As shown in our post about Raspberry PI 2 | Not Ready for real-life-embedded Apps we built a system to connect a SainSmart relay with the Raspberry Pi’s GPIO.
The first tests where done with the microcontrolers directly soldered to the connectors, but for a larger scale use as for home automation systems, we developed a PCB board.
The board has a low profile, was designed to fit to the Raspberry Pi mounting holes and use standard flat cables to connect to the Pi, the relais and an external power supply.
Here you can download the KiCad plans of our open hardware board: PiSaint
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