This device is mainly prepared based on the concept of time delays. It
perform actions. Based on the time delays. User can do program on this device
and he can give values of time delays as His requirements. By using this device
one can write program to operate a robot. One can use this Device for operate
devices which are working upon time delays. It operates without the help of
processor.
TEAM:
1. SRINIVAS
2. GANESH
3. BHARATH
4. BHAVANI
we won consolation prize for this project at TECHNO GRAIL conducted by
ANDRA UNIVERSITY COLLEGE
OF ENGINEERING in hardware context.
DEVICES:
OSCILLATOR & CLOCK GENERATOR:
The oscillator
produces oscillations for giving input to clock generator. The clock Generator produces
clocks for giving input to counter. Counter will increments its value by
these Clock pulses. Here 555 timer used for the producing clock
pulses.
COUNTER:
Counter will
increments its values
by clock pulses
given by clock
generator.The delay time is decided by
counter value ( Output of
counter is delay
time) .Here 4020 , 4520, 4529 counters are used.
MEMORY:
Here SRAM are
used as memory. The delay times given by user is stored into Memory. These values go to input to COMPARATOR.
Here HY6264A used for the memory.
COMPARATOR:
It compares the values from
memory and counter. If they are equal then it Sends an ACTIVATION
signal to decoder which locates
the address of
output device. Here 74ls85 As comparator
OUTPUT DEVICES:
These devices
are activated by signal from decoder. Here for activating output devices JK flip
flops are used for
activating output device
and for storing output
signal until next Output signal comes.
WORKING:
1 Oscillator
produces oscillations to clock generator.
2 Clock
generator produces clocks for counters.
3 Counter
increments its value and given to comparator as input.
4 The delay
time value is fetched
from memory and
given as input to Comparator
5 The
comparator checks these values whether they are equal or not. If they
are equal then
it
sends a signal to activate output
device and a signal
to Increment address
location of SRAM
and a signal to reset pin of
counter.
6 Steps 1 to 5
will be
repeated until output
address is equal
to either 00000000 or 00000001
7 If
the output address is 00000000 the device operation is stopped. If the
output address is 00000001 then
operation will again
repeated from starting
given memory location.
BLOCK DIAGRAM:
COST EFFECTIVENESS:
1.The equipment necessary to build this circuit consists of
simple IC’s which are limited in number and
are of low cost.
2. since there is NO NEED of PROCESSOR we need not invest much money on this
equipment.
This timer is new and i want to saw the working of this kind of timer. But we can only do this in that time in which we are thinking about working of https://www.aussiewritingreviews.com/. And hence that is the good time for us because we need some new things for us.
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