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ELECTRONIC STICK FOR BLIND PEOPLE

ELECTRONIC STICK FOR BLIND PEOPLE. Submitted By N . Jayaprakash. Under guidance of. D. Sudhakar Asst. Professor Co- ordinate. V. Anusha Asst. Professor Internal guide. INTRODUCTION.

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ELECTRONIC STICK FOR BLIND PEOPLE

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  1. ELECTRONIC STICK FOR BLIND PEOPLE Submitted By N. Jayaprakash Under guidance of D. Sudhakar Asst. Professor Co- ordinate V. Anusha Asst. Professor Internal guide

  2. INTRODUCTION • The main aim of this project is to detect the obstacle in front of the electronic stick and giving the alarm • This will assist the blind persons during the walk and provides an alarm if any hurdle is detected with-In the set range • This system mainly consists of a regulated power supply, IR transmitter, IR receiver, control circuit and the output driver circuit • The IR sensor detects the presence of an obstacle in front of the person

  3. BLOCK DIAGRAM OF PROJECT Battery Regulated Supply Buzzer Control Circuit Sensor circuit Block diagram of project

  4. MAJOR COMPONENTS INFORMATION • Integrated Circuit 555 • Light Emitting Diode (LED) • TSOP 1738 IR receiver • Comparator • Voltage Regulator

  5. INTEGRATED CIRCUIT 555 8 VCC GND 1 DISCHARGE 7 TRIGGER 2 IC 555 6 THRESHOLD OUTPUT 3 CONTROL VOLTAGE 5 4 RESET Pin diagram of IC 555 Block schematic of IC555

  6. LIGHT EMITTING DIOD • A light-emitting diode (LED) is a semiconductor diode that emits incoherent narrow spectrum light when electrically biased in the forward direction of the pn-junction Parts of a LED

  7. TSOP 1738 IR RECEIVER • This Tsop 1738 work as reciever • Receives modulated infrared signal and converts into electrical signal. • If IR LED (reciever) detects any hurdle in between of its line of sight communication then voltage across its output get low. • If IR LED (reciever) does not detect any hurdle in the way of its line of sight communication then voltage across it remains high.

  8. BUZZER

  9. COMPARATOR • In our project we have used IC LM319 • The LM319 is a dual high speed voltage comparator designed to operate from a single + 5V supply up to ±15V dual supplies • All pins of any unused comparators should be tied to the negative supply.   • The LM319 series are high gain, wide bandwidth

  10. CIRCUIT DESIGN AND OPERATION 7805 REGULATED POWER SUPPLY CIRCUIT 1 vcc 3 IN4007 IN4007 2 2K 47µF 230V AC 100µF 100µF 47µF IN4007 IN4007

  11. vcc vcc CIRCUIT DIAGRAM AND ITS OPERATION vcc vcc vcc 220E A 8 4 7 LM7805 11 vcc 4 Buzzer 100E IC 555 1 vcc 3 IC 319 1K5 10K 3 IN4007 547 vcc 6 IN4007 12 TSOP O/P 2 5 2K 47µF 230V AC TSOP 8 6 10 3 470E 100µF 100µF 2 1 5 47µF IN4007 2 1 3 100µF 10nF 10nF IN4007 O/P

  12. ADVANTAGES • Multiplexers are used to sense obstacles in different directions simultaneously. This means, the blind person might receive different signals on obstacles in different directions around him. • The moisture sensing electrodes sense the moist soil or stagnant water. This can be especially helpful during the rainy season. It also contains micro-switches, to detect manholes.

  13. FUTURE SCOPE • Technology created reading machines, talking books, and computers that translate Braille. • Communications technologies were easier to invent and consequently were brought to market • Technologies available for blind navigation are insufficiently developed, adapted, and marketed.

  14. CONCLUSIONS • Electronic walking stick for blind people helps the blind people when the obstacle occurs at in front the person. • The stick gives signal to the person by buzzer sound or vibration when it detects the obstacle. • Without the help of any other person the blind people can walk easily.

  15. BLOCK DIAGRAM OF POWER SUPPLY 5V DC 230V AC Filter Regulator Transformer Rectifier Block diagram of power supply

  16. INTEGRATED CIRCUIT 555 • IC555 timer IC along with Infra red LED which is going to transmit signal • This IC consists of two comparators that drive the set(S) and reset(R) terminals of a flip flop. • The Q output is available as the overall output. Q' drives the discharge transistor • The reference voltage of comparator 1 is fixed at (2/3)V+ and that of comparator 2 is fixed at (1/3)V+.

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