Drone with sensor payload that transmits data to a mobile phone
The drone in the photo is an ST16B. It weighs only 142 grams, has no camera, costs less than 50 dollars and is designed for kids with no drone flying experience to learn the basics. It also provides an inexpensive way to explore atmospheric parameters in the near terrain region up to around 100 feet (30 meters). Here’s a quick guide to exploring near terrain atmospherics in your hood. (more…)
The recent incidents of severe flooding in the United States and Pakistan are traumatizing and ruinous to the many people affected and a shock to weather forecasters and local authorities. A wake-up call has been served and much meteorological research and analysis has been set in motion.
But we all know that making deductions about the influence of climate change is fraught with difficulty. We accept that no one can claim 100% certainty, and this gives space for sceptics to challenge assertions made, and to put forward alternative explanations.
This is the nature of debates with many voices, many strongly held beliefs and many interests to serve. No doubt it will continue this way. But at the same time it is useful to remind ourselves that atmospheric thermodynamics can furnish us with facts upon which we can all agree. (more…)
As a follow-up to my 2018 Smart Temperature and Humidity Gauge here is a new and improved wireless version. A smartphone screen replaces the previous LCD display, allowing the data to be read remotely from the device location.
The WiFi-enabled microcontroller can be programmed to operate in Station mode, Access Point mode or both modes simultaneously so you can use the device at home, at work, on the beach, wherever you want to know the values of the parameters which determine your comfort. (more…)
This prototype displays temperature, relative humidity, dew point temperature and absolute humidity
As shown in previous posts on the CarnotCycle blog, it is possible to compute dew point temperature and absolute humidity (defined as water vapor density in g/m^3) from ambient temperature and relative humidity. This adds value to the output of RH&T sensors like the DHT22 pictured above, and extends the range of useful parameters that can be displayed or toggled on temperature-humidity gauges employing these sensors. (more…)
Relative humidity (RH) and temperature (T) data from an RH&T sensor like the DHT22 can be used to compute not only absolute humidity AH but also dew point temperature TD
There has been a fair amount of interest in my formula which computes absolute humidity (AH) from measured relative humidity (RH) and temperature (T) since it adds value to the output of RH&T sensors. To further extend this value, I have developed another formula which computes dew point temperature TD from measured RH and T. (more…)
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