V i t a l i s ECE Spring 2013 TEAM 13 Wireless Biometric Sensor Team Members: Aakash Lamba Di Mo Shantanu Joshi Yi Shen Design Review

ECE 477 Design Review Team 13 – Fall 2013 Paste a photo of team members here, annotated with names of team members. Shantanu Joshi /Aakash Lamba / Di Mo / Yi Shen

Outline Project overview Project specific success criteria Block diagram Component Selection Rationale Packaging Design Schematic and theory of operation PCB layout Software design/development status Project completion timeline Questions

Prototype of a portable wireless biometric sensor Battery-powered device with fuel gauge Mounted on the wrist Monitor pulse rate, SpO 2 and skin temperature Transmit the information via Wi-Fi for remote web access NFC chip allows immediate access to patient data Accelerometer on the shoulder for fall detection Manual and automatic alarm system. Project Overview

Project-Specific Success Criteria An ability to determine pulse and SpO 2 readings from blood light absorption An ability to display the users vital statistics (pulse, SpO 2, skin temperature) on the LCD screen mounted on the device which is located on the patients wrist An ability to remotely monitor the users medical status from a web- site via secure login or authentication through an on-device NFC tag An ability to activate an alarm both manually (through an emergency button) and automatically in response to anomalous readings of vitals An ability to detect if the user has suffered a fall and automatically raise an alarm

Block Diagram

Component Selection Rationale Microprocessor (1) Critical Design Constraints At least 2 UART outputs for WiFi and LCD One or more I2C and SPI (for debugging) connections Operable using internal oscillator (8 MHz or more) Low power consumption (< 20 mA active) Has a well established design tool chain Preferable Design Characteristics Low pin count Large amounts of internal flash/SRAM

Component Selection Rationale Microprocessor (2) ATmega1284PIC32MX250F128D Supply Voltage V V Active current draw (8 MHz)12 5 V V I2C channels12 SPI12 UART22 Internal Oscillator8 MHz Pin count44 Memory16k RAM/ 128k flash32k RAM/ 128k flash IDEAtmel StudioMPLAB Additional InfoAvailable in 40 pin PDIPbuilt-in USB Cost$7.22$4.81

Component Selection Rationale Sensors/Modules (1) General Requirements Small size Low cost Easy to use 3.3 or 5.0 V Well documented Communication via UART or I2C Components Accelerometer Temperature OLED screen Wi-Fi module Light to frequency converter

Component Selection Rationale Sensors/Modules (2) Accelerometer Analog output 3.3 V Easily clipped on shoulder 3 axis sensing Low power (350 μA) OLED Screen UART communication 5.0V Extremely easy to program Appropriate size for embedded application WiFly Module Low power - 4 μA sleep and 38 mA active UART communication Built in HTML commands to make POST request Light to Frequency converter Programmable sensitivity Extremely small size Operates in wide range of temperature(-25°C to 75°C)

Packaging Design (1) Packaging Constraints Portable - The device must be portable such that a patient may move around while carrying it. It should operate wirelessly so as to enable patient mobility. Light weight – The device must be light weight. Since the average weight of a smart phone is 120 g, we are targeting something on the order of g. Small – The device needs to be small since it needs to be mounted on to the users wrist. We are aiming to make the breadth less than 5 cm. The average wrist is approximately 4.7cm in diameter.

Packaging Design (2) Philips IntelliVue MX40 Hung around the neck in a transparent carrying pouch Touch screen UI Sensor wires extend across patient’s chest Entire package (including pouch) is relatively large and cumbersome. ViSi Mobile health monitor Worn around the wrist; supported by a band Touch screen UI Small and discrete. Only respiration rate sensor is placed on user’s chest Aesthetically pleasing

Packaging Design (3)

Packaging Design (4)

Packaging Design (5)

Packaging Design (6) Summary: Size and Weight (main device): Height: 96 mm Width: 50 mm Depth: 10.1 mm Weight (estimated): ~150 grams Components external to device: Pulse oximeter: Clipped on finger Accelerometer: Clipped on to clothing near shoulder Temperature sensor: Underneath the main device mounted on the band Power module:Attached to the bottom on the neoprene band Packaging requirements: Band material: Neoprene band with Velcro for securing onto wrist Device packaging: Plastic casing

Schematic: Complete Design

Schematic: Section Breakdown Microcontroller Power and Battery Management Sensors External Interfaces

