1. Smart Bandage Wound Monitoring Through a Connected Smart Bandage
Mike Blouin – Hardware & Embedded
Jenna Hatchard – Embedded & Android
Jared Cuglietta – Android & Web
ECE 492 Group 1– Winter 2016

2. Motivation In-home care of patients costs $1000/day
Bandage swapping may interfere with wound healing
Not replacing a bandage when it needs replacing can lead to infection/interference with healing
Optimally timing bandage replacement reduces costs, speeds healing
Woman had wounds for 10 years, for 2 years received home care, total cost estimate around $1000/day. Over two years cost ~$730,000. With aid of the smart bandage, if only have to do homecare every other day for the 2 years, then the cost would be ~$ which saves a total of ~$ (calculations in appendix)

3. Solution Design Goal: Small size representative of real-world solution
Bluetooth-capable TI CC2640 Microcontroller
Integrated battery management for 110mAh battery
Temperature, humidity, and moisture sensing
Software recognition of “interesting” data points
Android application for reading information from device and relaying
Web application for remote monitoring of patient information

4. System Architecture
Direction of Data Flow

5. Components Communications Module Bandage Module
Reusable enclosed module
Bandage Module
FPC Sewn into bandage

6. Communications Module Hardware
Battery image source:
Battery Dimensions: 5.7x12x28mm
Stats:
32 Packages
83 SMDs
8 fine pitch

7. Code Sample – Enumerating BLE Devices
protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mHandler = new Handler(); mLeDeviceListAdapter = new LeDeviceListAdapter(); lv = (ListView) findViewById(R.id.listView); lv.setAdapter(mLeDeviceListAdapter); scanBtn = (Button) findViewById(R.id.scanBtn); //api23+ requires permission access to coarse location even for bluetooth //so we have to ask for permissions //first check if the app already has permissions to access if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { //prompt explanation if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_COARSE_LOCATION)) { } else { ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, PERMISSION_REQUEST_COARSE_LOCATION); } } // Initializes Bluetooth adapter. final BluetoothManager bluetoothManager = (BluetoothManager) getSystemService(Context.BLUETOOTH_SERVICE); mBluetoothAdapter = bluetoothManager.getAdapter(); // Ensures Bluetooth is available on the device and it is enabled. If not, // displays a dialog requesting user permission to enable Bluetooth. if (mBluetoothAdapter == null || !mBluetoothAdapter.isEnabled()) { Intent enableBtIntent = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE); startActivityForResult(enableBtIntent, REQUEST_ENABLE_BT); } scanBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.i("Button","Clicked"); scanLeDevice(true); } }); }

8. Testing Hardware Software
Separate PCBs allow for individual testing of power stages and MCU
TI Launchpad to be used for development of BLE code
Software
Core State Machine can be easily unit tested
Android application will be largely unit tested
End-to-End test including the MCU and java/web apps will be used to test intercommunication.
Testing is all about isolation of problems. Goal with hardware is to have easily accessible paths for isolating various components/functions.

9. Application Notes PCB Review Guidelines 3.3V Buck/Boost Converter
Talk to us if you are interested ASAP

10. Questions?
Wound Monitoring Through a Connected Smart Bandage

11. Full Schematic

12. CC2650 Launchpad Code compatible with CC2640 Contains XDS110 Debugger
Can program standalone devices

13. State Diagram for MCU States: Events:
Sleep, Check, Transmit, Initialize, Temporary Error, Permanent Error
Events:
Check Timer Expires, BLE Timer Expires, Data Change, No Bandage Detected

14. Power Calculations State Seconds/Hour (S) Current Draw (uA) CHECK_MODE12
130,367
TRANSMIT_MODE 10
8,400
SLEEP_MODE
3588
2.7
All Modes (Passive Consumption)
3600
133
Power Consumption: mAh
Battery Life: 157 hours (6.6 days)
This could be optimized by introducing ultra-low power timers such as TI TPL5110 for 33.6% more battery life
Would reduce the all mode passive consumption + SLEEP_MODE to ~40nA.

15. Moisture Sensing Goal: Detect surface moisture through resistivity
Grid of conductive material spaced at 1cm intervals inside bandage
Max current of 0.3mA < minimum threshold of sensation

16. Price Estimates
Approximate cost for 2 year homecare without the Smart bandage = $𝟕𝟑𝟎,𝟎𝟎𝟎
Approximate cost for 2 year period with smart bandage = $𝟑𝟔𝟕,𝟐𝟖𝟐.𝟔𝟐
Overall Savings − =$𝟑𝟔𝟐,𝟕𝟏𝟕.𝟑𝟖
Price Calculations For Smart Bandage Costs