What are the units on the light graph? Lux,etc.?
The sensor is a light dependent resistor. The data is inverted and scaled roughly so that the brightest sunshine should be around 1024 and darkness is 0.
The Arduino will eventually become an outdoor weather station once I have a PoE ethernet shield.
The weather station data will be used in two ways...
1. Logged as simple weather data
2. As input into a bespoke heating controller (a work in progress), in order to create a more efficient central heating system
For 2, I only really need the light data to further qualify the temperature reading (whether the sun will effect it or not) so the actual value (Lux or otherwise) is not important to me.