// Goes with it

Complete the build

The parts this one is wired with in our kits — have them on the bench before you start.

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// Where this part goes

Used in these kits and projects

All projects →

Kit ESP32 Plant Monitoring Learning Kit 7 parts · 7 projects →

// 01

Description

The Water Level Sensor Module is a simple and effective liquid detection board designed for Arduino and common microcontroller projects. It uses exposed conductive sensing tracks to detect the presence and relative level of water (and other conductive liquids). As the liquid rises and covers more of the sensing area, the module outputs a higher analog signal—making it easy to estimate water level or trigger leak detection alerts.

This sensor is widely used in DIY systems such as water tank monitoring, hydroponics reservoirs, pump automation, overflow protection, and leak alarms. Because it outputs an analog voltage, you can set custom thresholds in code to decide when to turn a pump on/off, sound a buzzer, or send a notification.

How It Works

The sensor has parallel copper traces that act like electrodes. When water touches the traces, it creates a conductive path. The more area that is covered, the stronger the sensed conductivity, producing a proportional analog output that your microcontroller can read using an ADC pin.

Key Features & Benefits

Analog Level Sensing: Provides a variable output for approximate level measurement (not just ON/OFF)
Wide Voltage Range: Works from 3V to 5V DC for common boards
Fast Response: Detects water contact quickly for leak/overflow alarms
Simple Wiring: 3-pin interface (Signal, VCC, GND)
Compact & Breadboard-Friendly: Easy to integrate into prototypes and enclosures
Flexible Use: Suitable for tanks, trays, reservoirs, and pipelines (with proper mounting)

Wiring / Pinout (Typical)

Pin	Meaning	Connect To
S	Signal (Analog Out)	Arduino/ESP32 ADC pin
+	VCC	3V–5V
-	GND	Ground

Typical Specifications

Item	Details
Sensor Type	Conductive water level / leak sensor
Operating Voltage	3V–5V DC
Output Type	Analog output (voltage varies with level/contact)
Interface	3-pin (S, +, -)
Detects	Water and other conductive liquids
Use Cases	Tank level, hydroponics, leak alarm, pump control

Notes:

This sensor is best for water/leak detection and approximate level sensing, not precision measurement.
Long exposure to water (especially mineral/dirty water) can cause corrosion on copper traces. For longer life, use it intermittently, keep it clean, or consider a corrosion-resistant probe style sensor.

Example Applications

Water tank level indicator (low/medium/high thresholds)
Hydroponics reservoir monitoring
Sump pump/overflow protection
Leak detection under sinks or near AC drain lines
Automatic pump control using a relay module

// 02

Specifications

Measures Water level/depth (contact)

Output Analog

Supply Voltage 3-5 V

Use Leak alarm, tank level

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// From Sensors