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Gary Parker
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They Made Me Do It
They Made Me Do It

131 followers
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Fantastic compilation video of first person video from some quad-copter stunt flying

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I could do with some help/advice on a statistics problem. I'm hoping +Arron Shutt or +Matt Hill will know the right direction to go in. I'm logging environmental data (temperature and relative humidity from a DHT22 and air pressure from a BMP085) to a Google spreadsheet and drawing some graphs with the data:

http://delphium.lboro.ac.uk/fk_env_charts.html

(FYI, I've manually removed all the spurious entries from that dataset)

Sometimes the DHT22 spits out obviously spurious readings, almost always both the temp and humidity being wrong (ie. temp jumping from 21°C to around 40 then back down again for the next reading.

I'd like to code in some sort of check that stops the routine from logging these spurious results from the sensor. I could set a simple floor and ceiling for expected values but that wouldn't catch jumps within that range. I'm thinking along the lines of measuring the average difference between subsequent readings in the dataset (or a subset of it) and flagging anything that falls outside of a bound based on that figure. I recall doing standard deviation in A-Level maths and it being something along these lines.

Any ideas? I know I'm probably reinventing the wheel, but if anyone can show me the blueprints for the wheel I'd appreciate it.

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Via James Davis (@JanetInfoSec) on twitter. Clue: it doesn't end well...

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In a spectacular display of cluelessness, populist behaviour and potentially dangerous intent, David Cameron made some rather ill-conceived proposals yesterday regarding the use of encrypted computer communications in the UK. You can read reports with varying levels of ire and technical detail across the web today, but Cory Doctorow does a very good job of explaining the shortcomings in this article over on Boing Boing. I'd urge everyone to read this...

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Tweaking The WiFi For Wii U
We got a Wii U for Christmas, lovely piece of kit (if you like Nintendo, obviously) and one of the nice touches is a big gamepad with its own high resolution screen that you can actually play most of the games on without having to hog the TV to yourself. Th...

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Of Netflix, VPNs and "Piracy"...
If you're a Netflix subscriber (or maybe even if you're not; this may be one reason why you don't subscribe) you're probably aware that the TV shows and movies available through their streaming service vary significantly from territory to territory. A lot o...

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Why 1080p Internet TV Is A Scam
While on our work Christmas night out yesterday (yummy beer at Das Kino and Brewdog and yummier food at Tarn Thai in Nottingham) the subject of streaming Internet TV services came up in conversation and I tried (not helped by 3 or 4 pints of Vedett IPA) to ...

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Top 10 Albums of 2014
My 2014 Top Artists Cloud - last.fm and dontdrinkandroot.net As is by now entirely predictable, almost tediously so, it's time for a look back over the music releases of the year and for me to decide which were my favourites. Let's get two things out of the...
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