Non-Contact Capacitive Water Level Sensor 3.3V–5V | DIY

Capacitive Non-Contact Water Level Sensor — Smart Liquid Detection for Home & DIY Projects

The Nixie Capacitive Liquid Level Sensor lets you monitor water or liquid levels without any contact with the fluid. Simply mount it on the outside of a plastic water tank or container and it detects the liquid level through the wall — no drilling, no sealing, no leaks. Perfect for DIY electronics, water dispensers, aroma diffusers, hand-washing machines, and more.

Made in Mainland China.

Key Features

• Non-Contact Detection: Senses liquid levels through plastic container walls — no direct fluid contact required.
• Wide Voltage Compatibility: Works with 3.3V–5V power supplies, making it compatible with Arduino, Raspberry Pi, and most microcontrollers.
• Dual Alert Function: Configurable for both low-water (shortage) and full-water reminders.
• Simple 3-Wire Connection: Red = positive (+), Black = negative (−), Yellow = signal output — easy to wire up in minutes.
• Sheathed Wire: Durable, insulated wiring for reliable and safe connections.
• Compact Plastic Body: Lightweight and easy to position on curved or flat tank surfaces.

Specifications

Important Usage Notes

• Must be used in close contact with the outside of a plastic water tank. Does not work through metal or glass.
• Cannot detect pure alcohol or gasoline/petroleum-based liquids.
• Use in a dry environment — keep the sensor itself away from moisture.
• Avoid high-temperature environments — not suitable for use near heat sources.

Great For

• Water dispensers & drinking water stations
• Aroma diffusers & humidifiers
• Automatic hand-washing machines
• Arduino & Raspberry Pi DIY projects
• Smart home automation systems
• Aquariums & irrigation controllers

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Learn more: OSHA on personal protective equipment

Frequently Asked Questions

Q: What types of containers does the capacitive liquid level sensor work with?

A: This capacitive water level sensor is designed to work through the walls of plastic containers and tanks. It must be placed flat against the outside surface of the plastic tank. It is not compatible with metal, glass, or ceramic containers, as these materials block the capacitive sensing signal.

Q: Can I use this sensor with an Arduino or Raspberry Pi?

A: Yes! The sensor operates on 3.3V to 5V DC, which is perfectly compatible with Arduino, Raspberry Pi, ESP8266, ESP32, and most other popular microcontroller boards. Simply connect the red wire to power, black wire to ground, and yellow wire to a digital input pin to read the signal.

Q: Does this sensor work with liquids other than water?

A: The sensor works with most common water-based liquids. However, it cannot detect pure alcohol or gasoline/petroleum-based liquids. For best results, use it with water, juice, or similar non-volatile, water-based fluids in a plastic container.

Q: How do I install the non-contact water level sensor?

A: Installation is straightforward — clean the outside surface of your plastic tank and press the sensor flat against it at the desired water level position. You can secure it with double-sided tape or a mounting bracket. No drilling or holes are needed, keeping your container completely sealed.

Production & Packaging Notice

To maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.