{"product_id":"capacitive-non-contact-water-level-sensor-liquid-detector-3v-5v","title":"Non-Contact Capacitive Water Level Sensor 3.3V–5V | Liquid Detector","description":"\n\u003ch2\u003eCapacitive Non-Contact Water Level Sensor — Smart Liquid Detection Made Simple\u003c\/h2\u003e\n\u003cp\u003eMonitor liquid levels without ever touching the liquid. This compact \u003cstrong\u003ecapacitive water level sensor\u003c\/strong\u003e attaches to the outside of any plastic tank or container and detects whether it is full or empty — no drilling, no sealing, no corrosion. Running on just 3.3V–5V, it's the perfect addition to hand sanitizer dispensers, water coolers, aroma diffusers, DIY electronics projects, and more.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eNon-contact detection\u003c\/strong\u003e — mounts flush against the outside wall of a plastic container; liquid never touches the sensor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide voltage support\u003c\/strong\u003e — operates on 3.3V to 5V, compatible with Arduino, Raspberry Pi, and most microcontroller boards\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual alert function\u003c\/strong\u003e — provides both a low-water (water shortage) signal and a full-water reminder\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor-coded wiring\u003c\/strong\u003e — Red = positive, Black = negative, Yellow = signal; quick and error-free connections\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSheathed wire construction\u003c\/strong\u003e — durable, flexible cable for reliable long-term installations\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDry-environment design\u003c\/strong\u003e — ideal for indoor use; keep away from high temperatures and moisture on the sensor body\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; lightweight\u003c\/strong\u003e — easy to position and secure with minimal space required\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3.3V – 5V DC\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDetection Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCapacitive (non-contact)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWire Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eSheathed wire (Red \/ Black \/ Yellow)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCompatible Tanks\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic (non-metallic) containers\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eApplication\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eHand sanitizer machines, water dispensers, aroma diffusers, DIY electronics\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eIncompatible Liquids\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePure alcohol, gasoline (cannot detect)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 × Capacitive Liquid Level Sensor\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eCompatible Use Cases\u003c\/h3\u003e\n\u003cp\u003eThis sensor is well-suited for makers, hobbyists, and product developers working with:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eArduino \u0026amp; Raspberry Pi water-level monitoring projects\u003c\/li\u003e\n  \u003cli\u003eAutomated hand sanitizer or soap dispenser refill alerts\u003c\/li\u003e\n  \u003cli\u003eAroma diffuser and humidifier low-water warnings\u003c\/li\u003e\n  \u003cli\u003eWater cooler and countertop dispenser level control\u003c\/li\u003e\n  \u003cli\u003eCustom IoT home automation systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eSensor must be used in close contact with the outer wall of a \u003cstrong\u003eplastic\u003c\/strong\u003e water tank — it cannot detect through metal.\u003c\/li\u003e\n  \u003cli\u003eNot suitable for detecting pure alcohol or gasoline.\u003c\/li\u003e\n  \u003cli\u003eUse in a dry environment and avoid high-temperature conditions.\u003c\/li\u003e\n  \u003cli\u003eManual measurement tolerance: ±1–3 mm. Color may vary slightly from images due to screen settings.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eExplore our \u003ca href=\"\/products\/1-percent-better-every-day-motivational-canvas-wall-poster-inspirational-quote\"\u003e\"1% Better Every Day\" Motivational Canvas Poster\u003c\/a\u003e for your workspace.\u003c\/li\u003e\n  \u003cli\u003eCheck out our \u003ca href=\"\/products\/best-seat-in-the-house-retro-quote-canvas-wall-art-print\"\u003e\"Best Seat In The House\" Retro Quote Canvas Wall Art\u003c\/a\u003e for home décor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eFor more guidance on safe electronics and sensor use in DIY projects, visit the U.S. Consumer Product Safety Commission (CPSC) for general electrical product safety resources.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Can this capacitive water level sensor detect liquid through any container material?\u003c\/h4\u003e\n\u003cp\u003eA: No — the sensor is designed to work through \u003cstrong\u003eplastic (non-metallic) container walls\u003c\/strong\u003e only. It cannot detect liquid through metal tanks or walls. For best results, press it flush against the outside of a thin plastic tank.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Is this sensor compatible with Arduino and Raspberry Pi boards?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The sensor operates on 3.3V–5V DC, making it fully compatible with Arduino, Raspberry Pi, ESP32, and most other popular microcontroller platforms. Simply connect the red wire to power, black to ground, and yellow to your signal\/input pin.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What liquids can this sensor detect?\u003c\/h4\u003e\n\u003cp\u003eA: The capacitive liquid level sensor reliably detects water and most water-based liquids (such as liquid soap, diffuser water, and similar solutions). It \u003cstrong\u003ecannot\u003c\/strong\u003e detect pure alcohol or gasoline due to their low dielectric constants.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I install the sensor on my tank?\u003c\/h4\u003e\n\u003cp\u003eA: Clean and dry the outer wall of your plastic tank at the desired level. Position the sensor flat against the wall and secure it with tape or an adhesive mount. Connect the color-coded wires to your controller board, and the sensor will detect whether liquid is present at that point — no drilling or sealing required.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Can this capacitive water level sensor detect liquid through any container material?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"No — the sensor is designed to work through plastic (non-metallic) container walls only. 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