So at the weekend I have a little time for my OS and I have had change my “Quick&Dirty” solution to a much better solution.
Its much simpler, to convert Gardena-sensors: connect Gardena-Sensor to OpenSprinklers sensor connector directly and make a 4k7-PullUp from the left pin (go to Atmega) to +5VDC (Pin 1 of External Connector). Thats all, its all done!
To indicate, if rain ist alert, it’s possible to switch a LED between left pin from sensor-connector to +5VDC (catode on sensor pin, anode over about 500 Ohm to 5VDC).
Maybe it helps others, to connect the european Sensors easy to OpenSprinkler 😉
