1. Mike Pappas, Nigel Himmelreich, Eric Anderson
NFC Sensor System
Mike Pappas, Nigel Himmelreich, Eric Anderson

2. Overview Sensor module Reader module Smartphone
Sensors connected to a microcontroller and transmits data over NFC (Near Field Communication)
Reader module
Receives data over NFC, logs the data, and retransmits over Bluetooth
Smartphone
Receives values, stores the data, and displays graphically
Eric

3. Motivation Inspired by a “disposable smart bandage” concept
Proof of concept that real-time sensor data can be transmitted over NFC
Ultra-low power operation
Reusable logging portion attaches overtop the sensors
Inductively powered
Mike

4. Medical Relevance
Device could monitor wound moisture/humidity, ammonia, oxygen and temperature levels
Status of a wound without removing a dressing
Improved costs
Hospital bed ~$2500/day VS. ~$1000/day for home visit
Keep patient out of hospital and improve care
Mike

5. The System
Nigel

6. Sensor Module Texas Instruments RF430 NFC Module
Texas Instruments MSP430 Microcontroller
Analog temperature sensor accurate to ±1℃
Photoresistor for measuring light intensity

7. Sensor Module
Obtains analog sensor data, converts to digital, then transmits over NFC
Uses between mW of power
Estimated 5 days battery life on a single watch battery (CR2032)
Induction power

8. Reader Module Altera DE0 Nano FPGA Adafruit PN532 NFC Shield
Running MicroC/OS, it logs data and transfers values between NFC and Bluetooth
Adafruit PN532 NFC Shield
Connected with I2C, it triggers an interrupt in the DE0 when an ISO 14443B device is in range

9. Reader Module Olimex MOD-BT Bluetooth Module
Connected via a serial UART connection
Setup as a server, sending sensor values to any connected device
The data from the NFC reader is sent over the Bluetooth connection

10. Reader Module Is powered by any 3.3V source
Can be placed over a sensor for a long period of time to log data
Provides the inductive power

11. Application Android application Fetches data via:
NFC connection by tapping phone onto NFC portion of sensor module
Bluetooth connection waits for an incoming Bluetooth string with data
Data is parsed and displayed to user
Data is saved to memory to retain history
Eric

12. Application History view on application to view past readings
Graph view displays a graph of the data
Temperature reading and light readings are easily switched by pressing a button
Each graph can be divided by various amounts of days
Eric

13. Demo

14. Challenges New development board (MSP430)
Android development with NFC and Bluetooth connections
Porting library for NFC reader and extend to read type B devices
NFC hardware limitations
Nigel

15. Results
Successfully implemented the MSP430 architecture for NFC communications
Able to transmit sensor data over an NFC (NDEF) message
Transmit NFC data directly to an Android device
Mike

16. Results
Able to receive NFC information and send Bluetooth data on the DE0
Able to receive Bluetooth data on the Android smartphone
Induction power to sensor module
Nigel

17. Future Extensions
Logging to a computer or a server for remote monitoring of data
Attach a screen to the reader module for real time data without a smartphone
Eric

18. Future Medical Extensions
RFID Integrated Chip
Disposable implementation
Lower cost - dimes to pennies per chip
More relevant sensors
Mike

19. Questions? ?