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After my test of the rain sensor last night, I decided it would be a good idea to add an audible alarm to the rain detection just in case I'm not looking at the computer at the time. That turned out to be quite straight forward and I gave it a test today by manually adding a drop of water to the sensor. Everything worked as planned.
I've also done a bit of work on the Arduino code to select the gain settings for the TSL light sensor in a more robust way. It now has a day and a night mode and automatically switches between the two depending on the light level.
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