Microcontroller based Electronic Walking

Stick for Blind

By-Manav Mittal (07211503009)

Gunjan Saluja (07311503009)Surabhi Garhwal (09311503009)

Introduction

Presently, blind people use a white stick as a tool for directing them when they move or walk.

Here, we develop a tool which can serve as a blind stick being more efficient and helpful than the conventional one.

BASIC LOGIC

• Five different sensors with microcontroller interface are used.

• IC 89s51 as the main microcontroller is used.

Components

• Microcontroller 8951• Sensors• Remote• Buzzer

LDR

CON

TRO

L U

NIT

BLOCK DIAGRAM

LDR INPUT

INFRARED SENSOR INPUT

REMOTE SENSOR

THERMISTOR

WATER SENSOR

BLIND STICK WITH SENSORS

8951 Microcontroller

• Advance version of 8051

• Two types of 8951 are available-1. 89s512. 89c51

Sensors used-

• Temperature Sensor• Light Sensor• Infrared Sensor• Water Sensor

Light Sensor

Infrared Transmitter and Receiver

In the interruption mode we use one infra red led and photodiode in pair.

Temperature Sensor

• Thermistor is used• In case of high

temperature, the circuit is activated and the buzzer rings.

Water Sensor

•Impedance Moisture sensors are used.•For the water sensor we use two metallic plate under the stick ,when water touches on this stick then buzzer is on.

Remote Sensor

•TSOP 1738 sensor is used.• Photo Detector and preamplifier in one package.• Improved shielding against electric field disturbance.

Thank You !!