1. THE EVERYTHING FINDER GROUP 3 CARLOS HERNANDEZ (CpE)
MICHAEL PAPANIA (CpE)
E. TIMOTHY ARIES (EE)
CHAIMAE JAAFAR (EE) 1

2. Motivation Average American spends:
5 minutes a day looking for mobile phone
6 minutes a day looking for keys in the morning
4 minutes a day spent looking for favorite sunglasses
On average we spend 30+ minutes a day looking for misplaced items hours a year ( According to research conducted by the Bureau of Labor Statistics)
Losing Items causes unnecessary stress and COSTS TIME 2

3. Goals and Objectives
Provide the user with a system that seemingly combines a smart phone application and portable tracker
System application that has several different modes of operation, which include findMe, rememberMe , and findPhone modes.
System hardware that ease the user of finding items through audio and visual indicators
Overall System that supports two way communication between the tracker and the mobile phone 3

4. Overview of the Everything Finder
FindMe mode
RollCall mode
FindPhone mode
RememberMe Mode

5. Design Specifications
Measurements
Tracker Size
2” x 2” x 0.5”
Tracker Weight
<= 12 Oz
Tracker Wireless Range (BLE)
>= 10 Feet
Audio Indicator (Buzzer)
2.731 KHz
80 3.6V
Visual Indicator (LED)
27000 MCD
Rechargeable Battery
300 ~500 Charge Cycles
Number of trackers supported per account
>= 3 5

6. Overall Block Diagram 6

7. Rechargeable Battery Compatible with small lightweight devices
High energy density ~200Wh/L
Built in safety vent
80% Capacity after 500 charge cycles
Typical Capacity of 120mAh
Weight of Bare Cell ~5.5g (~0.1 Lbs)
Low Internal Impedance <400mOhms

8. Charging Management High accuracy preset voltage regulation +/-0.75%
Constant-current/constant voltage charge algorithm
Voltage Regulation of 4.2V
Thermal Regulation
Programmable Charge Current up to 500mA
Automatic power down and recharge
Battery detection
Size 5-lead SOT-23 package

9. Charging Management Schematic/Prototype

10. Power Saving Management
Input Voltage Range 1.9~ 3.9V
Typical 30nA Ultra Low-Power Bypass mode
Automatic transition from DC- DC to bypass Mode
95% DC-DC efficiency
Up to 3-MHz switch frequency
Fixed voltage 2.1V on mode
Size 1x 1.5 x0.6 mm^3 USON Package

11. Power Saving Schematic/Prototype

12. System on Chip CC2540
The CC2540 is a single chip BLE solution that can run application and BLE protocol stack.
Requires a few external components
Microcontroller: High-Performance and Low-Power 8051
In-System-Programmable Flash 256 KB
Wide Supply Voltage Range (2 V–3.6 V)
Small size 6-mm × 6-mm QFN40 Package
21 General-Purpose I/O Pins (19× 4 mA, 2×20 mA)

13. System on Chip CC2540 (cont.)
Power Mode
Current Draw
Active Mode RX
Down 19.6 mA
Active Mode TX
24 mA
Low Power Mode 1
235 μA
Low Power Mode 2
0.9 μA
Low Power Mode 3
0.4 μA

14. System on Chip CC2540 (cont.)
Another way to save battery life will be through the use of the TPS62730.
Allows for saving up to 20 percent of battery life during RX and TX.
The TPS6273 is controlled by a GPIO pin on the SoC.
During RX and TX the SoC commands the TPS into low power mode.

15. System on Chip CC2540(cont.)
CC2540 Action
Without TPS62730
Low Power in Active Mode(with TPS62730) RX
Down 19.6 mA
Down to 15.8 mA TX
24 mA
18.6 mA
Before attempting to RX or TX the TPS62730 is set to Low Power mode by setting the ON/Bypass to high.
Once in Low Power Mode, the TPS steps down the input voltage to the SoC to 2.1 V which helps save about 20% of battery life.
When the On/Bypass pin of TPS is se to low, the chip delivers battery voltage to the SoC.
When the battery voltage reaches 2.2 V the TPS goes into automatic bypass mode and no longer able to go into low power mode.

