~derf / projects / Wetter
dark mode

Aktuelles Wetter in Dortmund Eichlinghofen; min/max beziehen sich auf die vergangenen 24 Stunden.

Alle Angaben ohne Gewähr.

Temperatur (West) 2.1 °c1.8 °c12.4 °c
Temperatur (Nord) -0.4 °c-0.8 °c6.7 °c
Temperatur (Schatten) -0.5 °c-0.7 °c8.3 °c
Luftfeuchtigkeit (West) 100 %100 %100 %
Luftfeuchtigkeit (Nord) 91 %73 %96 %
Luftfeuchtigkeit (Schatten) 100 %99 %100 %
Luftdruck 1016 hPa1001 hPa1016 hPa
Wind 11 km/h0 km/h100 km/h
Niederschlag 0.0 mm/h0.0 mm/h1.8 mm/h
PM10 14.9 µg/m³0.6 µg/m³36.6 µg/m³
PM2,5 3.0 µg/m³0.5 µg/m³10.3 µg/m³
Licht 7 lx0 lx23501 lx

Stand: 27.03.2023 07:00 Uhr


  • Bosch BME280 (Temperature, Pressure, Humidity via I²C). Works like a charm with the Bosch Sensortec BME280 driver
  • Maxim MAX44009 (ambient light via I²C) (max44009.py).
  • NOVA SDS011 (PM2,5 and PM10 fine dust particles via UART). Needs post-processing when used in high humidity environments, e.g. during fog or rain. I haven't implemented that yet.
  • TFA Dostmann 30x3161 (tipping bucket rain gauge / Regenwippe with reed switch). One impulse per 0.45mm (i.e., one impulse per 0.45l/m²)
  • WH1080 anemometer (with reed switch). Wind speed in km/h is number of impulses per second * 2.4; IIRC it's one or two impulses per revolution.


Data collection is managed by a Raspberry Pi 3 and two ESP8266 boards.

Raspberry Pi 3

Powered via a 12V mains supply and a 5V step-down converter. Will hopefully be powered via a solar panel from spring on – in winter, solar power is insufficient, so the panel is logging data but not connected to the RasPi.

Load 0.2 0.1 0.3
CPU Temperature 27 °c27 °c39 °c
Aux Temperature↑ 30 °c27 °c33 °c
Battery Temperature 1.4 °c1.2 °c14.8 °c
Battery Voltage 12.7 V12.7 V14.1 V
USB Voltage 4.83 V4.77 V5.02 V


The sensors are powered from individual 500mV solar cells and BQ25570 harvesters, and automatically adjust their duty cycle to keep battery voltage between 3.7 and 4.1 V. Source code: bme280 harvester.lua

Battery (Nord) 3.78 V3.78 V3.79 V
Battery (Schatten) 4.11 V4.09 V4.14 V