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The goal of this project is to control Velux blindfolds or windows by a Raspberry Pi. For this purpose the project is divided into a hardware part and a software part. The difficulties about Velux is the proprietary RF-protocol which they are using for communication.
The hardware part modifies a Velux KLR100 remote control. This seems to be the cheapest way to access the windows, because the KLR100 is in scope of delivery.
The modification simply connects the buttons of the remote control to an optocouplers. The opposite side of the optocouplers are then connected to the Raspberryi GPIO pins. The optocouplers are needed because the KLR100 is using a 2x5 button matrix. A button matrix means that the buttons are connected in the following way to the microcontroller:
In my case I've used two Toshiba - TLP291-4 to connect the up button and the open/close button. The following circuitry was used:
I've used some magnet wire to connect the button traces on the backside of the PCB (see image).
