Talking Smart Glass for the Blind

0 43530 Hard
1 Hardware components
3 Ultrasonic Sensor - HC-SR04 (Generic)
1 DFRobot DF Player mini
1 SparkFun Arduino Pro Mini 328 - 5V/16MHz
1 PCBWay Custom PCB
1 Custom PCB (JLCPCB)
1 3.5mm Audio jack
1 Vibration motor
1 Slide Switch

Software apps and online services

Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)




There are multiple smart accessories such as smart glasses, smartwatches, etc. available in the market. But all of them are built for us. There is a significant lack of technology to aid the physically challenged. I wanted to build something that is useful for the visually challenged people. So I designed low cost smart glass that can be used to help the visually impaired.

This project uses a few ultrasonic distance sensors, an Arduino Pro Mini, an MP3 player module, and some vibration motors. The circuit board used in this project is designed in the form of a spectacle, which can be worn by a visually impaired person. An Arduino mounted on the spectacle will detect the obstacle with the help of the sensors and notify the user through headphones and vibration motors.

Flash the Pro Mini

Connect the Pro Mini to the computer using FTDI cable.

Select proper COM port.

Select 'Arduino Pro or Pro Mini.'

Click upload

Make sure to flash Arduino before soldering it to PCB. Once all the components are soldered, it will be bit harder to connect the programming header.

Assembling the PCB

Solder the components like Arduino, DF Player, Audio jack, Slide Switches to the PCB first.

We can't directly solder the HC-SR04 module available from market. some modification need to be done.


Straighten the male header using a pliers or de-solder the 90° headers and solder normal headers.


Add electrical tape to tha back of HC-SR04 to avoid short circuit.

Insert HC-SR04 to designated solder pads. hold the left and right HC-SR04 at an angle and apply solder.

Solder rest of the components such as power supply cable, slide switches, vibration motors etc.

Copying Audio Files to the SD card

Copy content of the Audio files folder to the root of the SD card.

Copy folders (01, 02, 03) itself, not its content.

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