The YL105 datasheet is good, but it misses three practical details. Knowing these makes your usage than 90% of other engineers.
: Eliminates the need for external voltage dividers or dedicated 3.3V power supplies that may not provide enough current on certain Arduino clones. yl105 datasheet better
The sensing pad doesn't "detect" water like a camera sees it. It relies on conductivity. The YL105 datasheet is good, but it misses