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Author: meteodrenthe

Reading RG-15 Rain Data on a Wemos D1 Mini Using SoftwareSerial

Posted on August 29, 2025August 30, 2025 by meteodrenthe

In this post I explain how I use the Hydreon RG-15 in tipping bucket mode. This involves the J1 connector and listening for “tips”. The RG-15 also has a J2 connector which allows for serial communication between the device and the microcontroller – in my case the Wemos D1 Mini. The documentation explains what commands…

Reading the Hydreon RG-15 using a Wemos D1 Mini

Posted on August 17, 2025August 24, 2025 by meteodrenthe

During previous summers I have always been busy with temperature sensors and radiation shields. This year, I have shifted my focus to precipitation. The main reason why I find this interesting is that our warm seasons have seen quite a few dry spells over the past few years. This causes all sorts of issues, but…

3D printing a Davis UV/Solar mounting bracket

Posted on August 7, 2024September 13, 2024 by meteodrenthe

The Davis Instruments solar radiation and UV sensors require a specific mounting plate. As far as I’m aware, there are two options available. You have the sensor mounting shelf which can be attached to the rain collector. Then you have this universal mounting bracket. It can fit one radiation sensor. It also comes with the…

Unboxing the SIAP+MICROS SMarT CELLino radiation shield

Posted on July 29, 2024July 29, 2024 by meteodrenthe

It’s Summer. A good excuse to get a new radiation shield. Earlier this month I received a new model from SIAP+MICROS: the SMarT CELLino. As the linked article mentions, the shield is created as a collaboration between the Italian company and Marcellino Salvador. That explains the name of the product. Most of it anyway. 🙂…

Good barometers: the BMP388 and BMP390

Posted on June 8, 2024June 9, 2024 by meteodrenthe

Barometric pressure is considered to be one of the less interesting metrics to measure with a personal weather station. As a factor in global weather predictions it is very important, but in terms of current conditions we learn a lot more from our thermometers, anemometers, rain gauges and other sensors. Especially if we are considering…

Reading fan speed from the Barani MeteoShield Pro fan-aspirated model (FARS)

Posted on May 1, 2023May 1, 2023 by meteodrenthe

In this post, I explained how I use a Wemos D1 Mini microcontroller and a MOSFET module to control the fan speed of a wired fan-aspirated MeteoShield Pro from Barani Design. I am also testing a model with a fan powered by solar panels. Both come with two additional wires connected to a reed switch…

Controlling fan speed on a Barani Design prototype fan-aspirated radiation shield

Posted on April 28, 2023May 10, 2023 by meteodrenthe

Recently, I was fortunate to receive a new prototype model of the fan-aspirated MeteoShield Pro from Barani Design. On this version, the solar panels are replaced with two power wires, making it possible to connect an external power source, allowing the fan to be active 24 hours a day. Varying fan rpm is possible by…

How to use the Ecowitt Gateway (GW1000 GW1100) local API

Posted on February 3, 2023August 15, 2023 by meteodrenthe

Using Ecowitt weather sensors often means using their WiFi gateway to process sensors updates. It offers a web interface that allows you to configure several weather services like Weather Underground, Weathercloud and others. But what if you have other plans with your data, like exporting it to your own database? There are several ways to…

The B parameter vs. Steinhart-Hart equation

Posted on September 7, 2022March 10, 2023 by meteodrenthe

In my previous post about reading thermistors with a Wemos D1 Mini, I observed resulting output seemed a bit high at lower temperatures, while readings were lower compared to other sensors at higher temperatures. (If you haven’t read that post yet, you may want to check that first in order to understand the starting point…

Getting accurate NTC thermistor readings with a Wemos D1 Mini

Posted on August 7, 2022July 3, 2025 by meteodrenthe

A thermistor is a very common type of thermometer. They are cheap and readily available in many forms. Thermistors are simple devices. A thermistor is basically nothing more than a resistor that changes its resistance with temperature. Very popular are 10K NTC thermistors. Negative Temperature Coefficient (NTC) means that resistance drops when temperature rises. 10K…

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My personal weather station is located in a small township in the North of the Netherlands.

This blog records updates to my setup, development of components, weather reports and anything related.

Real time data generated by the weather station can be found on meteodrenthe.nl.

Some products and technologies in use:

Davis Vantage Pro 2

Davis AirLink

Davis WeatherLink Live

Barani MeteoShield Pro

Apogee Instruments TS-100

Davis 7714 radiation shield

MetSpec RAD14 radiation shield

Vaisala DRT504

Siap+Micros SMarT CELLino

Wemos D1 Mini microcontrollers

Bosch BMP280/BMP3xx pressure sensors

Sensirion SHT35 temp/hygro sensor

PT100 temperature sensor

10K NTC thermistors

Adafruit breakout boards

ADS1115 analog-to-digital converter

Light intensity sensors

Voltaic Systems solar panels

Foscam FI9900P weather cam

Raspberry Pi Zero W

Custom printed circuit boards

C++ (Arduino code)

Java (server backend)

Angular Framework

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