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Post: We have a C library for the IO Pi which includes some demos for writing and reading to the IO Pi bus. You can find them on our GitHub repository at [url=https://github.com/abelectronicsuk/ABElectronics_C_Libraries/tree/master/IOPi]IO Pi C Library[/url] One thing to be aware of when driving relays with the IO Pi Plus is each chip can only supply 20mA per channel and a total of 125mA per bus so you will probably need to use a transistor or Darlington array to drive the relay coils. We have a design for a 16-channel relay board that works with the IO Pi Plus which we have made available for anyone to download and build themselves, you can find it in our Knowledge Base at: [url=/kb/article/1060/relay-board-for-the-io-pi-plus-2]16 channel relay board.[/url] We do not sell the relay board ourselves at the moment but you can use the supplied Gerber files order PCBs from a supplier like [url=https://jlcpcb.com/]JLC PCB[/url].