Automated IKEA curtains controlled over Wi-Fi (Siri and Web) using the ESP8266 chip. The motor mount and belt tensioner are custom designed and 3D printed on my RepRap. The system is driven by a T2 belt.
The belt tensioner has been designed such that it can just be snapped on the IKEA curtain rod. The motor mount uses a part of the IKEA L-bracket to resist against the high torque of the motor.