---
product_id: 171885566
title: "CQRobot Contact Water/Liquid Level Sensor Compatible with Raspberry Pi/Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in the Garden, in Agriculture etc."
brand: "cqrobot"
price: "R527"
currency: ZAR
in_stock: true
reviews_count: 8
category: "Cq Robot"
url: https://www.desertcart.co.za/products/171885566-cqrobot-contact-water-liquid-level-sensor-compatible-with-raspberry-pi
store_origin: ZA
region: South Africa
---

# Ultra-low 12mA power draw ±0.5mm precision sensing Flexible multi-orientation mount CQRobot Contact Water/Liquid Level Sensor Compatible with Raspberry Pi/Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in the Garden, in Agriculture etc.

**Brand:** cqrobot
**Price:** R527
**Availability:** ✅ In Stock

## Summary

> 💧 Stay ahead of the curve with pinpoint water sensing—because your smart garden deserves the best!

## Quick Answers

- **What is this?** CQRobot Contact Water/Liquid Level Sensor Compatible with Raspberry Pi/Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in the Garden, in Agriculture etc. by cqrobot
- **How much does it cost?** R527 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/171885566-cqrobot-contact-water-liquid-level-sensor-compatible-with-raspberry-pi)

## 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

- • **Power-Savvy Design:** Consumes just 12mA, perfect for energy-conscious smart setups.
- • **Versatile Mounting:** Install it up, down, sideways, or diagonally—fits any project layout.
- • **Plug & Play Compatibility:** Seamlessly integrates with Raspberry Pi & Arduino for instant smart control.
- • **Corrosion & Heat Resistant:** Built to last with chemical stability and up to 105°C tolerance.
- • **Precision Liquid Detection:** Detects water presence with ±0.5mm accuracy for flawless automation.

## Overview

The CQRobot Contact Water/Liquid Level Sensor is a compact, photoelectric sensor designed for precise, non-contact water level detection with ±0.5mm accuracy. Operating at ultra-low power (12mA) and supporting both 3.3V and 5V logic levels, it offers flexible mounting orientations and robust resistance to corrosion, heat (up to 105°C), and chemicals. Compatible with Raspberry Pi and Arduino platforms, it’s ideal for smart irrigation, aquariums, and agricultural automation, delivering reliable, maintenance-free liquid level monitoring.

## Description

CQRobot Contact Water/Liquid Level Sensor Compatible with Raspberry Pi/Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in the Garden, in Agriculture etc. : desertcart.co.uk: Business, Industry & Science

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.
Review: 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. ✔️

## Features

- Contact Water/Liquid Level Sensor, This is a photoelectric water liquid level sensor that is operates using optical principles. Open collector output mode, suitable for connecting various circuits and product applications.
- The sensor has no mechanical parts, requires no additional adjustment, and has high sensitivity, low power consumption, corrosion resistance, high pressure resistance, high temperature resistance and chemical stability.
- This sensor probe is small in size and has a structure that can be placed up, down, laterally, and diagonally in multiple orientations to detect solution spillage, dryness and horizontal level. Can be used as a reminder and alarm function.
- The sensor has a DIP switch. The DIP switch controls the output voltage (high level) of the signal terminal (green line). When the DIP switch is dialed to 5V, the high level is 5V. When the DIP switch is dialed At 3V, the high level is 3.3V.
- Compatible with Arduino motherboard and Raspberry Pi motherboard. for Automatic Irrigation Systems, Aquariums, Plants, in The Garden, in Agriculture etc.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B07ZMGW3QJ |
| Best Sellers Rank | 30,641 in Business, Industry & Science ( See Top 100 in Business, Industry & Science ) 25 in Liquid Level Sensors |
| Brand | CQRobot |
| Country Of Origin | China |
| Current Rating | 12 Milliamps |
| Current rating | 12 Milliamps |
| Customer Reviews | 4.5 out of 5 stars 392 Reviews |
| Item Dimensions | 21 x 3.6 x 7.1 centimetres |
| Item Weight | 0.05 Kilograms |
| Item dimensions L x W x H | 21 x 3.6 x 7.1 centimetres |
| Item weight | 0.05 Kilograms |
| Manufacturer | CQRobot |
| Material | silicone pc |
| Maximum Supply Voltage | 5 Volts (DC) |
| Measurement Accuracy | ±0.5mm |
| Model Number | CQRSENYW002 |
| Mounting Type | Wall Mount |
| Output Type | Digital |
| Sensing Distance | 50 Centimetres |
| Specific Uses For Product | Automatic Irrigation Systems, Aquariums, Plants, Garden, Agriculture, Alarm Function |
| Style | Single Point Contact Type |
| Style Name | Single Point Contact Type |
| Upper Temperature Rating | 105 Degrees Celsius |

## Product Details

- **Brand:** CQRobot
- **Item dimensions L x W x H:** 21 x 3.6 x 7.1 centimetres
- **Item weight:** 0.05 Kilograms
- **Material:** silicone pc
- **Style:** Single Point Contact Type

## Images

![CQRobot Contact Water/Liquid Level Sensor Compatible with Raspberry Pi/Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in the Garden, in Agriculture etc. - Image 1](https://m.media-amazon.com/images/I/6196nLvX7JL.jpg)

## Questions & Answers

**Q: can this be mounted to the lid of a bucket and read the water levels inside as they go down? or is this basically a contact switch that detects liquid**
A: It's just a liquid contact switch.

**Q: Can I purchase just the board with the 3-wire connector somewhere?**
A: Sorry, buyers only sell kits.

**Q: Is there a Fritzing (or other schematic app) component that I can download for this product?**
A: Hello ,
For specific product descriptions, you can log in to our official link address to view, hope it will be helpful to you, if you have any questions, please contact me in time, thank you!
Wiki:
 http://www.cqrobot.wiki/index.php/Liquid_Level_Sensor

**Q: What is vin vs in for the breakout board? which pin varies when in contact with water? i assuming one connects to the 5v and other varies voltage?**
A: Hi! It is recommended that you refer to the technical information of this product (Wiki: http://www.cqrobot.wiki/index.php/Contact_Water/Liquid_Level_Sensor_SKU:_CQRSENYW002).
If you have any questions, please feel free to contact us!

## Customer Reviews

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐ Reliable non-contact liquid detection, but expensive and lacks printed instructions
*by A***R on 12 January 2026*

💧 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. ✔️

### ⭐⭐⭐⭐⭐ Very easy to set up
*by V***I on 1 February 2026*

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.

## Frequently Bought Together

- CQRobot Contact Water/Liquid Level Sensor Compatible with Raspberry Pi/Arduino. for Automatic Irrigation Systems, Aquariums, Plants, in The Garden, in Agriculture etc.
- CQRobot TDS (Total Dissolved Solids) Meter Sensor Compatible with Raspberry Pi/Arduino Board. for Liquid Quality Analysis Teaching, Scientific Research, Laboratory, Online Analysis, etc.
- PH Sensor for Arduino, PH0-14 Value Detect Sensor Module + PH Electrode Probe BNC, PH Sensor UNO, PH Sensor Arduino Kit, PH Sensor Raspberry Pi Kit, by HQ&LP

---

## 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/171885566-cqrobot-contact-water-liquid-level-sensor-compatible-with-raspberry-pi](https://www.desertcart.co.za/products/171885566-cqrobot-contact-water-liquid-level-sensor-compatible-with-raspberry-pi)

---

*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-21*