Attended: Mengyuan, Creighton, Scott

• Updates:
  • Completed real time processing algorithm
  • Documented development of algorithm
• To Do:
  • Test accuracy of algorithm with a single microphone

• Updates:
  • Documented the test procedure, readjusted the voltage thresholds to 70% of the maximum value
  • Implemented wave counting using voltage thresholding and hardware interrupts, for one and then two microphones.
  • Ran experiments involving counting wave periods and the wave-counting algorithm
    • Was able to play a 1kHz signal and have both microphones measure the time it took to count 1000 wave periods
    • Derived the original frequency based off of the number of periods (1000) and the elapsed time (f = periods/time)
    • Results were fairly accurate (mic 1 was generally within 1 Hz and mic2 was within 5 Hz)
    • Because mic2 is farther away, we think that some waves might have been “lost”, or didn't have enough energy to successfully trigger mic2 in order to be registered.
• To Do:
  • Think of ways to improve the accuracy of mic2 (maybe use a louder source?)
  • Implement the algorithm to derive the propagation time between mic1 and mic2 (and thus the wind speed).
  • Create a Schmitt trigger using an op-amp and replace the comparator circuit

Contributing authors:

Created by mwu on 2017/02/18 00:47.