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wind_sensor:meeting_minutes_mar_17_2017 [2017/03/18 01:13] mwu [Ultrasonic Wind Sensor] |
wind_sensor:meeting_minutes_mar_17_2017 [2021/09/19 21:59] (current) |
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| =====Acoustic Wind Sensor===== | =====Acoustic Wind Sensor===== | ||
| * Updates: | * Updates: | ||
| - | * | + | * Soldered new microphones to tests |
| + | * Began testing algorithm using the new microphones | ||
| + | * recalculated coefficients for mapping wind speed to real time process output | ||
| + | * calculated using single trials of 5 different wind speeds | ||
| + | * New microphones were tested on a breadboard | ||
| + | * Results are consistent - algorithm accurately determines wind speeds, but has fairly poor precision | ||
| * To Do: | * To Do: | ||
| - | * | + | * De-solder microphones from pcb and see if that fixes the original problem |
| =====Ultrasonic Wind Sensor===== | =====Ultrasonic Wind Sensor===== | ||
| * Updates: | * Updates: | ||
| Line 11: | Line 16: | ||
| * Using 1k samples, the results were pretty consistent (varies by around 1 microsecond). However, I noticed that the experiment was **very** sensitive to its surroundings. Even moving my hand around (about 2 feet away) was still enough to cause fluctuations in the results. | * Using 1k samples, the results were pretty consistent (varies by around 1 microsecond). However, I noticed that the experiment was **very** sensitive to its surroundings. Even moving my hand around (about 2 feet away) was still enough to cause fluctuations in the results. | ||
| * The good news is that if I keep my hands still, the results are pretty consistent. | * The good news is that if I keep my hands still, the results are pretty consistent. | ||
| + | * Constructed a 40kHz square wave using a 555 timer and plan to use that to drive the transducer emitter. | ||
| * To Do: | * To Do: | ||
| * Gather some data using our current experimental setup. | * Gather some data using our current experimental setup. | ||
| + | * Start implementing amplifier with the transducers so the Teensy can control the emitter. | ||
| * Look into using high speed ADC found here: https://forum.pjrc.com/threads/25532-ADC-library-update-now-with-support-for-Teensy-3-1. Only use a limited bit precision to try and get the highest speed. | * Look into using high speed ADC found here: https://forum.pjrc.com/threads/25532-ADC-library-update-now-with-support-for-Teensy-3-1. Only use a limited bit precision to try and get the highest speed. | ||
| * Look into using thresholding to detect a wave, and then run some ADCs to determine the phase shift afterwards. | * Look into using thresholding to detect a wave, and then run some ADCs to determine the phase shift afterwards. | ||