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VOICE CONTROLLED WHEELCHAIR - PowerPoint PPT Presentation


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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. ECU032/48

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voice controlled wheelchair

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. ECU032/48

SAPNA VASUDEVAN ECU032/32

TINTU MARY SCHARIH ECU032/

SENTHIL KUMAR ECU032/

PRIYANKA SUSAN GEORGE ECU032/

slide2
AIM:
  • The project aims at controlling a wheelchair by means of human voice.
  • PIC 16F877 is the brain of the control circuit.
  • The voice recognition is done by HM2007.
slide3
DC motors are used to drive the wheelchair.
  • The driving mechanism used is chain drive.
  • Two 12V,32Ah maintenance-free, lead acid batteries are used.
block diagram

DRIVER

CIRCUIT

RIGHT

MOTOR

MIC

RESET

BATTERY

CHARGER

VOICE RECOGNITION IC

MICROCONTROLLER

BATTERY

SPEED &DIRECTION

CONTROL

DRIVER

CIRCUIT

LEFT MOTOR

BLOCK DIAGRAM
features of hm2007
FEATURES OF HM2007
  • It is a 48 pin DIP IC.
  • Speaker independent mode was used.
  • Maximum of 40 words can be recognized
slide7
Each word can be maximum 1.92sec long.
  • Microphone can be connected directly to the analog input.
  • 64K SRAM, two 7 segment displays and their drivers were connected.
training process
TRAINING PROCESS:

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.
slide11
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.
slide12
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
PCB- Key Board

Component Side

Soldering Side

voice recognition circuit on bread board
Voice Recognition Circuit on Bread Board
  • The circuit worked
  • well on bread board
  • PCB Design is over.
  • Soldering remaining
problems encountered
Problems Encountered:
  • There were many basic mistakes in the the application circuit in the datasheet itself.
  • 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.
slide16
Interfacing of 74LS373 with HM6264-Many Wrong Connections.
  • Interfacing 74LS47 with 74LS373-Many Wrong connections
  • One of the common anode 7-segment drivers was damaged.
motors and batteries
MOTORS AND BATTERIES:
  • 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
Power calculations
  • Trial1- m=40kg

s=5.321mt=15ss=ut+0.5at2therefore, a=0.047m/s2

v=0.705m/s

  • Trial 2- m=40kg

s=5.321mt=14ss=ut+0.5at2therefore, a=0.054m/s2

v=0.7601m/s

  • Trial 3-m=40kg
  • s=5.321mt=7ss=ut+0.5at2therefore, a=0.21m/s2
  • v=1.52m/s
motor calculations
MOTOR CALCULATIONS
  • R=0.3ma=0.21 m/s2 (maximum possible practically)v (max)=2m/sm=100kg takenF= ma + μN=21+0.04*900=57Nnote:0.02 is the frictional co- efficient for a smooth surface..0.04 is the roughest possible.900N is taken as a std valueP=F*v (max)=114W,both motors….57W one motor……Τ = F* R=57*0.3=17.1Nm

To find rpm of motor

t=7ss=5.321mv=1.52rpm=(s*60)/(2*3.14*R*t)=26rpm

now,

s=5.321mv=v (max)=2m/sfrom v2=2as, a=0.375m/s2from, 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

things to do
THINGS TO DO:
  • Programming of PIC16F877
  • Motors to be coupled to the wheel chair by chain drive mechanism.
  • Design of the speed and direction control circuit.
  • Design of battery charger.