Everybody talks about futuristic things is must be. But one you can't for see the future, how would you react. If your eye's, suddenly go blind. What will you do? But blind people never react because they are blind from the beginning. they struggle every day will this problem. The most important problem is migration. but don't worry about that guy's dark light will help you, some object will be in front of you that you will know even through Dark Light

Step 1: Required Materials

# Arduino nano

amazon link: https://amzn.to/2FZMVCN

# SD card module

amazon link: https://amzn.to/2XwQawi

# Ultrasonic sensor

amazon link: https://amzn.to/2JkTW3c

# lithium iron battery

amazon link: https://amzn.to/2FXqgH4

# lithium-ion battery charging module

amazon link: https://amzn.to/2G1dZBt

# headphone holder

#SD card

amazon link: https://amzn.to/2FYHaFt

# switch

amazon link: https://amzn.to/2FZm9dE

Step 2: How to Achieve This

At first, take the Arduino nano and Ultrasonic sensor. then combine these two and check it properly by testing it.it will work properly,

The second step in to attach the Arduino nano with the sd card module and insert the sd card. to check it's working, play some audio files. It will play if your circuit is completely alright.

ok let's combine these two projects in one

Step 3: Preparing the Audio

normal audio file can't play so, we make some configuration move to ONLINE-CONVTER

Change bit resolution: 8bit

Change sampling rate: 16000

Change audio channels: mono

Step 4: Cheak SDcard Module

Description

SD Card is used for transfering data to and from a standard sd card. The pin out is directly compatible with Arduino and also can be used with other microcontrollers

SDcard module

This module uses the standard SPI interface for communication, which involve SPI buses, MISO, MOSI, SCK, and a CS signal pin.

#CS (chip select)

#SCK (serial clock)

#MOSI (master out slave in)

#VCC (3.3V or 5V)

#GND (ground)

Diagram

Connect VCC with 5V in the Arduino.

Connect the GND of SD card to the ground of Arduino.

CS to pin 14

SCK to pin 13

MOSI connect to the pin 11

MISO to pin 12

sd_card_module.ino
Download

Step 5: Cheak the Ultrasonic Sensor

Description

ultrasonic sensor uses sonar to determine distance to an object like bats do. It offers excellent non-contact range detection with high accuracy and stable readings in an easy-to-use package. It comes complete with ultrasonic transmitter and receiver

Features
#Power Supply :+5V DCQuiescent Current :

#<2mAWorking Current:

#15mAEffectual Angle:

#<15°Ranging Distance :

#2cm – 400 cm/1″ – 13ftResolution :

#0.3 cmMeasuring Angle:

#30 degreeTrigger Input Pulse width:

#10uSDimension: 45mm x 20mm x 15mm

How Does it Work?
The ultrasonic sensor uses sonar to determine the distance to an object. Here’s what happens: The transmitter (trig pin) sends a signal: a high-frequency sound.When the signal finds an object, it is reflected and,the transmitter (echo pin) receives it.

ultrasonic.ino
Download

Step 6: How It Works

Now ultrasonic sensor can sense up to 105 meters,almost 5 feet distance. measure the length of the blind people's step in centimeter create or set the coding based on the calculation, Now fix the headset and handle it properly.if an object is in front of the people, it will play audio. it says"one foot" or "four feet" etc...if nothing in the way its play "root clear".