@Ron, Yes, thank you. The sketch-that-worked-before problem was solved by the edit to make it compatible with the updated libraries, and the rest is...

@frogandtoad, Thanks. Fritigern

@Ron Thank you very much for taking the time to reply to my rant, and supplying the fix. So the original Bill- based sketch worked fine until I up...

@zander Thank you for the steer and the resource names. Fritigern

First part solved. For the first time in many hours a google search for (missing library).h resulted in a site prepared to give me a zip file. Which w...

OK I have sorted it. 1- nervous breakdowns- these were caused by running the arduino off the 12volt power supply. Everything always worked when it w...

@davidl, I know how you feel re soldering and am an amateur home solderer with limited dexterity who does not look forward to doing it. Everyone has...

Thank you both. My code passed the tick box check, the superfluous (constrain) and (map) commands are a signature of asking Mr Google too find simil...

OK about five more hours wasted and a tiny bit of progress I tried simple sketches from the link above, as follows As the article does nit use...

@Will, @RobotBuilder, Thank you both for replying. I resolved to read the linked page after I had screens hotted, photographed etc what was happenin...

PS despite the dozens of combinations I have tried, every single one has given me "init failed". Ta

Thank you, I'll try it without the shield and wired like that. That will also exclude the both sets of wires/plugs I used, which could both have a fau...