1. FOUR CHANNEL ULTRASONIC RECEIVER TEAM C BRIAN MARKUS (TEAM LEAD) DANNY VISELMAN CHEN JIA

2. OVERVIEW Design and create a Four Channel Ultrasonic Receiver, capable of receiving signals between 30 kHz and 50 kHz. Capable of receiving a chirp signal as well as a constant frequency signal (Beacon). Will work with Team B’s Ultrasonic Transmitter.

3. SYSTEM DESIGN Level 0 Level 1

4. SYSTEM DESIGN (CONT.) Level 2

5. TESTING/EVALUATION Will use breadboards to build the system. Currently one channel is built and we have been testing it. Initially used a function generator as the input signal to the system. Eventually we collaborated with Team B and used their transmitter to receive their beacon signal as well as their chirp signal and recorded the results. Once the board is milled we will build all four channels on the PCB and verify that each function simultaneously.

6. TESTING/EVALUATION (CONT.) Figure 1 - Output of the mixer time domain and frequency domain, as well as the 33.5 kHz oscillator waveform

7. TESTING/EVALUATION (CONT.) Figure 2 - Time and frequency output of receiver system (blue and pink, respectively) and transmitted signal from transmitter (yellow)

8. TESTING/EVALUATION (CONT.) Figure 3 - Transmitted signal (yellow), received signal (pink) and beat frequency output (blue) at a distance of 53 cm

10. SCHEMATIC

11. SINGLE CHANNEL

12. BOARD LAYOUT

13. SOFTWARE PROCESS Local Oscillator SPI Protocol 16 bit binary number to calculate frequency written to Arduino in Hexadecimal Digital Amplifier 3 bit binary number to write gains of 0,1,2,4,8,16,32,64 Volts/Volt Synchronization with transmitter board. Rising edge of TTL signal will start transmission process and finish after a predetermined transmission time.

14. SIGNAL PROCESSING Four different signal into the ADC Use “fast” analog read (1us) Use FFT libraries to analyze the four frequencies Extract Amplitude and Phase information

15. Q5: The project organization (WBS, schedule, and org chart) is specific and sufficiently detailed. The project is well planed. Q7: Project risk has been identified and an good mitigation plan is in place.

17. PROJECT MILESTONES Signal Acquisition Mixer/LO/Filter/Amplifier Hardware design Over-voltage protection Embedded system design (software) (halfway done) Testing and evaluation

18. ORGANIZATION CHART

21. GANTT CHART

22. RISK MITIGATION High risks: 1.High volume of components 2.Voltage/Current limiting 3.Micro-solder required 4.Vulnerable components involved 5.Collaboration amongst team members and with the transmitter team is crucial. 6.Time limit

23. SOLUTIONS: Be careful, careful, careful, careful and careful Using breadboard for testing and data collecting process before soldering the actual PCB Schematic design One time micro-solder board, no more budget and time for any more duplicates Communicate with team B, regardless whether they want to talk to us or not try to not loss too many micro parts

24. QUESTIONS ?