Power Supply Description Supply Voltage – Lithium Polymer Outputs 3.7 Volts (Nominal) – 3.3 Volts Microcontroller Sensors (SpO2, temperature, accelerometer) Wi-Fi Module – 5 Volts OLED

Schematic: Power Supply Charger/Booster Fuel Gauge Headers 5V Step Up

Sensor Description Push Button – (Emergency) Digital Inputs Accelerometer (Analog) 3 Analog Inputs (3-axis) Temperature (digital) I 2 C interface Pulse Oximeter External Interrupt (Frequency output from photo-sensor) 2 Digital Outputs o Regular Red LED o Infrared LED

Schematic: Sensors Pulse Oximeter Temperature Accelerometer Emergency Push Button

Wi-Fi and OLED Description Communicates with microprocessor via UART Wi-Fi also requires hardware flow control through CTS/RTS OLED operates at 5V compared to 3.3V for everything else Wi-Fi and OLED both contain a on- board processor – Wi-Fi module implements handshaking, parsing, and TCP stack creation – OLED handles high-level graphics and programmable updates

Schematic : Wi-Fi & OLED Wi-Fi Module UART TXD0: PD1 RXD0: PD0 CTS: PC6 RTS: PC7 OLED UART TXD1: PD3 RXD1: PD2 Wi-Fi OLED

Microcontroller Description Does all on-device data acquisition and processing – Peak detection for pulse – Look-up table for SPO2 – Acceleration processing for fall detection – Temperature conversion Communicates to website through Wi- Fi via UART interface Debugging and Programming using standard 10-pin JTAG interface

JTAG Headers To Power Board SPI ATmega1284 Schematic: Microcontroller I2C Bus Decoupling Capacitors

PCB Layout: Overall PCB (3.8 x 3.25) Power Board Main Board

PCB Layout: Top Copper

PCB Layout: Bottom Copper

PCB Layout: Silk Layer

Trace Size for 3.3 V, 5 V and GND is PCB Layout: Power PCB (2.9 x 1.15) (GND Highlighted)

PCB Layout: Power PCB (2.9 x 1.15) Power Connect 5 V Step Up Fuel Gauge Charger/Booster Decoupling Capacitors (C1,C2) for Power Traces

PCB Layout: Main PCB (3.25 x 2.8) (GND Highlighted) Trace Size: 3.3 V, 5 V and GND Others – Hole Size (Diameter): Power Others –

PCB Layout: Main PCB (3.25 x 2.8) Decoupling Capacitors for Micro: C3,C7,C9 (Size:0805) Decoupling Capacitors for VCC(3.3V)/GND: C10 Decoupling Capacitors for Accelerometer : C4 Decoupling Capacitors for OLED : C5,C8 Decoupling Capacitors for Wi-Fi : C6 (Size:1210) *All passive components are surface- mounted

PCB Layout: Main PCB (3.25 x 2.8) (Debugging Connectors Highlighted) Power SPI RESET JTAG

PCB Layout: Main PCB (3.25 x 2.8) (Sensor Connectors and Others Highlighted) Accelerometer BUTTON Temperature Sensor POWER Wi-Fi SPO2 LED OLED

Software Design Web Application – Node.js, Express,Jade,Stylus,MongoDB – Login, patient details and DB communication  Done – Improve UI, plotting library and Wi-Fi communication  To Do Embedded Software – UART up and running – Pulse oximeter processing finished. – ADC,I2C, OLED display, Wi-Fi configuration to be accomplished. Android application – Programming in eclipse SDK – Login screen, detecting and reading NFC tags  Done – Once web site is hosted, will enable auto-login from the app using NFC authentication

Project Completion Timeline Week of 2/25: – Focus on embedded software – Get the Accelerometer interfaced with the micro. – Iron out flaws in PCB Week of 3/4: – Proof of parts – Continue with software development Week of 3/11: – Host the website – Spring Break!!! Week of 3/18: – Begin populating the PCB – Finish building OLED display – Finish interfacing all sensors Week of 3/25: – Continue populating PCB – Get the Wi-Fi updating useful information to the web-server – Enhance the UI for the web-app Week of 4/1: – Start testing – Arrive at stable version of SW Week of 4/8: – Debugging – Ethical and Environmental impact Week of 4/15: – Final tweaks – Prepare demo