Relay board completion

I've finished the relay board and it's been working well for several weeks. We can now independently control up to 32 24V valves, expandable to 35, plus 3 spark plug igniters. I discovered that I had made some mistakes with the PCB design after all, when I received it which was a bit disappointing. Fortunately there were some relatively simple workarounds that didn't require carving up the board. I'm not sure if I subconsciously screened the design for really bad errors and just ignored the others. It just goes to show that absence of anxiety about a design should not be the only indicator of the quality of said design!

A reader asked me if we could swap links, so I have put a link to his ISS blog in the sidebar. Somehow, when I changed the blog design the old links were lost. I'll have to get around to adding some more soon.

I'm heading into a period of reduced busy-ness, especially following my final exam next week, so hopefully I can start posting a bit more often. There is certainly no shortage of topics to post about at the moment!