WI-FI Based Wireless Datalogger - International Journal of Science

WI-FI Based Wireless Datalogger - International Journal of Science
International Journal of Science and Research (IJSR)
ISSN (Online): 2319-7064
Index Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438
WI-FI Based Wireless Datalogger
Vikram Kamadal1, Manjula N Harihar2
1, 2
School of Engineering, Jain University, Bangalore, India
Abstract: This paper aim is to develop a Wi-Fi based wireless Datalogger through which we can measure any physical or
environmental parameters like temperature, pressure, current, water level, soil moisture, rainfall, wind speed and direction, pulse signals
etc, and store the data for a period of time. Data loggers can record a wide variety of energy and environmental measurements including
temperature, relative humidity, AC/DC current and voltage, differential pressure, light intensity, water level, soil moisture, rainfall, wind
speed and direction, pulse signals etc. During configuration the datalogger is physically connected to the PC and search for an existing
wireless network so that it can be placed anywhere within range of the network. Our developed system measures different physical
parameters and retain them for a period of time using datalogger shield which is connected to PC through wireless with the aid of Wi-Fi
shield. The Wi-Fi shield used here is Tinysine Wi-Fi shield and it’s based on roving networks RN-XV module. It provides the bridge
between TTL serial port and IEEE802.11b wireless communication network, which helps to connect the entire setup wirelessly to the
PC. This system is portable and easy to handle for recording all the physical or environmental parameters and storing it for a period of
time.
Keywords: Datalogger, Wi-Fi, RN-XV, TTL, SD, PC, TCP, VI.
1. Introduction
In earlier days there is lack of device where we can use a
single system in real time to monitor and store the different
physical or environmental parameters like temperature ,
pressure, etc. Hence we developed a system using
Datalogger to monitor and store the parameters. Datalogger
is an electronic device that records various data over time.
The datalogger is generally portable, battery powered,
internal memory for data storage and equipped with a
microprocessor and sensors. Some data loggers interface
with a personal computer and utilize software to activate the
data logger and view and analyze the collected data. One of
the primary benefits of using data loggers is the ability to
automatically collect data on a continuous basis. Data
loggers are typically deployed and left unattended to
measure and record information for the duration of the
monitoring period. This allows for a comprehensive,
accurate idea of the environmental conditions being
monitored, such as air temperature and relative humidity.
temperature, pressure, altitude etc for a period of time.
During configuration phase, the data logger will search for a
wireless network while it is physically connected to the PC.
Once wireless network is available then be can be placed
anywhere within range of the network.
2. WI-FI based Datalogger
The data logger is connected to a PC via a USB interface.
The data logger software is used to select logging
parameters (sampling intervals, start time, etc.) and activate
the logger. Wi-Fi system 802.11b, Arduino UNO with
ATmega328 and data logger is used to developed a system.
The simulated result is obtained by using NI-LabVIEW
software and Arduino IDE software. The LabVIEW is the
graphical programming language through which the
different virtual instrumentation(VI) can be built for
different sensors and the output of the sensors will be stored
in the datalogger shield which has SD card within it later it
is wirelessly connected to the PC by creating the TCP
sessions.
We developed a Wi-Fi based wireless data logger through
which we measured and monitored a parameters
Figure 1: Proposed block diagram
Paper ID: SUB157472
Volume 4 Issue 8, August 2015
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
943
International Journal of Science and Research (IJSR)
ISSN (Online): 2319-7064
Index Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438
The above figure-1 shows the block diagram for the whole
system where different sensors like temperature, pressure,
proximity and altitude are connected to the ATmega328
microcontroller. The datalogger shield is connected to
ATmega328 and on top of it the tinysine Wi-Fi shield,
which has been connected wirelessly to the PC which
creates putty session and hence all the required parameters
are read successfully.
precision digital pressure sensors for consumer applications.
The ultra-low power, low voltage electronics of the BMP180
is optimized for use in mobile phones, PDAs, GPS
navigation devices and outdoor equipment. With a low
altitude noise of merely 0.25m at fast conversion time, the
BMP180 offers superior performance. The I2C interface
allows for easy system integration with a microcontroller.
Through this the pressure values can be read easily.
3. Hardware Implementation
Proximity sensor
Here the proximity sensor is used to detect the metals. In
proximity sensor there are few types that is capacitive
proximity, inductive proximity, photoelectric proximity, IR
proximity type. In this system the inductive type proximity
is used. Where it help to detect the metal and the capacitive
type detects non metallic things like plastic, wooden
materials. The inductive proximity sensor have the sensing
range from 3mm to 60mm it comes with different type of
inductive sensors.
