Raspberry Pi Projects

You can read the first part of this blog here, and the second part here. Research (or mucking about with stuff) The first job was to buy a Pi screen and fingerprint scanner. I already had a Pi kicking around looking bored. A quick session on the interweb saw me securing a screen from Pimoroni and GT-511C3 finger print scanner from Proto-Pic. The Finger Print Scanner is ideal. It is a self-contained unit that stores the fingerprint templates locally, all you need to do is ask it for the unique ID of the finger print on the scanner. This can then be cross referenced to a person. It connects via a serial connection (0-3.3V rather than 0-12V of standard RS-232) which is ideal for connecting to a Pi or Arduino UART. There was a cheaper version but that could only store 20 fingerprints, this model can store 200, which is more than we should ever need. The only problem was there were none in stock, but that was OK because Proto-Pic said they could get more stock within a week. 

You can read part 1 of this post here. The Solution The existing solution, which less we forget has worked for many years, requires users to remember a unique ID number and enter this along with the codes for the products they’ve used. How can we make this better? Well there are many options available for a better input method. Rather than remember a unique ID it would be better to use some kind of sensor to detect something unique about the user. This could be something issued to the user like an RF-ID card or tag, like the London Underground Oyster card or the tags we use to log in at the Maker Space. However it would be cooler to use some form of biometrics as cards and tags are easily left in a drawer, lost or left in a pocket and washed. It’s a damn site harder to leave your eyeball in a draw, and washing your hands is generally a good thing.

The Problem. [caption id="attachment_4603" align="alignright" width="300"]kitte620x300 kittE - Logo Design (always important)[/caption] I work in a mixed discipline development office (electronics, software, mechanical & project). Now everyone knows that the world of development runs on a mixture of ideas, experience and lots and lots of tea and coffee. Software types might favour the buzz of an Espresso, project management types might prefer an organic wheatgermskinnymochachinofrappe or whatever GQ reckons is cool this week, electronics types might go for a nice strong instant coffee of some kind (to clear the solder fumes) and grease monkeys will usually go for a mug of tea (stirred with a screw driver).