In my previous post I addressed the power supply needed to run the Apogee Instruments TS-100 fan aspirated shield in my setup. The next step is building a controller for the fan that allows me to vary the fan speed and read the actual rpm being achieved. The idea is that the controller can query…
Author: meteodrenthe
Project Apogee part 2: power supply
Project Apogee requires me to rethink the power supply of my weather station. When I start writing this, the Meteodrenthe weather station runs on solar power only. The Davis components have their own panel inside the transmitters. Other custom elements use 2 watt 6 volt panels by Voltaic Systems. This has been an ideal solution…
Project Apogee part 1: fan aspiration
My big project for the summer of 2021 is adding a fan aspirated radiation shield to my setup. My primary shield – the Barani MeteoShield Pro – is a superb product, but a passive shield it remains. It suffers from overheating in windless conditions. Those conditions do not occur too often at my location, but…
Mei 2021 was koud en nat
De vijfde maand van 2021 is ook de vijfde koudere maand op rij. Na een zeer koude april is ook mei met een gemiddelde van 10,62 graden bijna 3 graden kouder dan gemiddeld (normaal ~13,4). Het referentiepunt voor weerstation Lieving, het KNMI in Hoogeveen, eindigt met een gemiddelde temperatuur van 10,76. Mei was bovendien erg…
Tuning the AS3935 lightning detector
As I pointed out in my previous post on the AS3935 lightning detector, the AS3935MI library available through the Arduino IDE works quite alright. However, every time I boot the Wemos D1 Mini with it, I get a warning that the calibration of the resonance frequency failed. As per the datasheet, the frequency needs to…
AS3935 lightning detector with Wemos D1 Mini
Lightning detection has been on my wish list for my weather station for some time. Detectors often come as stand alone units with a display or indicator LEDs. This makes sense when the use case involves taking it along as a hand held device or installing it on your boat. However, in order to process…
April 2021 was zeer koud
Deze conclusie was halverwege april al in de maak. Overal in Nederland viel de temperatuur ver onder het langjarig gemiddelde uit. Dat is ook terug te zien in de statistieken van meteodrenthe.nl voor deze maand. Op weerstation Lieving bleef de gemiddelde temperatuur uiteindelijk net onder de 6 graden steken met 5,99°C. Dat is bijna 4…
Weather patterns: April 5th 2021
Early morning on Monday April 5th 2021 saw an interesting weather pattern shift that was very noticeable in almost all reading types; temperature, pressure, wind direction and air quality. Weather reports had already predicted that in the night towards Monday, polar air would enter the Netherlands, temperatures at altitude would drop to -40 and we’d…
Monitoring radiation shield performance
Spring is here. Today was the first ‘warm’ day (> 20°C) of the year. Conditions where solar radiation errors will start cropping up in the temperature data. Accuracy of temperature readings is a surprisingly complex subject. But any attempt to get accurate readings starts with shielding the sensor from direct or indirect sunlight and ensuring…
WeatherLink Live, local API and barometer
A few weeks ago, I made the switch from reading my Davis sensors with the Meteostick to the Davis made WeatherLink Live. Though I still like the concept of the Meteostick, the reception is fairly poor and sometimes it would stop receiving data and require a reboot. One thing you don’t have with the WeatherLink,…