Hello! Im currently trying to make an ultrassound anemometer using 2 HC-SR04 sensors, and with a bme280 to get its values (to adjust the wind messurement to the ambient conditions, like high humidity). I can already read all the values from the sensors, but i feel kinda lost now. My idea would be t…

If the distance between the posts is about 30cm, then the time it takes for an ultrasonic post to travel from one post to the other is about 0.3m/343m/s=874us If there is a 10m/sec wind carrying the pulse, then it would take 0.3m/(343m/s+10m/s)=0.849us, or 25us less time. If the times are about t…

Not at all sure what you are trying to do in the context of a weather station.

Im simply trying to measure the speed of the wind with the ultrasonic sensors, but to do it im also gonna need to use the values of the bme280 to make the adjustments based on its values (because the ultrassonic sounds can be delayed in certains weather conditions)

[image] chatbot_enjoyer: I can already read all the values from the sensors, but i feel kinda lost now. So are we! What are you expecting to do with those values?

Im trying to use the wind speed formula (someething like this: float windSpeed = (distance / 2) * ((1 / time1) - (1 / time2)); ) to achieve the windspeed. And then the bm280 values to make some small corrections

Ok, I see right way the second sensor is still receiving the signal from the first sensor when you trigger the second one. Would your scheme not work better to just have a solid reflector in front of one sensor and rellate the echo time to wind speed? What is the purpose of two sensors?

The 2 sensors are going to send the ultrasounds to one another (with one of them against the wind and the other in favor). With this, one of the sensors is going to receive the sound quicker than the other, and subtracting this values and with some other calculations, in theory i could measure the w…

Don't you think it would be appropriate to trigger them at the identical times, rather than sequentially?

Hi, Look at this destructible, it may help as to the technique of using ultrasonics. [image] Sonic Anemometer Sonic Anemometer: Most of the sensors in a weather station now use miniature electronic components to measure the environment. Light, pressure, temperature and humidity can all …

That has been done a few times (see above). There are several different approaches. A couple of others are described here: [image] Open Source Ultrasonic Anemometer Weather stations are a popular project for experimenting with various environmental sensors, and for wind speed and direct…

yeah, i have seen those before. but the thing is i need to do it with just 2, even tho it might be not that perfect. Just wanted to know if it could be possible to pull off

Making an Ultrasonic Anemometer Using Just 2 Ultrassonic Sensors (HC-SR04)

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Paul_KD7HB January 10, 2025, 10:12pm 4

So are we! What are you expecting to do with those values?

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Making an Ultrasonic Anemometer Using Just 2 Ultrassonic Sensors (HC-SR04)

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