The DHT21 sensors used in the “Beelogger” are capacitive sensors used in modern electronic absorption hygrometers. This type of sensor uses a hygroscopic layer as dielectric between the two electrodes of a capacitor. The absorption of moisture in the dielectric changes its properties and so the electrical capacity of the sensor.
Measurement technology | Information on data loggers in beekeeping
Description and information on the measurement technology used in research on the hive climate of bees.
Data logger for the recording of climate data
The first self-made data loggers (beelogger solar SD) according to the instructions of Thorsten Gurzan (www.beelogger.de) go into operation!
- Waterproof housing, suitable for outdoor use, with screw-on device
Each measuring station contains 3 combined sensors for humidity and temperature, with an accuracy of ±0.5°C or ±3%. - Equipped with a real-time clock, i. e. the data is written with a time stamp. This real-time clock also records the temperature in the housing.