OpenSprinkler Forums Hardware Questions OpenSprinkler Pi (OSPi) How to read current station status? Re: Re: How to read current station status?



By the way. You mentioned that you are struggling to understand shift registers. This article offers a good explanation: This will also explain why the the complete state of the controller has to been reset each time a station is opened or closed. The shift register is cleared out and 8 new bits are sent to the register (or more if you are using an expander board; the linked article also explains how shift registers are daisy chained, which is exactly how the expansion boards work — I think).