--- product_id: 171885565 title: "CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc." brand: "cqrobot" price: "R771" currency: ZAR in_stock: true reviews_count: 13 category: "Cq Robot" url: https://www.desertcart.co.za/products/171885565-cqrobot-non-contact-water-liquid-level-sensor-compatible-with-arduino store_origin: ZA region: South Africa --- # 500ms fast response time 13mm sensing distance 3.3V/5V dual voltage output CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. **Brand:** cqrobot **Price:** R771 **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead with smart, non-contact liquid sensing—because your projects deserve precision and speed! ## Quick Answers - **What is this?** CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. by cqrobot - **How much does it cost?** R771 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/171885565-cqrobot-non-contact-water-liquid-level-sensor-compatible-with-arduino) ## Best For - cqrobot enthusiasts ## Why This Product - Trusted cqrobot brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Plug-and-Play Installation:** Simple setup with DIP switches and flexible sensor pad—get your project running straight out of the box. - • **Precision Non-Contact Sensing:** Detect liquid levels through plastic, glass, and ceramics up to 13mm away—no direct contact needed. - • **Flexible Voltage Compatibility:** Seamlessly integrates with Arduino, Raspberry Pi, and other boards via selectable 3.3V or 5V output. - • **Robust Industrial-Grade Design:** Handles toxic chemicals, strong acids, and alkalis safely in high-pressure, airtight containers. - • **Rapid Response for Real-Time Control:** Half-second detection speed ensures your automated systems react instantly to liquid changes. ## Overview The CQRobot Non-Contact Water/Liquid Level Sensor offers high-sensitivity, interference-resistant detection of liquid levels through non-metallic container walls up to 13mm thick. Compatible with popular microcontrollers like Arduino and Raspberry Pi, it supports dual voltage outputs (3.3V/5V) and delivers rapid 500ms response times. Designed for industrial, agricultural, and aquarium applications, it safely detects a wide range of liquids including corrosive chemicals, making it a versatile and reliable choice for automated liquid level monitoring. ## Description Product Description - Cable Specifications: 22AWG - Material: Silicone - Length: 21cm - Withstand Voltage: Less Than 50V - Withstand Current: Less Than 1000MA - Line Sequence: Black-Negative Power Supply, Red-Positive Power Supply, Green-Signal. Note: For more information, please refer to CQRobot Wiki to obtain the test code, SKU: CQRSENYW001 . Review: Works very well - Bought for an Arduino project. Monitors a barrel and triggers a pump when level rises and of when drops. Was very pleasantly surprised by the operation of the sensor. Worked straight from the box. Review: Worked as expected - I received this water level detector for free through desertcart Vine in exchange for an honest and unbiased review. This is a PCB with a water level sensor designed for use in embedded projects. The PCB has two switches that are not well documented: one switches the signal line between active-high and active-low, and the other allows the board to be powered at either 3.3 V or 5 V. It’s very basic — you either get a signal when water is present or you don’t. On the detection module there is a tiny adjustment screw, and after a few minor tweaks I was able to detect the water level in my plastic water jug. It won’t activate on metal, and if you touch it, it will trigger on your finger. A red LED on the detector shows when it has detected water, which is helpful during setup. Ideally, the detector pad needs to make contact with the side of whatever you are detecting. The pad is flexible and can be glued or zip-tied in place. The signal wire would typically be connected to a GPIO pin on an embedded device, but when powered at 3.3 V I found that this line only reached about 2 V. This is probably acceptable for most applications, but it should be considered when designing something that uses this detector. That said, it works well through glass or plastic and was perfect for measuring how much water is in my water butts in the garden. ## Features - The CQRobot non-contact liquid level sensor realizes non-contact detection of the liquid level in a closed container. It adopts advanced signal processing technology and high-speed signal processing chip, breaking through the influence of container wall thickness. It is simple to install and easy to use, and can detect the level