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Step 12 says “Please see Step 4 on how to change the sensitivity of your raindrop module board!”, but step 4 does not mention anything about setting sensitivity. I assume it is the on board pot, however the only thing this seemed to affect was whether the signal LED displayed, but didn’t seem to change the actual moisture sensitivity.
The analogue value dropped from around 1000 to around 700 with some water droplets, and the lowest we achieved was 340 while the sensor was submerged in a cup of water!
Changing the code to test for less than 800 seemed be the best way to make it work.