DIY Humiditysensors for Bayernlüfter

Selbstgebaute Feuchtigkeitssensoren für den Bayernlüfter

This project aims to aid at self-building sensors for the Bayernluefter by

• replacing them with cheap humidity and temperature sensors
• translating the data via Arduino-like microchips
• emulate the original HYT131 SHT31 temperature and humidity sensor

Hence this project includes

• some code to write data in the HYT131 SHT31 format
• a framework to plug the data from one sensor to the other

Who is this project suitable for?

Anyone with a bit of joy in tweaking code. Essentially the only knowledge required is how to include a sensor library and set it up as well as read the values from the sensor afterwards.

How to set up?

Place your code which reads temperature and humdity values from a connected sensor in main.ino. Do your own sensors provide data in an integer format or double? Modify the defintions at the top the file accordingly. Make sure that the global values cur_temperature and cur_humidity are set on a regular interval.

Have a look at the configuration in config.h. Compile twice, once with ITC_ADDRESS set to the address for each sensor and upload the matching code.

Where can I find example setup code?

Modified code that fits for a certain type of sensor can be found in the branches of this project, see for example the code for using the DHT22.

FAQ

The images on the website of Bayernluft show that HYT131 is used. Why do you implement SHT31?

We actually ordered the sensor-kit from Bayernluft and it includes the SHT31 and not the HYT131. Also emulated HYT131 code would not work, SHT31 emulation did though.