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Water Level Sensor

Sensor

Level sensor whose parallel conductive tracks give an analog output that changes with how deep it sits in water. Used in flood alarm and tank level monitoring projects.

Specifications

Supply voltage

3 - 5V DC

Operating current

< 20 mA

Output

Analog

Sensing area

40 x 16 mm

Operating temperature

10 - 30 °C

Pins

S (signal), +, −

Shop prices

• RobotistanIn stock13.10 ₺
• RobotzadeIn stock13.80 ₺
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• F1 DepoIn stock15.00 ₺
• ElektrovadiIn stock15.03 ₺
• Robo90In stock15.48 ₺
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• MotorobitIn stock20.20 ₺
• SAMM MarketIn stock20.84 ₺
• Entegre DünyasıIn stock89.42 ₺
• RobitshopIn stockPrice at the shop

Prices read from the shops' pages on 22 October 2026. Prices and stock may have changed since; check at the shop before you buy.

Projects with this part

• Level Measurement with a Water Level SensorBeginner15 minA starter project that reads the water level sensor's analog output and writes the level as Empty, Low, Medium or High to the Serial Monitor once a second. As the sensor's parallel tracks go under water, the resistance drops and the reading rises. The thresholds (100, 400, 450) depend on the water's conductivity and the sensor; watching the raw values first and setting your own thresholds gives better results. Only dip the lower part with the tracks in water; keep the electronics and pins at the top dry. To reduce corrosion, do not leave the sensor powered all the time. No extra library needed.Open project