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I'm quite interested in SPI for other reasons and already have the module, but it's worth bearing 802.11 in mind if it proves difficult.
In theory it shouldn't matter if it's reset when the batteries are changed (as long as it can reconnect) since whatever persists the readings will use its own clock.
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I'm planning to build a wireless temperature sensor to assist someone in their hobby, brewing beer. Periodic temperature report is all that's required, no control at this stage.
I bought the NRF24L01+ kit, so the next steps are:
- Finding a temperature sensor suitable for immersing in liquid (with a sterilised cover)
- Working out how to power the Espruino for (at least) a few days. I have a few old phone handsets so I'm hoping to use the batteries. There is no mains power where the beer is fermented.
- Working out whether I need to use the other Espruino to receive SPI and communicate over serial to a linux machine. Ideally, I won't need to do this and can use SPI directly from the linux machine.
As you can see, the plan is very rough so far. And I haven't used SPI before so I'm not sure of the range or what I'll need on the linux side.
- Finding a temperature sensor suitable for immersing in liquid (with a sterilised cover)
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In the UK I've used http://oomlout.co.uk/ before.
They were excellent, correcting my order for me when I'd made a mistake and not even charging me the difference.
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Strange, I posted it here without issue just copying and pasting from your code:
https://meta.microcosm.app/conversations/183/?&limit=25#comment934
But I'll take another look tomorrow.
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Sorry folks - there were a few issues last night and I was on a train so it took me a bit longer to get to it. We're importing a large forum and this has resulted in a few slow database queries.
Gordon, you should be able to delete the empty threads now.