So we’ve been having difficulty getting the underwater fish cam streaming reliably – and now that there is a higher-powered Pi around I thought that I’d try upgrading the basestation of our Aquaponics control system to see if the extra ooomph helps. But of course, there are new problems – such as our old way of […]
Read More…Idle Timeout in Express
Idle Timeout was not possible in express sessions until recently. You could set maxAge on the session’s cookie, but that would make the cookie expire after the given time regardless of activity. But it is more usual to want to expire the session after a certain amount of time with no activity. That is now possible […]
Read More…ESP8266 modules hardware guide – gotta catch ’em all!
OK so there is this new(ish) chip the ESP8266EX that promises a full wifi stack and a mcu all for £2-3. But the chip on it’s own isn’t so useful – so most of the excitement has been around the various modules made with the chip, some memory and an antenna or connector for one. […]
Read More…Squatconf Presentation
We’re at SquatConf. It’s amazing! All conferences should be in squats. (Ones that serve good quality beer on draft, in particular. And where you can have a cigarette while you’re presenting). Here are the slides for the presentation we just gave. And here’s our alternative translation of the heart sutra (now on Github!) Avalokitesvara the Origin Mistress […]
Read More…thethingbox.io image – testing and extending
I’ve started investigating the http://thethingbox.io/ image – they say ‘Just download and write a Raspberry-Pi binary file on a SD card to get it ready!’ Well, that’s mostly true – but I found a few issues once I logged on to it via ssh that I’ve documented here, mostly easy to fix once you know how. […]
Read More…Open aquaponics API, documented with Swagger and sample app
We’re proud to release the first public iteration of our Aquaponics Open Data API. You can see it live here – and we are very keen to get feedback, suggestions, improvements and collaborators in true open-source fashion. Our goal is to allow others to write applications to use data from our systems for their own purposes, as well as reusing […]
Read More…Wireless pH sensor
JeeNode + MinipH + LiPo + Case = Wireless pH sensor This sensor is probably the one I’m most proud of so far, all the elements came together really well despite having to hack the MinipH circuit in the literal sense! The enclosure maketh the project As soon as I had finished making this sensor, […]
Read More…Node-Red on Raspberry Pi with RFM12B support
You can find these rfm12b modules on sale on ebay – I paid about £10 with delivery and it arrived promptly, the seller chacal_zoom seems to have a number of interesting little circuits, specialising in minimum parts and tiny boards! (avoid the bedini circuit tho he he he!!!) After seemingly endless weird problems getting the […]
Read More…Reading multiple sensors – rfm12b_linux and node-red
RFM12b module vs. Jeelink This post follows on from this one where Gareth explains how to use an RFM12b module with an RPi. To recap, the RFM12b module is a radio transciever like the Jeelink, but it is much cheaper. It is, however, slightly harder to use. The Jeelink connects via USB and is immediately exposed as […]
Read More…Node-red web page – an example to get you started
NB: I no longer think this is a good way to do this! It was a first go, and there is a lot wrong with it. I intend to revisit the web-page idea at some point, and will post something better then. Now we use Freeboard to display data – there is a freenode node […]
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