wind_sensor:meeting_minutes_feb_17_2017

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

Authors

Contributing authors:

mwu snishihara

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

  • wind_sensor/meeting_minutes_feb_17_2017.txt
  • Last modified: 2017/02/25 00:38
  • by snishihara