame Sync, Short Frame
Sync and GCI timing environments. It supports 13 or
16-bit linear, 8-bit µ-law or A-law companded sample
formats at 8ksamples/s and can receive and transmit
on any selection of three of the first four slots
following PCM_SYNC. AUBTM-20 interfaces
directly to PCM audio devices including the
following:
• Qualcomm MSM 3000 series and MSM 5000 series
CDMA baseband devices
• OKI MSM7705 four channel A-law and µ-law
CODEC
• Motorola MC145481 8-bit A-law and µ-law
CODEC
• Motorola MC145483 13-bit linear CODEC
• STW 5093 and 5094 14-bit linear CODECs
AUTBM-20 is also compatible with the Motorola
SSI™ interface.
AUBTM-20 UART provides the main interface
to exchange data with other host system using the
RS232 protocol. An external commands set is
provided for the host system to control and configure
AUBTM-20. Four signals are provide for UART
function. TXD and RXD transmit data between
AUBTM-20 and the host. NRTS and NCTS provides
the RS232 hardware flow control mechanism. All
UART pins are CMOS logic with signal levels of 0V
to VDD. UART is initially configured to work at
9600 bps baudrate, 8-bit, no parity and 1 stop bit. The
host could reconfigure the UART by issuing
command.

PCM
III.
Pulse Code Modulation (PCM) is a standard
method used to digitize audio (particularly voice)
patterns for transmission over digital communication
channels. Through its PCM interface, AUBTM-20
has hardware support for continual transmission and
reception of PCM data, thus reducing processor
overhead for wireless headset applications. AUBTM-
ANDROID ADVANTAGE
Advantages of an Android are listed as:
• Time for a change.
• Android scales to every device.
• it’s supported by some hardware manufacturers and
more to come in the future.
• Open source.
Proceedings of IRAJ International Conference, 21st July 2013, Pune, India, ISBN: 978-93-82702-22-1
61
Oscilloscope On Android Phone
CONCLUSION
In this way we can implement this system
with the help of android mobile operating system. So
that we can design our objective ie.oscilloscope on
android phone which becomes the handy oscilloscope
With the help of this system we can saved
the o/p of different kind of waveshaping Signal in the
mobile system. For eg. Sine wave, sequre wave .
REFERENCE
[1] Android Platform Official Site, http://www.android.com/
[2]
Open
Mobile
Alliance
Official
http://www.openmobilealliance.org/
[3]www.google.com
[4]www.wikipedia.com
[5]www.android.com
[6 ]www.ieee.com

Proceedings of IRAJ International Conference, 21st July 2013, Pune, India, ISBN: 978-93-82702-22-1
62
Site,