VOICE CONTROLLED WHEELCHAIR

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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 SAPNA VASUDEVAN
ECU032/32 TINTU MARY SCHARIH
ECU032/ SENTHIL KUMAR
ECU032/ PRIYANKA SUSAN GEORGE ECU032/
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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.

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• 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.

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BLOCK DIAGRAM
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• VOICE RECOGNITION CIRCUIT

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FEATURES OF HM2007

• It is a 48 pin DIP IC.
• Speaker independent mode was used.
• Maximum of 40 words can be recognized

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• 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.

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PIN DIAGRAM
HM6264
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CIRCUIT DIAGRAM
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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.

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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.

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PCB- Key Board
Component Side
Soldering Side
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Voice Recognition Circuit on Bread Board

• The circuit worked
• well on bread board
• PCB Design is over.
• Soldering remaining

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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.

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• 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.

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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 specifications120W,9.8Nm,60 rpm
  with no load.
• Two 12V,32Ah lead acid AMARON batteries were
  purchased

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Power calculations

• Trial1- m40kg
• s5.321mt15ssut0.5at2therefore,
  a0.047m/s2
• v0.705m/s
• Trial 2- m40kg
• s5.321mt14ssut0.5at2therefore,
  a0.054m/s2
• v0.7601m/s

• Trial 3-m40kg
• s5.321mt7ssut0.5at2therefore, a0.21m/s2
• v1.52m/s

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MOTOR CALCULATIONS
To find rpm of motor t7ss5.321mv1.52rpm(s6
0)/(23.14Rt)26rpm now, s5.321mvv
(max)2m/sfrom v22as, a0.375m/s2from, vat,
we get t 5.5s Therefore, rpm(s60)/(23.14Rt)
31rpm finally, each motor should at least be
60W,100rpm

• R0.3ma0.21 m/s2 (maximum possible
  practically)v (max)2m/sm100kg takenF ma
  µN210.0490057Nnote0.02 is the frictional
  co- efficient for a smooth surface..0.04 is the
  roughest possible.900N is taken as a std
  valuePFv (max)114W,both motors.57W one
  motor? F R570.317.1Nm

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Flowchart
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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.

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• THANK YOU

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