Transcript VOICE CONTROLLED WHEEL CHAIR

VOICE CONTROLLED WHEELCHAIR
PROJECT GUIDE: Mr. RAJESH M.V
Sr. LECTURER IN ELECTRONICS & COMM
PROJECT CO-ORDINATOR: Mrs. JIBI JOHN
Sr. LECTURER IN ELECTRONICS & COMM
Website: www.techtriks.wordpress.com
Team Members
NISHA M.S.
SAPNA VASUDEVAN
TINTU MARY SCHARIH
SENTHIL KUMAR
PRIYANKA SUSAN GEORGE
ECU032/48
ECU032/32
ECU032/
ECU032/
ECU032/
AIM:
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The project aims at controlling a wheelchair
by means of human voice.
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PIC 16F877 is the brain of the control circuit.
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The voice recognition is done by HM2007.
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DC motors are used to drive the wheelchair.
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The driving mechanism used is chain drive.
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Two 12V,32Ah maintenance-free, lead acid
batteries are used.
BLOCK DIAGRAM
MIC
VOICE RECOGNITION
IC
RESET
DRIVER
CIRCUIT
RIGHT
MOTOR
BATTERY
MICROCONTROLLER
SPEED &DIRECTION
CONTROL
DRIVER
CIRCUIT
LEFT MOTOR
BATTERY
CHARGER
VOICE RECOGNITION CIRCUIT
FEATURES OF HM2007
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It is a 48 pin DIP IC.
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Speaker independent mode was used.
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Maximum of 40 words can be recognized
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Each word can be maximum 1.92sec long.
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Microphone can be connected directly to the
analog input.
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64K SRAM, two 7 segment displays and their
drivers were connected.
PIN DIAGRAM
HM6264
CIRCUIT DIAGRAM
TRAINING PROCESS:
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VOICE TRAINING
Make WAIT pin HIGH for training mode.
Clear the memory by pressing 99 *.
Enter the location number to be trained.
After entering the number the LED will turn
off.
Number will be displayed on the display.
Next press # to train.
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The chip will now listen to the voice input and
LED will turn ON.
Now, speak the word you want to train into
the microphone.
The LED should blink momentarily.
This is the sign that the voice has been
accepted.
Continue doing this for different words.
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VOICE RECOGNITION
Repeat the trained word into the microphone.
If word is rightly recognized, the correct
location is displayed.
The error codes are:
55- word too long.
66-word too short.
77-word no match.
PCB- Key Board
Component Side
Soldering Side
Voice Recognition Circuit on Bread Board
• The circuit worked
well on bread board
• PCB Design is over.
• Soldering remaining
Problems Encountered:
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There were many basic mistakes in the the
application circuit in the datasheet itself.
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The CHIPSELECT of SRAM(PIN26)is an
active high input, we tied it to ground through
a capacitor and resistor as indicated in the
application circuit.
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Interfacing of 74LS373 with HM6264Many Wrong Connections.
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Interfacing 74LS47 with 74LS373-Many
Wrong connections
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One of the common anode 7-segment
drivers was damaged.
MOTORS AND BATTERIES:
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After calculations the following motor
specifications were arrived at: 57W, 17.1Nm,
30 rpm.
The motor procured from AGNI
MOTOR,BANGLORE has the following
specifications:120W,9.8Nm,60 rpm with no
load.
Two 12V,32Ah lead acid AMARON batteries
were purchased
Power calculations
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Trial1- m=40kg
s=5.321m
t=15s
s=ut+0.5at2
therefore, a=0.047m/s2
v=0.705m/s
Trial 2- m=40kg
s=5.321m
t=14s
s=ut+0.5at2
therefore, a=0.054m/s2
v=0.7601m/s
•Trial 3-m=40kg
s=5.321m
t=7s
s=ut+0.5at2
therefore, a=0.21m/s2
v=1.52m/s
MOTOR CALCULATIONS
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R=0.3m
a=0.21 m/s2 (maximum possible
practically)
v (max)=2m/s
m=100kg taken
F= ma + μN=21+0.04*900=57N
note:0.02 is the frictional coefficient for a smooth surface..0.04
is the roughest possible.900N is
taken as a std value
P=F*v (max)=114W,both
motors….57W one motor……
Τ = F* R=57*0.3=17.1Nm
To find rpm of motor
t=7s
s=5.321m
v=1.52
rpm=(s*60)/(2*3.14*R*t)=26rpm
now,
s=5.321m
v=v (max)=2m/s
from v2=2as, a=0.375m/s2
from, v=at, we get t= 5.5s
Therefore,
rpm=(s*60)/(2*3.14*R*t)=31rpm
finally, each motor should at least
be 60W,100rpm
Flowchart
THINGS TO DO:
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Programming of PIC16F877
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Motors to be coupled to the wheel chair by chain
drive mechanism.
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Design of the speed and direction control circuit.
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Design of battery charger.
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THANK YOU