of various toxic substances, strong acids, strong alkalis and various liquids in high-pressure airtight containers. - The principle is to use the inductive capacitance of water to detect whether there is liquid. When there is no liquid close to the sensor, the sensor has a certain static capacitance to the ground due to the existence of distributed capacitance on the sensor. When the liquid level slowly rises and approaches In the case of an inductor, the parasitic capacitance of the liquid will be coupled to this static capacitance, making the final capacitance value of the inductor larger. - The changed capacitance signal is then input to the control IC for signal conversion, which converts the changed capacitance into a change of a certain electrical signal, and then a certain algorithm is used to detect and judge the degree of this change. When the change exceeds a certain amount It is considered that the liquid level has reached the sensing point when the threshold is reached. - High stability, high sensitivity, strong interference ability, no external electromagnetic interference, special treatment for power frequency interference and common mode interference, strong compatibility, penetration of various non-metallic containers, such as plastic, glass, For ceramics and other containers, the sensing distance can reach more than 12mm; liquid, powder, and particulate matter can be detected. - The sensor comes with 2 DIP switches, the right DIP switch controls the output voltage (high level) of the signal terminal (green line); when the DIP switch is dialed up, the high level is 5V; when the DIP switch is facing When dialing down, the high level is 3.3V. Compatible with Arduino, Raspberry Pi and Other Motherboards. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B07ZMHJ6NN | | Best Sellers Rank | 42,015 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 41 in Liquid Level Sensors | | Brand | CQRobot | | Country Of Origin | China | | Current Rating | 50 Milliamps | | Current rating | 50 Milliamps | | Customer Reviews | 4.0 out of 5 stars 389 Reviews | | Item Weight | 0.05 Kilograms | | Item weight | 0.05 Kilograms | | Manufacturer | CQRobot | | Manufacturer Part Number | CQRSENYW001 | | Material | Acrylonitrile Butadiene Styrene | | Maximum Supply Voltage | 5 Volts (DC) | | Maximum supply voltage | 5 Volts (DC) | | Model Number | CQRSENYW001 | | Mounting Type | Surface Mount | | Output Type | Electric | | Response Time | 500 Milliseconds | | Sensing Distance | 13 Millimetres | | Specific Uses For Product | Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening | | Style | Non-Contact Type-1 | | Style Name | Non-Contact Type-1 | | Upper Temperature Rating | 105 Degrees Celsius | ## Product Details - **Brand:** CQRobot - **Current rating:** 50 Milliamps - **Item weight:** 0.05 Kilograms - **Material:** Acrylonitrile Butadiene Styrene - **Style:** Non-Contact Type-1 ## Images ![CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. - Image 1](https://m.media-amazon.com/images/I/61jpk8-rfmL.jpg) ![CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. - Image 2](https://m.media-amazon.com/images/I/81rR-K5AtpL.jpg) ![CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. - Image 3](https://m.media-amazon.com/images/I/81Flqo3aXRL.jpg) ![CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. - Image 4](https://m.media-amazon.com/images/I/71lHPeVzQyL.jpg) ![CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. - Image 5](https://m.media-amazon.com/images/I/71-Mth4GBPL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: To clarify, the theoretical dialectic capacitance of distilled water is 0.348 nF. The air gap dialectic capacitance of the electrode is unknown?** A: Hello! Regarding the "electrode air gap dialectical capacitance" you mentioned, it is not included in our product production technical indicators, so we are very sorry that we cannot answer this question for you. **Q: Will it read through black plastic waist water tank on trailer** A: Hi! It can read through the outer wall of non-metallic containers with a thickness of less than 13 mm. If the wall thickness of the black plastic waste tank on your trailer exceeds 13 mm, it is likely to be unreadable. The following is the Wiki of this product for reference: http://www.cqrobot.wiki/index.php/Non-Contact_Water/Liquid_Level_Sensor_SKU:_CQRSENYW001 **Q: Will this work on the outside of a curved 15 gallon hdpe water reservoir? i have some of thhe optical sensor but want to switch containers.