17 votes

Ways to make a "How hard is it raining?" detector for personal use?

If you're open to a more mechanical solution, I'd suggest building a "tipping bucket rain gauge", best explained by a picture (source: https://www.researchgate.net/figure/Sideview-of-tipping-...
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14 votes

Ways to make a "How hard is it raining?" detector for personal use?

Upon reading the question my first thought was, please define what is meant by "how hard is it raining?". My initial tangent thought was "what about the impact energy of the rain" -...
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13 votes

Ways to make a "How hard is it raining?" detector for personal use?

It's not perfect, but a simple solution to the issue of a puddle building up on the resistance plate is to tilt the plate a bit, so that instead of the water building up on the plate it runs off. Your ...
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13 votes

Ways to make a "How hard is it raining?" detector for personal use?

One way to do that is to estimate how much water is changing. If you can ignore the spill over, then that is approximately how much the puddle is changing. Another idea you can use is to measure the ...
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10 votes

How do the pros measure humidity?

The WMO report Instruments and Methods of Observation has a chapter on Measurement of humidity and a separate chapter on Measurement of upper-air pressure, temperature, humidity. The first deals with ...
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  • 772
9 votes

Are there any DIY conductivity sensors that will hold calibration for long periods? {multiple months}

I've built DIY conductivity probes for subglacial measurements. Unfortunately my sensors remain under ~100m of ice so I haven't be able to recover them to check the calibration, but for the same ...
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6 votes

Ways to make a "How hard is it raining?" detector for personal use?

I would approach this by counting pings on a plate with an attached piezo or microphone. The amplitude of the ping will give the volume of the drop and the number of pings the drop quantity. This is a ...
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6 votes

Ways to make a "How hard is it raining?" detector for personal use?

A 'video disdrometer' is a device for characterizing raindrop size distributions. Professional versions (e.g A 1D distrometer) can use a video camera to image the shadow cast by water droplets moving ...
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6 votes

How do the pros measure humidity?

We use something like an Onset HOBO electronic sensor. They've got logging (and in some cases, networking) built in. They'll typically log both temperature and relative humidity at regular intervals ...
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  • 4,090
6 votes

How is relative humidity determined from a wet and dry bulb readings?

Edit: 1 May 2021 The following procedure uses the less accurate method from page 455 onward from the scanned sections of the book pictured below, from the original answer. The procedure is a ...
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4 votes
Accepted

Which type of seismic sensors usually used in Earthquake Early Warning?

Accelerometers, preferably triaxial (i.e., those that record horizontal and vertical motion). Beyond that your question is indeed a bit too open-ended. Some use many cheap MEMS (http://onlinelibrary....
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  • 1,969
4 votes

Ways to make a "How hard is it raining?" detector for personal use?

I sort of accidentally did this in one of my projects in a complicated, backhanded sort of way. I installed 16 soil moisture sensors in my yard as part of an attempt to track the distribution of water ...
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  • 141
3 votes

Ways to make a "How hard is it raining?" detector for personal use?

You could connect a funnel to a water wheel. The faster it spins the higher intensity of the rain. This sensor was selected randomly, as should not be consider something I specifically endorse. https:/...
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2 votes

How do the pros measure humidity?

The Bureau of Meteorology in Australia traditionally uses wet and dry bulb thermometers read by humans, when measuring temperature. However, for remote automated weather stations, electrical equipment ...
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2 votes

How is the specific heat of a wet bulb determined?

I misunderstood how wet bulb thermometers worked and was confused too... and I'm hopeful that explaining my separate confusion will actually help put emphasis on what's really happening for your ...
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1 vote
Accepted

What to do with a gas sensor's values that fall outside of a model's range?

I'll update my code to ignore the sensor readings that fall outside the calibrated range. Do not do that. Instead flag them as off-scale low or off-scale high. Those off-scale low / off-scale high ...
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