Water Level Sensor
Interleaved traces whose reading rises with how deep the water is.
How it works
A water level sensor has a set of interlocking conductive traces. Water bridges them and lowers the resistance, so the analog output climbs as the water rises — useful for tank levels, rain, and leak detection.
The exposed traces corrode if left powered in water, so a good trick is to power the sensor from a digital pin and only turn it on for the moment you take a reading.
Pins
- + (VCC)
- Power — often driven from a digital pin.
- − (GND)
- To GND.
- S (signal)
- Analog output — to an analog pin.
Ratings
- Voltage
- 3.3–5 V
- Output
- Analog (rises with water)
Tips
- Power it from a GPIO and switch it on only to read — greatly reduces corrosion.
- Calibrate dry vs. submerged to pick a threshold.