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=Controller and data transmission= Is Arduino going to be our platform? Here's a possible design: An arduino hooked up to a bunch of different probes and in turn hooked up to either an ether/wifi shield or a full linux box (I've previously used the excellent and tiny 1 watt [http://bifferos.bizhat.com/ biffer board] in this manner). As data comes in it should be timestamped, categorized (pH, temperature, etc) and sent (via shield or pc) to a server somewhere on the internet using e.g. JSON over HTTP post. The server would run a custom web app (e.g. Rails) that receives data, logs it to a database and generates graphs on demand. Add a Comet server and the graphs could be live-updated as the data comes in. We could add features that lets new users sign up and get a unique key which they use when transmitting their own data to the JSON web service on our server. The server then uses the key to associate the data with the user, and the user can look at their graphs and share them with others. We can implement the "export to CSV" on the server side, allowing users to analyze the data using the tool of their choice. If we put all of the code on github, then others can easily fork the code and add their own features. To me, the hardest part of this project will be finding/building cheap measurement probes that are accurate enough (how accurate is enough?) and require little or no calibration. - ([[User:Juul|Juul]]) ==Sensor data collection== Which board would be optimal for our purposes? Does this depend on the sensors? ==Wireless data transmission== How? Immediate suggestion would be ethernet shield, but others options are available and perhaps preferable.
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