A. Adafruit datalogger
Here we are using the Adafruit datalogger [11] where this
device can be used to log the different parameters. Latest
version of this popular shield has all the features of the
popular original, but comes pre assembled. Saving data to
files on any FAT16 or FAT32 formatted SD card, to be read
by any plotting, spreadsheet or analysis program. This will
also show us how to use two free software programs to plot
our data. This has Real Time Clock timestamps so all our
data with the current time, so that we know precisely what
happened when! The data logger is a reliable, well-rounded
and versatile design. It is easily expanded or modified and
come well supported with online documentation and
libraries. The figure-2 shows the datalogger shield. Through
this we can store the data with time and date stamp. SD card
interface works with FAT16 or FAT32 formatted cards. 3.3v
level shifter circuitry prevents damage to your SD card. Real
time clock (RTC) keeps the time going even when the
Arduino is unplugged.
C. Tinysine Wi-Fi shield
Tinysine Wi-Fi shield[12] based on Roving Networks RNXV module. It can be separate two parts – Tinysine Bee
shield and WiFiBee module. It provides the bridging from
TTL serial port communication to IEEE802.11b wireless
communication. So any device with TTL serial ports can
easily be connected with this Wi-Fi shield and controlled
and managed remotely through a wireless network. Different
kinds of communication protocols and encryption algorithms
are integrated with the module figure 3 represent the Wi-Fi
shield.
Figure 3: Tinysine Wi-Fi shield
Figure 2: Datalogger shield
4. Results
B. Sensors
LM35 Precision Centigrade Temperature Sensor
The LM35[11] series are precision integrated-circuit
temperature devices with an output voltage linearlyproportional to the Centigrade temperature. LM35 device
has an advantage over linearly- proportional to the
Centigrade temperature. The LM35 device has an advantage
over linear temperature sensors calibrated in Kelvin, as the
user is not required to subtract a large constant voltage from
the output to obtain convenient Centigrade scaling. The
LM35 device does not require any external calibration or
trimming to provide typical accuracies of ±¼°C at room
temperature and ±¾° Cover a full −55°C to 150°C
temperature range.
BMP180 Pressure Sensor
The BMP085[13] is the fully pin and function compatible
successor of the SMD500, a new generation of high
Paper ID: SUB157472
A. Virtual instrumentation for Wi-Fi configurations
Figure 4: Wi-Fi configurations
Volume 4 Issue 8, August 2015
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
944
International Journal of Science and Research (IJSR)
ISSN (Online): 2319-7064
Index Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438
The above figure-4 virtual instrumentation (VI) represents
the Wi-Fi configuration through the TCP blocks that is TCP
initialize to which the address is given as 1.2.3.4 and 2000 is
service name or the remote port then the TCP read block is
connected to which the output block is connected and at the
last the TCP close block is connected to close the session.
C. Output for Proximity sensor
Figure 5: Front panel with output
In figure-5 shows the front panel with the desired output
where different parameters are read successfully.
B. Virtual instrumentation for Digital sensor
The above table shows the output for the Proximity sensor.
In case of metal detection the output will be binary 1 or else
output will be binary 0 in case of no metal detection with
time stamp in the excel sheet.
5. Conclusion
Figure 6: VI for digital sensor
In figure- 6 the VI is been created for digital sensor where it
represents the different blocks like initialize block, digital
read to which the digital channel select block is connected at
the input side and the output block is connected at the output
side in the form of write measurement file to excel sheet
finally the while loop is closed by using the close block.
Paper ID: SUB157472
In this paper we present a new and precise temperature,
pressure, humidity etc measurement system, by using
wireless communication module, realizing wireless
transmission is simpler but also low cost, high reliability,
easy maintenance and less interference in transmission etc.
By the help of this system we can log the different physical
parameters and store the data for several days. This system
is very effective where continuous monitoring of different
parameters should be carried out. From this project we can
even calculate the energy consumption that is by connecting
the voltage and current sensor so that we can calculate the
power and energy consumption. This system can even used
as GPS for location finding with using altitude values.
References
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Volume 4 Issue 8, August 2015
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
945
International Journal of Science and Research (IJSR)
ISSN (Online): 2319-7064
Index Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438
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Paper ID: SUB157472
Volume 4 Issue 8, August 2015
www.ijsr.net
Licensed Under Creative Commons Attribution CC BY
946
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