Does a Raspberry Pi need a UPS to avoid SD card corruption?

In the past I’ve had trouble with corrupted SD cards when power was removed from a Raspberry Pi without shutting down the OS. But this failed attempt to build a UPS for the Pi has, as a side effect, tested powering down and back up over 50 times without a single failure. So are SD corruptions a thing of the past?

robDoes a Raspberry Pi need a UPS to avoid SD card corruption?

.NET Micro Framework Web Server Unreliability

I have built a couple of home-automation devices using the Netduino Plus 2 and, until fairly recently, was pretty happy with them. Certainly the process of development using the .Net MicroFramework is really excellent – it is nothing short of miraculous to be able to debug embedded code in a desktop environment. BUT neither of the devices was totally reliable …

rob.NET Micro Framework Web Server Unreliability

three ajax problems in my Phonegap app

I’m working on a Phonegap application to run on tablet computers on the walls in my house. I’d been making good progress and enjoying it – using CoffeeScript and LESS for the first time in anger and trying out Sublime (with some plugins) which I’m also very happy with.  But yesterday I started on what I thought would be the …

robthree ajax problems in my Phonegap app

a qt stock ticker

a simple stock ticker using Python and Qt

roba qt stock ticker

drawing straight lines with a Polargraph

Well, I have been busy with other things but hankering to get the Polargraph I got as a kit from Sandy Noble to plot lines as straight as possible.  The process wasn’t as simple as I’d expected for quite a number of reasons including, as often seems to be the case these days, an overestimation of my ability to remember …

robdrawing straight lines with a Polargraph

polargraph from Sandy Noble

A few weeks ago I ordered a Polargraph kit from fellow Edinburgh resident Snady Noble at www.polargraph.co.uk After sitting on the shelf for a little while I found the time to build it and try out a couple of plots using Sandy’s software which creates pleasing drawings from bitmapped images.  Here are a couple of plots.    In the cat …

robpolargraph from Sandy Noble