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💧 Stay ahead with smart, non-contact liquid sensing—because your projects deserve precision and speed!
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.










| 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 |
S**S
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.
J**N
Worked as expected
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.
M**K
Good simple non contact sensor
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.
V**I
Very easy to set up
This water level detector works great and it is very simple to setup. It features a very basic operation of on or off. This is great for controlling the set liquid level sensing weather for pump control or water level alarm systems. I have been using this with my raspberry pi 4 using home assistant to measure my rain water collection tanks and it was very easy to setup and use. This is a great quality sensor and perfect for any project needing water level automation. And for the price it's really excellent value for money to. I highly recommended it, thanks so much.
G**N
Works, but doesn't match photographs
It doesn't have the adjustment screw shown in the photographs, which is the only reason I purchased this one in the particular. It works, is easy to setup, and the sample code is helpful, hence giving it two stars. But I'm using it in a very humid environment (poison dart frog terrarium) so am getting lots of false positives. It thinks the condensation is the water level. This is why I needed one with a sensitivity adjustment. I have found that if I put spacer between the device and the glass it does the same thing as the screw would, but making a spacer the right size to compensate for the humidity is going to be a lot more effort than being able to adjust with a screw. It's just false advertising. I didn't get what I paid for.
D**N
Works well
This non-contact liquid level sensor from CQRobot has been fantastic. I used it with Arduino for a few small projects and it works exactly as described. Setup was straightforward and it paired with my boards without any headaches. The non-contact detection makes it great for all kinds of liquids — no corrosion, no sticking — and it reads consistently in the 3–10 mm range I needed. In my use it’s been stable and accurate whether near water in an aquarium test or checking reservoirs in a small automated system. Build quality feels solid and it’s responsive without false triggers. If you’re doing DIY electronics involving liquid monitoring — especially with microcontrollers — this is a dependable sensor that’s worth the price.
H**R
Worked very well until the water touched the pins, this water-tool is not waterproof !
Despite various mixed reviews saying all sorts of things, I actually liked this product, installed to monitor a pipe and using my own way of reading the analog pins and working out the feedback I could tell if there is water or not, and get an idea of how deep it is, all this is fine, until the water touches the unit and then all goes wrong. I don't get how this is a water level check whilst is not water-proof, it works inside the tank but not behind the glass unfortunately. So, I personally have my own mixed reviews myself using this product.
A**R
Reliable non-contact liquid detection, but expensive and lacks printed instructions
💧 The box contains a single capacitive non-contact liquid level sensor with a short connector lead. The module is compact, clearly laid out, and arrives well protected. There is no printed documentation included, so I relied on the markings on the PCB and the product listing to confirm pin-out and switch positions. 💧 This sensor detects the presence of liquid at a fixed point and nothing more. It behaves like a simple on or off switch, triggering when liquid reaches the height where it is mounted. It does not report a graduated level, so monitoring multiple levels would require several sensors. In my case, I am using it to detect when a container is effectively empty, which suits this type of device well. 💧 Power and logic flexibility are handled by two small DIP switches on the board. One selects 3.3V or 5V operation, and the other inverts the output logic. I used it at 3.3V with an ESP32 without issue, and the single GPIO output keeps the wiring and code simple. Integration with ESPHome and Home Assistant was straightforward as the signal is just high or low. 💧 The sensor works on non-metallic containers such as plastic provided the wall thickness stays within the stated limits. It does not function on metal tanks. One of its main strengths is that it mounts externally and never contacts the liquid, which avoids corrosion and fouling. It is not waterproof, so outdoor use would require a protective housing, and thick garden water containers may push the limits of detection. 💧 With no moving parts, it should be suitable for continuous use, and so far it has behaved consistently. Long-term durability remains to be seen. At £15.99, it performs its job well and integrates cleanly with common microcontrollers, but for a single-point detection sensor it does feel expensive. It makes sense where non-contact sensing matters, though it is not a low-cost component. ✔️
E**O
Sensor de nivel de agua sin contacto directo
Sensor de nivel de líquido sin necesidad de contacto directo con el líquido. La ventaja que tienen este tipo de sensores por una parte es que no sufren la corrosión ni la acumulación de cal que tienen los que están en contacto directo con los líquidos. Este sensor una de las utilidades que tiene es determinar cuando el nivel de líquido de un tanque alcanza un cierto nivel. Puede usarse para calcular la lluvia acumulada o para avisarnos de cuando debemos rellenar un depósito de agua para riego de plantas o avisarnos de cuando debemos vaciar la cubeta en la que recogemos el agua del aire acondicionado. Os recomiendo ponerlo en una caja estanca, quedando solo el sensor fuera y dejando dentro el arduino, raspberry, esp32 o el microcontrolador que uses. Por uno de los huecos puedes sacar un alimentador o instalar un usb en la caja para recargar la batería, en caso de querer usarlo así.
J**Y
Instable!!!
Le capteur à été utilisé avec un mcu pour contrôler le niveau de remplissage d’eau d’un réservoir d’un système et le vidanger lorsqu’il est plein. Le problème est que lorsqu’une goutte d’eau éclabousse au hasard la lentille du capteur, ce dernier s’active alors de manière erronée tant et aussi longtemps que la goutte persiste sur cette dernière. Dans ma situation, cela occasionnait une vidange erronée du réservoir. J’ai dû opter pour un autre type de capteur (capacitif) afin de palier à la situation…
T**O
Le top pour les capteurs d'eau
Ces capteurs fonctionne hyper bien il me permettent de remplir et de contrôler le niveau d'un réservoir avec un Arduino
F**A
Perfecto para profesionales y un lujo para profesores, sensor de alta calidad y sensibilidad...
