Overview

Inside our new home we have an KNX http://www.knx.org automation bus. I have not found an nice looking "RoomSensor" which has the following sensor equipment:

• temperature
• humidity
• brightness
• passive infrared motion (PIR)
• smoke detector
• CO2

Components

so i decided to build my own. After looking what is possible i choosed the following components:

• ARM Cortex-M3 microcontroller
• SIM-KNX bus coupling from http://www.tapko.de delivered by http://www.opternus.com
• http://www.sensirion.com SHT21/SHT25 (temperature + humidity)
• http://www.taosinc.com TSL2561 (brightness)
• http://www.hygrosens.com miniature motion detector (PIR)
• http://www.gira.de smoke detctor modular VDS (smoke detector)
• http://www.driesen-kern.de K21 (CO2)

UUID used for iBeacon funtionality: C8A8F392-D8ED-47EA-85FE-0EB1903425AD