** A: Hello! Just make sure that its outer wall meets the requirements for use. You can refer to the following wiki for this product: http://www.cqrobot.wiki/index.php/Non-Contact_Water/Liquid_Level_Sensor_SKU:_CQRSENYW001 **Q: Can I extend the wires? Is it better to lengthen wires between sensor cb and rPi or sensor cb and sensor?** A: Hello! If you need to extend the wire, it is recommended to lengthen the wire between the sensor cb and RPi so that the sensing sensitivity of the sensor is not affected too much. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Works very well *by S***S on 2 July 2020* Bought for an Arduino project. Monitors a barrel and triggers a pump when level rises and of when drops. Was very pleasantly surprised by the operation of the sensor. Worked straight from the box. ### ⭐⭐⭐⭐⭐ Worked as expected *by J***N on 11 January 2026* I received this water level detector for free through Amazon Vine in exchange for an honest and unbiased review. This is a PCB with a water level sensor designed for use in embedded projects. The PCB has two switches that are not well documented: one switches the signal line between active-high and active-low, and the other allows the board to be powered at either 3.3 V or 5 V. It’s very basic — you either get a signal when water is present or you don’t. On the detection module there is a tiny adjustment screw, and after a few minor tweaks I was able to detect the water level in my plastic water jug. It won’t activate on metal, and if you touch it, it will trigger on your finger. A red LED on the detector shows when it has detected water, which is helpful during setup. Ideally, the detector pad needs to make contact with the side of whatever you are detecting. The pad is flexible and can be glued or zip-tied in place. The signal wire would typically be connected to a GPIO pin on an embedded device, but when powered at 3.3 V I found that this line only reached about 2 V. This is probably acceptable for most applications, but it should be considered when designing something that uses this detector. That said, it works well through glass or plastic and was perfect for measuring how much water is in my water butts in the garden. ### ⭐⭐⭐⭐ Good simple non contact sensor *by M***K on 17 November 2025* This is one of 3 non contact water detection devices by CQRobot that are electrically identical and differ only in the surface to which they are to be attached. This is the one intended for curved surfaces or pipes greater than 10mm in diameter. The sensor itself is pictured and requires a cable tie or similar (not supplied) to secure it to the pipe. A velcro tie supplied with the sensor to tidy the wires is unfortunately to wide to be repurposed. Other than that the device is excellent and makes implementing a trigger on absence/presence of water simple. I tested using a plastic water jug. The circuit board has a dip switch to select 5v or 3.3v compatibility and another to invert the output. Output is binary, 0v or high and doesn't float. For 3.3v input high is approx 2v, for 5v approx 4.3v. Rise/fall is smooth and doesn't require debounce although it might be wise to allow for air bubbles in the flow if rapid switching would be adverse for the application. Disappointingly none of this has any moisture protection. The video shows the electrical output on an oscilloscope when triggered. The device pulls about 3mA regardless of trigger state, sensitivity setting or input voltage. This is about as simple as attaching a device to your electronics project gets needing only physical installation, setting jumpers and connection for pwr, gnd, signal to pin then reading pin state. My only criticism would be the lack of moisture protection which if included would have made this perfect. ## Frequently Bought Together - CQRobot Non-Contact Water/Liquid Level Sensor Compatible with Arduino, Raspberry Pi and Other Motherboards. for Industrial Production, Aquarium, Chemical Solution, Agriculture, Gardening, etc. - Arduino Uno REV3 [A000066] – ATmega328P Microcontroller, 16MHz, 14 Digital I/O Pins, 6 Analog Inputs, 32KB Flash, USB Connectivity, Compatible with Arduino IDE for DIY Projects and Prototyping - ELEGOO 120pcs Multicolored Dupont Wire 40pin Male to Female, 40pin Male to Male, 40pin Female to Female Breadboard Jumper Ribbon Cables Kit Compatible with Arduino Projects --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.za/products/171885565-cqrobot-non-contact-water-liquid-level-sensor-compatible-with-arduino](https://www.desertcart.co.za/products/171885565-cqrobot-non-contact-water-liquid-level-sensor-compatible-with-arduino) --- *Product available on Desertcart South Africa* *Store origin: ZA* *Last updated: 2026-06-21*