I like TR-52D series IQRF, but in some cases, these modules has insufficient number of IOs (6 only). I mentioned this issue in this post. Unlike Relay board, I want 8 input pins (and more). So the simpliest way, how to do It, is port expander usage.
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This article is simple demonstration, how to use popular shift register 74HC595 as output port expander for IQRF TR-52D module. I use It as simple remote switch unit for my workshop at oposite side of garden. Simply, from serial terminal or single purpose software written in C#.