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NFC Sensor System

NFC Sensor System. Texas Instruments MSP-430FR5969. ECE 492 - Winter 2015. Group Members. Mike Pappas Sensor connections to MCU and NFC Nigel Himmelreich NFC connection to DE0 and Bluetooth Eric Anderson Bluetooth-Android communication, data logging and sensor display application.

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NFC Sensor System

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  1. NFC Sensor System Texas Instruments MSP-430FR5969 ECE 492 - Winter 2015

  2. Group Members • Mike Pappas • Sensor connections to MCU and NFC • Nigel Himmelreich • NFC connection to DE0 and Bluetooth • Eric Anderson • Bluetooth-Android communication, data logging and sensor display application

  3. Functionality • Inspired by a disposable ‘Smart Bandage’ • Transmits real time sensor data over NFC • Inductively powered via NFC • Transfers NFC data to Bluetooth for constant monitoring via DE0 • Data logging/display on Android

  4. Design - Hardware

  5. Design - Sensor Connections As of Feb 8, 2015

  6. Design - Software • MCU • Gather sensor data • Package into NDEF (NFC data format) and send • DE0 • Read from NFC and log • Send data over Bluetooth • Smartphone • Read current sensor data • Display current and past data graphically

  7. Design - Sensor Software Flow Diagram • Induction power does not allow for idling • Power on -> Initialize -> Perform Read -> Power Off (lose power)

  8. Design - Challenges • Induction power - difficult to operate on 100μA. • Challenging antenna implementation (≃1mm x 1.8mm Schottky diodes with < 0.4V forward voltage) • NFC to DE0 communication - minimal resources available

  9. Design - Calculations Antenna Design where • a = (ri + ro)/2 • b = ro – ri • ri = Inner radius of the spiral • ro = Outer radius of the spiral • N = number of turns

  10. Design - Components • Thermal sensor and light diode • TI MSP430FR5969 MCU • TI RF430CL330H NFC Module • PN532 NFC Shield • DE0 Nano • MOD-BT Bluetooth Module • Android Device

  11. /* From RF430.h */ //MSP-EXP430FR5969 port definitions //I2C #definePORT_I2C_OUT P1OUT #definePORT_I2C_DIR P1DIR #definePORT_I2C_SEL0 P1SEL0 #define PORT_I2C_SEL1 P1SEL1 #define SDA BIT6 #define SCL BIT7 //INTO #define PORT_INTO_IN P2IN #define PORT_INTO_OUT P2OUT #define PORT_INTO_DIR P2DIR #define PORT_INTO_SEL0 P2SEL0 #define PORT_INTO_SEL1 P2SEL1 #define PORT_INTO_REN P2REN #define PORT_INTO_IE P2IE #define PORT_INTO_IES P2IES #define PORT_INTO_IFG P2IFG #define INTO BIT2 Code Example - RF430 Init. /* From main.c */ // Disable the GPIO power-on default high-impedance mode // to activate previously configured port settings PM5CTL0 &= ~LOCKLPM5; // Configure pins for I2C PORT_I2C_SEL0 &= ~(SCL + SDA); PORT_I2C_SEL1 |= SCL + SDA; //Configure eUSCI for I2C Mode //Set I2C mode, Master mode, sync, transmitter UCB0CTLW0 |= UCMODE_3 + UCMST + UCSYNC + UCTR; UCB0CTLW0 |= UCSSEL_2; // SMCLK = 8MHz //configure pin for INTO interrupts PORT_INTO_SEL0 &= ~INTO; // GPIO PORT_INTO_SEL1 &= ~INTO; // GPIO PORT_INTO_DIR &= ~INTO; // Input PORT_INTO_OUT |= INTO; // Output high for pullup PORT_INTO_REN |= INTO; // Internal pullup resistor PORT_INTO_IFG &= ~INTO; // Clear interrupt flag PORT_INTO_IES |= INTO; // Fire interrupt on high-to-low transition // since INTO is setup active low

  12. Test Plans • Unit Testing • Test sensor data being read to MCU • Test NFC data is being sent from MCU to DE0 • Test Bluetooth data from DE0 to smartphone • Verify logging ability of DE0 and smartphone • Test smartphone app and functionality • Integration Testing • Test overval data from sensors to smartphone • Verify correct data logged

  13. Optional features • Inductively power the NFC, MCU, & sensors via power from the NFC antenna when communicating with the receiving board • Add additional sensors • Join the NFC, MCU, & sensors all on one single circuit board with integrated antenna

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