Simple Webcam on Raspberry Pi

The Raspberry Pi’s low power consumption makes it well suited to the role of always-on server. This post describes how to attach a simple webcam to a Raspberry Pi and have it take a snapshot every few minutes, and how to view the pictures on the web. Just like a traditional webcam.

My Raspberry Pi was purchased from New It in the UK. It was installed with Debian 7 (“Wheezy”) by applying the image “” downloaded from the downloads page. The following procedure was then performed without any further pre-work (other than enabling ssh in the basic setup). Continue reading

bc Rounding Errors

There must be a few people out there who still use bc as a desk calculator. bc is a simple application that comes as standard on most unix and linux systems. It’s nicer to use than a graphical calculator app: less fussy, no mouse needed and you can see what you have typed.

bc Gets it Wrong

A recent mix-up with financial calculations lead me to discover that – unbelievably – bc was getting its sums wrong. This post explains the problem. Continue reading