16. System on Chip CC2540(cont.)

17. Indication Subsystem
The EverythingFinder will be able to aid the user in finding their item in two ways:
Visual indication
Audio indication
The user can choose what type of indication they want through the application.
Buzzer -Peak-Peak Signal Buzzer Single Tone 2.731kHz Magnetic 2.5 ~ 4.5V 3.6V, size = 10cm. Using SoC timer to drive.
LED- Luminous Intensity: 27000mcd 20mA

18. Battery Monitoring Subsystem
The SoC will be used to monitor the status of the battery.
Accomplished by using a voltage divider that is controlled by the SoC and the output of the circuit is “BATTMON_TPB” goes to the ADC for processing.
Status is sent to phone application.

19. CC2540 SoC Schematic/Prototype

20. Embedded Software
·Monitor for incoming role call events which the main application processes periodically to account for all user trackers.
·Monitor for incoming communications with the main application attempting to locate tracker. (communication indicating what kind of indication to output for the user).
·Enter low power and power saving mode when not in use.
· Monitor for interrupts: push button and timers.
·Monitoring battery life and communicating with the main application battery life status.
·Provide visual and audio indication to the user when instructed to do so by the main application.

21. Tracker Use Case Diagram

22. Printed Circuit Board
The components selected for the EverythingFinder’s design consists of a variety of surface and through hole mounted components
Many components chosen are the smallest or close to smallest available
Size constraints: The printed circuit board must be able to fit in a 2” x 2” enclosure
Mounted components must be no higher than 0.5”
The freeware version of Eagle is limited by 2 layers
The EverythingFinder will feature a trace antenna
Circuit Board must be water resistant

23. Printed Circuit Board - Challenges
Learning the software
It is difficult to fit all of the components into a tiny area and still have enough room for the wire traces
Routing by hand is time consuming
Several revisions and different layouts have been made
Even if certain components (battery, buzzer, etc) are to be mounted on the other side of printed circuit board, it is still larger than 2”x 2”
The smallest board designed in Eagle to date is 2.2” x 2.45”

24. Printed Circuit Board - Current Rev 9/8/16

25. Printed Circuit Board - Current Rev 9/8/16

26. Printed Circuit Board - Solutions and Goals
Experiment with other layouts in attempt to achieve the ideal size and the neatest layout
Possibly change size constraints if constraint is not achieved by mid-September
Printed Circuit Board design is to be completed by end of September
Ordered by the first week of October to allow time for testing and redesign
Once satisfied with results of testing and the PCB, more will be ordered to prove EverythingFinder concept

27. Everything Finder Use Case Diagram

28. Android Software Application
Android Studio development environment used
Main Menu includes: Register Device Button, Show Map Button, List of Currently Registered Devices
Register Device Button causes a menu to show that allows for registration of nearby Bluetooth devices using Android APIs. Data is saved as object and saved into list of registered devices
Show Map Button brings up map implemented using Google Maps API that has markers for last known locations of all registered Everything Finder devices
List allows for scrolling and for pressing on an item to show options for that device, which include unregister device and options for alerts via devices.

29. Phone Application Layout
Function Number
Function Name 1
Battery Status 2
Settings 3
Find Tracker 4
Add/ Remove Tracker

30. Phone Application Layout (cont)

31. Project Distribution

32. Work Distribution (cont.)
Power
MCU
Application
PCB
Primary
Chaimae
Carlos
Michael
Tim
Secondary

33. Budget and Financing $236.92 Cost ($) Quantity Price ($) Supplier
Total 50 1
Texas Instument 25
100
0.25
Digi-Key
Electronic Components
2.3 5
0.46
Micro-USB
12.5
2.5
Adafruit
Tactile Button Switch
17.9 10
1.79
Battery Holder
14.42 7
2.06
Digi-key
Buzzer
14.8 20
0.74
LedSupply
LED white and red
2.8
0.56
Microchip
Charging Controller MCP73831 14
1.4
Texas Instrument
Step Down Converter TPS62730
3.1
0.62
Chip Antenna
50.6
5.06
CC2540 System On Chip
29.5
2.95
BatteryMart
LIR2450 Battery
Cost ($)
Quantity
Price ($)
Supplier
Components
Evaluation Board TPS62730

34. Design Progress

35. Immediate Plan

36. Immediate Plan (cont)

37. Questions?