High Sensitivity Water Level Sensor | ATMOSFÆR ENGINEERING

Water Level Sensor Module

Cost-effective analog water level detection sensor utilizing 10 exposed parallel copper wire traces (5 power, 5 sense) to measure water presence and depth. Converts water quantity to analog signal output (0-3.85V range), compatible with Arduino, ESP32, and other microcontrollers. Ideal for water level monitoring, leak detection, overflow alarm systems, rain detection, and irrigation automation.

Technical Specifications:

• Working Voltage: 3V - 5V DC (recommended: use ≤5V to minimize electrolysis)
• Working Current: <20mA
• Sensor Type: Analog output
• Output Voltage Range: 0V to 3.85V (proportional to water depth)
• Detection Area: 40mm (height) x 16mm (width)
• Signal Output: Analog voltage (0-1023 ADC value on Arduino)
• PCB Material: FR4 double-sided with tin plating, copper traces
• Internal Circuit: NPN transistor switching with current-limiting resistors
• Pull-up Resistor: 1MΩ (weak pull-up on sense traces)
• Working Temperature: 10°C to 30°C (some variants: -30°C to 50°C)
• Working Humidity: 10% - 90% (non-condensing)
• Dimensions: 62mm x 20mm x 8mm
• Weight: 3.5g - 5g

Pin Configuration:

• VCC/+ : Power supply (3.3V-5V)
• GND/- : Ground
• S/OUT/AO : Analog signal output

Important Usage Notes:

• Do not submerge electronics - only immerse the sensor traces area (below "Water Sensor" label)
• Intermittent power recommended - connect VCC to digital GPIO pin instead of constant 5V to dramatically reduce electrolysis corrosion and extend sensor lifespan
• Calibration required - output voltage varies with water conductivity; calibrate at known depths for accuracy
• Orientation matters - mount with parallel traces perpendicular to water surface for level detection; horizontal for rain detection
• Works with conductive water - tap water conducts well due to minerals; pure H2O is non-conductive

Compatible with Arduino, ESP32, Raspberry Pi, and other microcontrollers with analog input capabilities.