Arduino Data Logger

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Introduction:

This is a data logger I made for my class. I couldn't find any instructions that I could use to make the Arduino record the light brightness and the temperature. Then display the temperature and the light value on the LCD then Save it to the SD card

Requirements

   Collect data from at least 2 sensors
   write the data at regular intervals to the SD card, collect it in a comma separated variable file (*.CSV) that can be imported into excel.
   display the data to your LCD screen
   have the background color of the screen change somehow. Either from the data being collected (green background for nominal values, red for warning), or through the use of a button.