1. ECE477 MIDTERM DESIGN REVIEW: TEAM #08
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ECE477 MIDTERM DESIGN REVIEW: TEAM #08

2. OUTLINE Project Overview Major Components Block Diagram
Packaging Design
Electrical Schematic
PCB Layout
Prototyping Progress
Software Development Status
Project Timeline
Questions

3. PROJECT OVERVIEW
Glass is a project which attempts to create something similar to the well-known “Google Glass” with extended functionality.
The project consists of a wearable glasses display.
The device is capable of interfacing to an existing smartphone, allowing it to receive push notifications from the smartphone for things such as messages, s, and incoming phone calls.
The glass allows a gesture enabled input unlike Google’s device that only allows touch based inputs.

4. PSSCS
An ability for the phone to communicate with the microcontroller by sending and receiving data.
An ability of the microcontroller to buffer and display images on the screen.
An ability for the microcontroller to monitor battery usage and display as notification.
An ability for the microcontroller to see gesture/touch interface inputs in order to receive or delete image notifications off the screen.
An ability for the android app to sweep notifications and gather application data for the glass screen.

5. BLOCK DIAGRAM

6. MAJOR COMPONENTS ATMEL ATSAMD20E18A-AU Specifications- Flash - 256KB
SRAM - 32KB
I/O- 3.3V, Operating Supply Voltage- 1.8V
Interface- I2C, SPI, USART
IVDD- 92mA
IGND- 130mA
Provides with enough SRAM for buffering an image along with the sufficient memory for computational requirements
Provides with all the interfaces required for our design

7. Bluetooth LE Microchip RN4020
MAJOR COMPONENTS
Bluetooth LE Microchip RN4020
Specifications
Operating Voltage - 1.8V to 3.6V
USART Interface
Capable of Duplex Communication
Operation Range-100m
ASCII command interface API over USART
64 KB Internal Flash
Current Rating
Idle- <1.5mA
TX/RX active- 16mA

8. MAJOR COMPONENTS OLED Display 0.95” Interface : SPI Driver : SSD1331
VCC: V power supply
Self-emitting light, in contrast to the required backlight for TFT-LCD
Resolution - 96 * 64
Color: 65k

9. SDA - (serial data I/O for I2C-bus)
MAJOR COMPONENTS
Gesture Sensor - APDS
Specifications
Operational Voltage: 3.3V
Operating Range: 4-8in
I2C Interface
Max Current : 250 µA
SCL, SDA input low voltage,
VIL VIL 0.54 V
SCL, SDA input high voltage,
VIH VIH 1.26 VDD V
SCL - (clock signal for I2C serial data)
SDA - (serial data I/O for I2C-bus)

10. BLOCK DIAGRAM

11. PACKAGING DESIGN
Top View
Front View
Side View

12. ELECTRICAL SCHEMATIC
Include one or more views of your electrical schematic here. If necessary, break up this section into multiple slides detailing various subsystems which are easily viewable (Hint: a zoomed out view of a large electrical schematic in which nothing can be read will not be helpful for the design review). Your schematics should be complete, organized, and readable.

13. PCB LAYOUT

14. PCB LAYOUT WITHOUT GND PLANE

15. BLE RN 4020 SCHEMATIC

16. CRYSTAL & OLED SCHEMATIC

17. PROTOTYPING PROGRESS

18. ANDROID PROGRESS
Prototyped basic app to read existing notifications and create new ones.
Started prototyping a basic app that utilizes the android bluetooth library.
Temporarily stalled progress until RN-4020 work on microcontroller is completed.

19. BLUETOOTH INTERFACING PROGRESS
Got the USART module configured on the dev board to communicate with the Debug Pins and echo characters on Tera Term.
Got the RN4020 working with the TTL - 232R cable which provides a convenient way of sending/receiving via USB.
Using the LD33V voltage regulator to convert the 5V power supply on the cable to 3.3V.
Sent data over the provided apk to check bluetooth functionality on receipt of data packets.

20. BLUETOOTH INTERFACING PROGRESS
BLE RN4020 Interfacing - In development
Able to send data bits from microcontroller GPIO to RX pin on the RN 4020.
This power state is entered upon any required RF activity (TX/RX) during advertising, discovery, pairing, connection, etc.
WAKE_HW and WAKE_SW are used in conjunction to put the BLE in “dormant” power state.

21. PROJECT TIMELINE

22. 3D PRINTING
Questions?