Presentation on theme: "ELECTRONIC STICK FOR BLIND PEOPLE Submitted By N. Jayaprakash Under guidance of."— Presentation transcript:
ELECTRONIC STICK FOR BLIND PEOPLE Submitted By N. Jayaprakash Under guidance of
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
BLOCK DIAGRAM OF PROJECT Control Circuit Buzzer Battery Sensor circuit Regulated Supply Block diagram of project
MAJOR COMPONENTS INFORMATION Integrated Circuit 555 Light Emitting Diode (LED) TSOP 1738 IR receiver Comparator Voltage Regulator
INTEGRATED CIRCUIT 555 Pin diagram of IC 555 Block schematic of IC VCC DISCHARGE THRESHOLD CONTROL VOLTAGE RESET OUTPUT TRIGGER GND IC 555
LIGHT EMITTING DIOD Parts of a LED 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
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.
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
CIRCUIT DESIGN AND OPERATION v cc 230V AC 7805 IN4007 2K 47µF 100µF 47µF REGULATED POWER SUPPLY CIRCUIT
CIRCUIT DIAGRAM AND ITS OPERATION v cc 230V AC LM7805 IN4007 2K 47µF 100µF 47µF IC 555 v cc A nF 100E 220E 1K5 10nF TSOP O/P v cc Buzzer IC K v cc TSOP O/P 470E 100µF
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.
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.
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.
Transformer Rectifier FilterRegulator 5V DC 230V AC BLOCK DIAGRAM OF POWER SUPPLY Block diagram of power supply
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 +.