The is a fantastic, cheap, and reliable analog sensor for non-critical applications . Want to know if your plant needs water? Perfect. Want to know if your basement flooded? Use a float switch or a corrosion-resistant probe instead.
: Allows for a high-voltage, high-current output in a tiny form factor. Low Quiescent Current Hw-133-v1.0 Datasheet
Connect the power source only to the IN+ and GND terminals. The is a fantastic, cheap, and reliable analog