KM271-WiFi (WiFi enabled replacement for the KM271)

This piece of hardware is a direct replacement for the Buderus KM271 to control a buderus heating system with Logamatic 2107 controller board. Maybe other controllers are supported. Please file an issue (or better a PR) if you have my module running in other Buderus heating controllers, so I can add them here.

This hardware and its documentation is released under the TAPR Open Hardware License Version 1.0 (May 25, 2007). A copy of the license is included here or can be accessed in multiple formats on tapr.org.

For more details, look on

• in the hardware description
• my blog post
• interactive BOM
• tindie.

If you bought the board in my tindie store, you could find a how-to to get it running here

This is a rendering of the board as it will arrive soon (Version 0.0.7):

This is the board as I shipped it lately (Version 0.0.6):

This is version 0.0.5:

Improvements / ToDo

• Add a OneWire temperature Sensor on the board itself
• Fix a minor bug with external I2C pull-up (tie them to PCA9306 selectable supply)