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wind_sensor:meeting_minutes_feb_17_2017 [2017/02/18 00:47] mwu created |
wind_sensor:meeting_minutes_feb_17_2017 [2021/09/19 21:59] (current) |
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| =====Acoustic Wind Sensor===== | =====Acoustic Wind Sensor===== | ||
| * Updates: | * Updates: | ||
| + | * Completed real time processing algorithm | ||
| + | * Documented development of algorithm | ||
| * To Do: | * To Do: | ||
| + | * Test accuracy of algorithm with a single microphone | ||
| =====Ultrasonic Wind Sensor===== | =====Ultrasonic Wind Sensor===== | ||
| * Updates: | * Updates: | ||
| - | * Modified the algorithm and successfully implemented wave-counting using hardware interrupts and voltage thresholding, for one microphone only. The experiment involved playing a sound wave with a known frequency and then having the Teensy measure how long it takes to "see" 1000 periods of that wave. From that measurement and the number of periods, we can derive the frequency and compare it to the frequency of our emitted wave. The experiment was successful as we were able to derive the emitted frequencies. | + | * 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: | * To Do: | ||
| - | * Implement wave-counting with two microphones | + | * 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 | ||