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Wind Sensor Team Meeting-February 17, 2017
Attended: Mengyuan, Creighton, Scott
Acoustic Wind Sensor
- Updates:
- To Do:
Ultrasonic Wind Sensor
- 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 comparater circuit