The folks at Swindon Makerspace took possession of a new space a few months ago after a long time in temporary accommodation. They’ve made impressive progress making it their own, and are the envy of their neighbours.
A small part of the new space is a temperature logger, and it’s one whose construction they’ve detailed on their website. It’s a simple piece of hardware based around a Dallas DS18B20 1-wire temperature sensor and an ESP8266 module, powered by 3 AA batteries and passing its data to data.sparkfun.com. The PCB was created using the space’s CNC router, and the surface-mount components were hand-soldered. The whole thing is dwarfed by its battery box, and will eventually be housed in its own 3D printed case. Sadly they’ve not posted the files, though it’s a simple enough circuit that’s widely used, it looks similar to this one with the addition of a voltage regulator.
The device itself isn’t really the point here though, instead it serves here to highlight the role of a typical small hackspace in bringing simple custom electronic and other prototyping services to the grass roots of our community. Large city hackspaces with hundreds of members will have had the resources to create the space program of a small country for years, but makers in provincial towns like Swindon – even with their strong engineering heritage – have faced an uphill struggle to accumulate the members and resources to get under way.
So to the wider world it’s a simple temperature logger but it really represents more than that — another town now has a thriving and sustainable makerspace. Could your town do the same?
If you’ve never used a Dallas 1-wire temperature sensor like the one the Swindon folks have in their logger, we suggest you read our primer on the parts and their protocol.
Why not use a cell phone battery ?
Hey it’s Swindon, half the population still probably lugging an accumulator cell down to the radio shop to get it charged once a week, so they can listen to The Archers. ;-)
I’m sure they’d sentence you to five years trying to exit the Magic Roundabout for saying that. But I would hope the aged technology of choice for Swindonites might involve shoveling a ton of finest Rhondda steam coal into the firebox of a Churchward boiler to raise power :)
Why 3 AA batteries? I’ve been running mine off of 2 of them. they run on 3 Volts to 2.5 volts just fine. Use a DHT sensor and you can eliminate the board and most of the parts. on the board.
They might be rechargeable 1.2 volt NiMH.
How does using a DHT sensor instead of the DS18B20 allow you to eliminate the board and most of the parts?
If I had a temo. logger today all it would say is “Hot as f**k, hot as f**k,hot as f**k…”