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Ultrasonic Receiver

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13 diapositives · 514 Views · Jul 13, 2014

Ultrasonic Receiver . Team F: Zach Garber, Scott Clausen, Jason Jonas, Jonathan Gabler. Project Overview . Building programmable ultrasonic receiver Variety of applications Distance measurement, wind speed, radar, etc. Customer is Dr. Allen Dual Channel capability added . Final Product.

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Ultrasonic Receiver
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  1. Ultrasonic Receiver Team F: Zach Garber, Scott Clausen, Jason Jonas, Jonathan Gabler

  2. Project Overview • Building programmable ultrasonic receiver • Variety of applications • Distance measurement, wind speed, radar, etc. • Customer is Dr. Allen • Dual Channel capability added

  3. Final Product • Separate PCB’s for the transducer and the rest of the receiving circuitry PCB 1 PCB 2

  4. Transducer PCB • 3 different PCB’s will be used for multiple purposes • 1). Omnidirectional transducer (for single channel operation) • 2). MEMS microphone with impedance matching (6.8 mH inductor) • 3). 6 pin socket capable of supporting two omnidirectional transducers (for dual channel operation) • These boards will be connected to the rest of the receiver via a 3 wire ribbon cable

  5. Receiver schematic

  6. subsystems • Amplifier • Completed with gain from unity to 4 V/V • Mixer • Completed with signals at 5 kHz and 75 kHz + spurious signals • Filter • In progress • LO • Code completed. Range of 1 kHz to 68 MHz

  7. Mechanical design and Construction • PCB Artist used to design custom PCB’s from outside company. • 3 for transducers, and 1 for receiver circuitry. • Ideally, two layer board • Weight (max): 80 g • Dimensions (max) : 2.25” x 4” x 0.625” (10 cm x 5.5 cm x 1.5 cm) • Enclosure not in our scope of responsibility

  8. Data and Analysis • Output of transducer: 40 kHz sine wave, amplitude depends on distance between transmitter and receiver • Input to amp: 40 kHz sine wave centered at 2.5 V • Output of amp: 40 kHz sine wave amplified up to 3 times input signal • Mixer inputs: Programmable square wave and amp output • Mixer output: Up and down converted spurious signals • Filter input: Mixer output and programmable square wave to set the cutoff frequency of the filter. • Filter output: Down converted signal that will offset by 2.5 V. This is the signal that will be stored in the Arduino for data extraction.

  9. Software processes • Digital potentiometer • In progress • LO • Completed • Data storage • In progress • Output to USB • In progress

  10. Schedule

  11. schedule • Milestone 1: Prototyping → Complete • Milestone 2: Coding → In progress • Milestone 3: Manufactured board and final testing → Not started • To complete: • Digital pot code • LPF • Test single channel • Custom PCB • Final testing

  12. Significant challenges • Issue with Arduino send/receive • Issue with mixer and filter compatibility • Adding dual channel capability • Interfacing prototype parts built separately • Relying on third party to manufacture board

  13. Questions?