This document summarizes a project to develop a mobile application and tags to help visually impaired people locate lost objects. The main points are: 1) The project aims to develop a technological solution using a mobile app and tags to help visually impaired individuals locate frequently misplaced objects, as losing things is a common problem. 2) A questionnaire found that potential users would prefer an audio signal from tags over vibration and a mobile app over a separate device to locate objects. 3) Prototypes were developed using RFduino microcontrollers with Bluetooth, accelerometers, buzzers and batteries in 3D printed tags that can be attached to objects and located using the mobile app. 4) Future work includes reducing tag

1. CSP 315
Object locator
PNVR Koutilya
S.Rushikesh Reddy
Ch.vinay Reddy
Mvsk anirudh
P Pradeep varma
M Laxman

2. Objective
• Finding lost objects : common problem for
visually impaired
• Technological solution
• Mobile application

3. Questionnaire
• Gets frustated 5 to 6 times a day
• Audio device better than vibration
• Mobile app better than separate device

4. Mobile application
Tag1
Tag2
Tag3
Bluetooth
communication
BLOCK DIAGRAM

5. Bluetooth
module
Microcontroller Buzzer
Accelerometer
Rechargeable Battery
TAG

6. TAG
TAG:
• Rfduino- Microcontroller with Bluetooth module
• Buzzer(95dB)
• Rechargeable battery(3V)
• Accelerometer

7. Tag functioning
• Any query from mobile app is received by
Bluetooth module and then sent to micro-
controller
• Microcontroller processes the query and
activates the buzzer accordingly
• Until the tag is searched for, it stays in the
standby mode

8. Mobile App

10. RFDUINO
• A finger-tip sized, Arduino compatible, wireless
enabled microcontroller
• The RFduino is similar to the Arduino UNO or DUE,
except the RFduino has more power than the UNO,
in addition has wireless smartphone connectivity
built-in
• Adding wireless to an Arduino requires an additional
wireless shield which adds size. The RFduino has
wireless built-in, so there is no need for an additional
wireless shield.

11. RFDUINO
• The RFduino has a Nordic 32 bit ARM Cortex-M0
processor. It still runs the same, simple Arduino code
the UNO runs also run on the RFduino.
• It has a wireless module incorporating Nordic’s
nRF51822 SoC.

12. Rfduino is an open source!

13. Tag design
 Each tag contains an Rfduino
 Costs Rs.1200
 Contains unnecessary features
 PCB design of our own Rfduino with required
features
 Phase1: implementation on breadboard (using DIP ICs)
 Components:
 Atmega168
 16MHz Crystal
 RF Module
 Basic circuitry elements

14. Circuit Diagram

15. Lockable Tags
• Contains accelerometer
• When the tag is locked, any movement detected in
the accelerometer is sent to buzzer via
microcontroller

16. Bluetooth
module
Microcontroller Buzzer
Accelerometer
Rechargeable Battery
TAG

17. Future Scope
• Lockable Tags
• Reducing the cost of the tag
• Tag shape:
 We are trying to design the shape of the tag such that it can
be attached to different devices
• Testing the app:
 We will get feedback from users and try to make our device
more user friendly

18. FINAL DEMO
• Demonstration with tags based on RFDUINO
modules.
• Design of low cost tag on a PCB board

19. Thank you