I have a webcam in my conservatory that is connected to a Raspberry Pi. You can see it at the top right of the picture with the red LED just under the air-conditioning unit. When it rains the sound of the raindrops on the roof is very loud and I thought I could use the microphone in the webcam to estimate the amount of rain. The Raspberry Pi also controls my irrigation system, and I wanted to reduce the water consumption by stopping the irrigation when it has rained.
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