Complemento para Arduino o Raspberry de alta calidad, bien protegido y fabricado con esmero, este sensor permite comprobar el nivel en un depósito sin entrar en contacto con el líquido, ideal para aplicaciones industriales, un lujo para tener en clase… PRESENTACIÓN: Viene en una pequeña cajita, protegido con una bolsita sellada anti-UV, lo que garantiza que lo recibamos en buenas condiciones. No trae ningún tipo de manual, aunque en la web del fabricante disponen de una página exclusiva para este set, con una explicación exhaustiva del montaje, con ejemplos de posicionamiento, esquema de pruebas e incluso códigos de ejemplo, tanto para Arduino como Raspberry: _ Sensor de nivel de líquido sin contacto, adecuado para instalar en las paredes externas de recipientes, depósitos o tanques, sin contacto directo con líquido, sin corrosión, sin deterioro por ácidos y álcalis, libre de incrustaciones u otros desechos. _ La sonda tiene un diámetro de 28 mm., la placa es de 30 x 30 mm, el cable entre sonda y placa mide 48 cm. y por el otro lado el cable a la micro-controladora mide 30 cm. _ La sonda puede detectar el nivel de agua hirviendo, ya que soporta trabajar hasta 105 °C, y tiene un acabado IP67, lo que permite trabajar a la intemperie… _ Tratamiento especial para interferencias y campos electromagnéticos… _ Especial para contenedores NO METÁLICOS, como plástico, vidrio, cerámica, etc… _ La distancia de detección puede alcanzar 12 mm _ Tiene un interruptor para seleccionar el voltaje de entrada, entre 3 y 5 V. _ Tiene un interruptor para seleccionar el modo de funcionamiento, abierto o cerrado. Pensado especialmente para aplicaciones industriales, este es un dispositivo listo para su uso. Simplemente hay que conectarlo a una placa de Arduino o Raspberry según el esquema indicado en la web del fabricante. Un lujo para tener en Institutos y Escuelas para aulas de robótica, electrónica y mecánica de fluidos. Nosotros hemos realizado la prueba con una placa Arduino UNO cargada con el código fuente del fabricante, una jarra de cristal de 6 mm. de grosor y ha detectado perfectamente cuando el nivel a llegado al módulo de tres líquidos diferentes, agua, aceite y gaseosa con muchas burbujas… Ha sido muy interesante… En resumen, si buscas una sonda de nivel de líquidos, especial para usar por el exterior del contenedor, esta es una de las mejores opciones, muy bien fabricado, con la información necesaria en la web del fabricante… Ideal para aplicaciones industriales, comerciales y sobre todo para uso educativo en Secundaria o Formación Profesional… Saludos!!!
F**A
Sorprendentemente precisa, se puede instalar en cualquier posición, un lujo...
Complemento para Arduino o Raspberry de alta calidad, bien protegido y fabricado con esmero, este sensor permite comprobar que un líquido llega a un determinado nivel por medio de un sistema fotoeléctrico de alta precisión… PRESENTACIÓN: Viene en una pequeña cajita, protegido con una bolsita sellada anti-UV, lo que garantiza que lo recibamos en buenas condiciones. No trae ningún tipo de manual, aunque en la web del fabricante disponen de una página exclusiva para este set, con una explicación exhaustiva del montaje, con ejemplos de posicionamiento, esquema de pruebas e incluso códigos de ejemplo, tanto para Arduino como Raspberry: _ Sensor de nivel por contacto, con una estructura de diodo emisor incorporado y fototransistor, encapsulados, haciendo que no entren en contacto directo con el líquido. _ La sonda tiene un diámetro de 20 mm., tiene un encapsulado de plástico, goma de estanqueidad y un sistema de rosca y tuerca para sujetarla a la pared del recipiente. _ La placa es de 30 x 30 mm, el cable entre sonda y placa mide 48 cm. y por el otro lado el cable a la micro-controladora mide 30 cm. _ La sonda puede detectar líquidos calientes hasta un límite de 105 °C. _ Tratamiento especial para interferencias y campos electromagnéticos… _ Tiene un interruptor para seleccionar el voltaje de entrada, entre 3 y 5 V. _ Se puede instalar en cualquier posición, horizontal, vertical, diagonal, cabeza abajo… Pensado especialmente para aplicaciones industriales, este es un dispositivo listo para su uso. Simplemente hay que conectarlo a una placa de Arduino o Raspberry según el esquema indicado en la web del fabricante. Un lujo para tener en Institutos y Escuelas para aulas de robótica, electrónica y mecánica de fluidos. Nosotros hemos realizado la prueba con una placa Arduino UNO cargada con el código fuente del fabricante, varios vasos de cristal, plástico y metal, con líquidos diversos como agua, aceite, gaseosa, agua hirviendo y chocolate caliente muy espeso… Ha detectado todos los niveles con precisión así que tocaban la punta de la sonda, a destacar que no le afectó el vapor del agua hirviendo ni la densidad el chocolate… Perfecto… En resumen, si buscas una sonda de nivel de líquidos de calidad superior, con detección óptica y lista para conectar a un micro-controlador, esta es la opción de lujo, con calibración y sensibilidad garantizadas y una estética fácil de usar… Ideal para profesionales… Saludos!!!
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