28-09-2012, 10:56 AM
Low power microcontroller based intelligent token number speaker and display system
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Abstract
These People normally stand in a line to get service
in many public servicing places. People also face many
problems there. Because, People break their serials and create a
noisy situation. Our proposed device can overcome this
problem. Our proposed device can show any three digit number
from 0 to 999 and it can also speak this number. The voice of
this device is so clear that, anyone can listen and understand it
easily. Already we had known about such a device “Low Power
Microcontroller Based Simple Smart Token Number Display
System” which published in 2009 Fifth International
Conference on MEMS NANO By Mr.Rajesh Kannan
Megalingam. His device could show digit but could not speak
the number. But our proposed device can overcome this
problem.
INTRODUCTION
In a developing and populous country like Bangladesh, we
have to stand in a queue to get demandable services. Such as
in banks, hospitals, canteens etc. In the above mentioned
places the device of Rajesh Mr. Kannan Megalingam is an
essential device to keep discipline. But, in maximum cases
there are more than 99 people in the serial. Then his device
becomes poor. Regarding this problem, we have devised a
device which can show more digit number to serve this huge
number of people more comfortably. So, we have designed
the device to show three digits and our device has another
speciality to speak the number in the loud speaker. Mr.
Kannan Megalingam suggests to use ICs like SP0256 to
design the device. But, this Ic is not available in our country.
And this Ic is very costly. But we have designed the device
without using this type of voice synthesizer Ic. We have done
It using only an ATmega128 microcontroller Ic.
Display unit
In our project we used seven segment displays. We have
used two set of seven segment display. Operator display and
customer display. There are three seven segment in each set.
Seven segment displays contains seven LED bars. Seven
segment display are available in two types, called, ’common
cathode’ and ‘common anode’. In our project we used
‘common cathode ‘type display. We used CMOS 4026B to
control the seven segment display this system uses just two
pins to control the display. The reset is used to reset the
display to 0. The clock pin is then used to increment the digit
up from 0. This means to display the digit ‘3’ it is necessary
to reset and then pulse the clock line 4 times in reality this
means that the display shows the digits 0-1-2-3, but as they
are clocked extremely rapidly, the human eye cannot see
changes and the number ‘3’ seems to appear immediately.
This system can be expanded to three digits by adding a three
4026B IC and a three seven segment display.
CONCLUSION
We have designed a unique microcontroller based
intelligent token number speaker and display system
successfully. In many places we have noted that, a person is
sitting with a microphone to announce the number of the
display .But using our proposed device it can be done without
a person to speak in the token number. Another specialty of
our proposed device is that, it is possible to announce the
token number in any language changing the voice file to the
required language of the world without changing any
hardware. Our proposed device is cheaper and its required
power is very less. To make it user friendly we have kept only
two buttons (reset, next) to operate the device .Overall we are
very hopeful about our proposed device.