Wind Speed

Ultrasonic wind measurement.

Reference: Ultrasonic Anemometer, Anemometer, Carl47

This would also tell you the wind direction.

When using a set distance ultrasonic distance sensors sense the air motion. Not a doppler effect, but the same idea. First to find out how accurate would it be using a HC-SR04s. I have 200kHz ultrasonic transducers, I’d need to find out how to drive them and what I’d need to receive.

For multiple ultrasonic sensor considerations
http://maxbotix.com/articles/031.htm

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