SDP 11 CDR Team Goeckel Group: Adebayo Adeyemi, Joseph Hayward, Mark Kohls, Simon McAuliffe Advisor: Dennis Goeckel CDR Keeping The Secret

2 SDP 11 CDR Team Goeckel Brief Overview Step 1: Send test signal to desired radio. Step 2: RX radio sends back reply signal. Friends measure this signal strength. Step 3: TX radio sends out message. Friends not in range transmit noise.

3 SDP 11 CDR Team Goeckel System Requirements  Battery life of at least 12 hours  Receive and transmit  Operate while walking  Operate up to 300 meters. Receive signal with 95% success rate.  Voice Transmission Bandwidth  Maintain secure communications Less than 10% interception rate  Handheld and less than 2lbs.

4 SDP 11 CDR Team Goeckel Software Requirements RX Radio TX Radio

5 SDP 11 CDR Team Goeckel Radio Diagram Antenna Receiver Transmitter Microcontroller Microphone Speaker Transceiver

6 SDP 11 CDR Team Goeckel Schematic

7 SDP 11 CDR Team Goeckel PCB Board

8 SDP 11 CDR Team Goeckel GUI Demonstration

9 SDP 11 CDR Team Goeckel Testing Problems Board’s are unreliable for RF Varying RSSI Tentative Conclusion difference of.05 to.1 volt B1 RSSIB2 RSSI

10 SDP 11 CDR Team Goeckel Design Challenges  Noise Appropriate Signal Threshold Duration for transmission  Variable transmission strength  Procuring reliable data  Demonstrate functioning system Computer display of radio activity

11 SDP 11 CDR Team Goeckel Team Roles  Adebayo – Hardware production, radio testing  Mark – Programming radio unit, radio debugging  Joe – Report, Hardware production, radio testing  Simon – GUI for final demonstration, radio programming, radio testing

12 SDP 11 CDR Team Goeckel The Gantt Chart

13 SDP 11 CDR Team Goeckel What is next  Complete protocols for all radios  Field testing  GUI for Final Demonstration  Fabrication of Radios

14 SDP 11 CDR Team Goeckel Radio Demonstration  Send transmit signal  Receive transmit signal with receiver and eavesdropper  Friend transmits noise to block eavesdropper  Eavesdropper picks up noise signal  Receiver picks up desired transmit signal

15 SDP 11 CDR Team Goeckel Questions?