Lots of Bits

Lots of Parts - or toys as my partner calls them
Lots of Parts - or toys as my partner calls them

Wow, loads of stuff just arrived for me for building the controllers: Here's what came from where:

A couple more Arduino Boards and some spare ATMega processor chips from

I've got a programmer for the ATMega processors from ebay seller Sure Electronics in china: £15+shipping vs £100 in the UK. I hope it works...

The Maxim One-Wire controller ships have been soldered onto mounting boards [incredibly quickly] by Tirna Electronics

There is some more RAM for the MacBook from Offtek

A nice box mounting USB connector from Maplin

And the start stop switches which Andreas sourced from I don't know where.

Application Design

I've come up with a final application design I'm happy with and confident will work. Now to start implementing it all.

There will be numerous components in the system, and it's a pretty loose description, but it will do the job.

Data Collector

This will be based in the collector box, running a piece of software on an Arduino base ATMEGA Micro Controller. The program will check for presses of the start button, signalling a listener application on the connected MacBook that the mapping has started. It will then wait for the stop button to be pressed, and collect the data from across the 8 wire networks it can be attached to, and transmit that information to the main computer along with a stop signal.

Listener Application

This will be a background application on the MacBook, which will listen for signals for the data controller. Upon a 'start' it will create a new mapping, and grab co-ordinates for the floats location from the GPS device connected to the macbook, as well as logging the start time and creating a unique ID for the map. When the stop signal is recieved it will log the information gather from the various circuits into a database.

As we won't have a 'live' internet connection on the float this application will also listen for an active internet connection and upon receipt start synchronising data with he primary server were the website lives, uploading new maps and downloading any data that's changed on the website.

Display Application

This will be an application that will run on the laptop on the float, and also on the website for the project. It will work slightly differently for each context, but visually will be mostly identical. It will display the latest map available, as well as allowing exploration of the maps and augmentation of the data collected.

Web Synchronisation

This will be a backend application that will be triggered by the listener application, and handle the details of synchronising data with the main server.

a public works project. site design and build by dorian