Datalogging

Data Formating Conventions:

When saving data to a flat file, separate values with a comma, ending with a linefeed character after each reading. Here's more on comma separated values comma separated values (CSV)

Data Logging Methods:

• Overview of Using Mysql
• Some simple Datalogging Best Practices

Mobile Logging

• From Computer's for the rest of you: DanO's Midlet plus processing code to analyze the data post logging.

Hardware Devices that Log

• logomatic

Computer/ Logging

• Tom's Processing/arduino example Graphs data while it logs it
• Jaime Allen's code to quickly write incoming serial data to a file
• Processing PHP My SQL Client Three pieces of code (Arduino, Processing, php) that you can use to write sensor data to a txt file on the network.
• Processing PHP Textfile Client Similar to the example above without the mysql

Data Smoothing and Filtering:

Tom Igoe's examples illustrate how to filter out noise from sensor readings in software in a variety of ways:

• The first method here uses Averaging and finding the median. For Arduino.
• The second takes a Weighted Average to smooth the values out and eliminate noisiness For Arduino.

From sensors to processing (without actually logging)

On some occasions, you may want to just graph the data without logging it. If so, here are some code snippets.

• Tom Igoe's Processing example reads three sensors and graphs one of them, but allows the user to choose which one by typing the appropriate sensor label.
• Multilogger by Jen Kirchherr. This is a modified version of Tom's Processing Datalogger Multi code that allows you to look at the output of three sensors at the same time.