This is the smarthomatic Wiki which describes how to build up the devices. You are invited to add your input when building up a device according to this wiki.
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setup avrdude
build your own firmware
flash the ATMega
soldering the RFM12B to the PCB
Soldering a LED to a cable
Antenna
Base Station
Environment Sensor (Generic Midi THT)
Environment Sensor (Generic Micro 2 SMD)
Power Switch
RGB Dimmer
Controller
Dimmer
Soil Moisture Meter
Thermostat Honeywell HR20/HR25