ECE Department SDP07 Team Members:Chad Baldi Julian Salai Allan Maina Linwood Williams Team Advisor: Professor Omid Oliaei FanSafe

2 ECE Department SDP07 Origin of Idea  SawStop ® technology Capacitive based touch sensor  SawSafe Chainsaw based proximity sensor  FanSafe Industrial fans

3 ECE Department SDP07 Concept  Human proximity detector Electric field sensing  Stop the motor Safety precaution

4 ECE Department SDP07 Kirchhoff’s Voltage Law

5 ECE Department SDP07 Marketability  Protective grill not needed Easily cleanable Low accumulation of allergens and dust Visual aesthetics  Industrial applications Maximize air flow Safety

6 ECE Department SDP07 General Layout Electrode Sensors Sensor Circuit Multi-Channel Slip Ring Motor Stop Control Board

7 ECE Department SDP07 MDR Specifications  Acquire fan  Plans for sensor placement  Analog sensing  Interference  Options in signal processing  Data transfer solution

8 ECE Department SDP07 MDR Specifications  Fan selection Fan blade material Size Cost

9 ECE Department SDP07 MDR Specifications  Sensor placement Electrode / Shield material Insulator material Location on fan blade Mount configuration Coaxial connector type

10 ECE Department SDP07 Fan Blade Sensors / Coax Components

11 ECE Department SDP07 MDR Specifications  Analog Sensing IC settings & properties Use of Shield Sensor specifications

12 ECE Department SDP07 Sensor Circuit Fan Blade Sensors

13 ECE Department SDP07 Sensor Video

14 ECE Department SDP07 MDR Specifications  Interference & Noise Noise created in optimization of distance. (P-P 20mV) No noise from AC Motor

15 ECE Department SDP07 MDR Specifications  Signal processing concepts Serial ADC PIC processor Noise averaging Slope algorithm

16 ECE Department SDP07 MDR Specifications  Data Transfer Multiple port slip ring Power input to circuit Sensor digital output

17 ECE Department SDP07 Next Step  Acquire slip ring Number of connections Hallow ring Possibly self made (cost/noise) Needed for on-fan testing (priority) SLIP RING FAN PCB MOTOR PCB V DD AGND DGND DATA

18 ECE Department SDP07 Next Step  Develop PCBs Need for on-fan testing Decide on A/D sampling rate Resolve shielding issues

19 ECE Department SDP07 Next Step  PIC processing code With on-fan testing create processing algorithm Algorithm developed to detect proximity & kill noise

20 ECE Department SDP07 Next Step  Motor stop relay Develop process to stop motor Timing may be critical Possible mechanical brake technique

21 ECE Department SDP07 FanSafe Thank You.