Are my blog posts of interest and/or appropriate

All powers to the content creators. Your blog - and any engineering bog - is very welcome here. Thank you.

The rules do not requires any special form of blog. Everybody can create whatever blogs he/she wants. Usualy blogs should describe your progress as part of competition or show some interesting results or findings including, for example, showcase of unsuccessfull ways. Some design challenges requires two blogs, some five. Many members use first blog for describing their idea in theory at the begining before the project is build and last blog for showing the final implemented project. Remaining three blogs they use for showing some interesting parts of the project, or just for wiriting about their progres or about interesting technology which their found when impelementing or whatever else. If you are familiar with makling videos, you can of course record the video and post simple blog post with video included. But very few people do this as part of Design Challenges. Sometimes somebody choose video form for RoadTest review instead of written text.

Your blog is completly fine.

Alistair You are right on track.  Content, not format. 

Sometimes I too feel this way. I started engaging with the community only for the past few weeks. Sometimes I see the engagement experienced member's posts get and found those posts are open for conversation, as opposed to the one that I post which are mostly an open and shut kind of experiment details. 

I am trying to make my upcoming posts more engaging and insightful meanwhile sticking to the content. 

As a blog, it looks fine, admittedly I only scanned through it. I have not used those parts (but the one part immediately relevant, concerning One-Wire and I2C, I already commented on in your previous blog). It could do with a bit of sprucing up (It is still useful blog content regardless), it's just a personal opinion. Perhaps rephrase the title to "Temperature Sensors: Compared and Contrasted!". And links to each sensor, because a user may have no idea what the benefits are for each one (perhaps it is already in a blog in which case a link to it would be good to add). Your content would barely need to alter, it is work you've done, you're now the subject-matter expert on that topic, so you're in a position to express it in any way, and it is still useful.

Also, some blogs are slow burners, waiting on people to search it out when they are having problems. But one should also document for themselves, i.e. make the blog relevant to their own needs too, and then it's never a waste. Besides, interest is contagious. If the author is not interested in it, then it's hard for readers to be enthused either (I don't have any specific blogs from anyone in mind, I'm just talking generally).

If you specifically meant how is the blog in the context of the competition, if you're unsure, if it were me, I'd check out a few blogs from past competitions just to get a rough idea. However, more directly relevant, I'd definitely read in detail the competition announcement pages, and any rules.

From what little I've seen, occasionally a contestant or two in competitions may get bogged down with one thing or another, and might forget about the aim of the project. I remember once seeing some competition project a while back, where one of the contestants forgot to use any of the supplied parts. It kind of missed the point of the competition it seemed.

Anyway, all the above is just an opinion.

Hey Alistair

Thanks for the question, you have had some great answers from some real hard hitters below. 
I have to agree, the blog looks great, Conversation and group problem solving is also encouraged. 

We really enjoy hearing the story of how you are finding it, as well as the technical information. 

Its coming along well. 

Phil from e14

Thank you all for the positive feedback. It is much appreciated. It is also good to know I am not the only one wondering.