Description
Reviews
| Brand | - |
| Category | Robotics / STEM Teaching Tools / Sensors |
| Origin | - |
| Model Number | M03 / M04 |
| Detection Type | Non-Contact Capacitive |
| Operating Voltage | 3.3V - 5.5V DC |
| Output Signal | Digital Switch (High/Low) |
| PCB Color | Green |
| Compatible Liquids | Water, Oil, Acidic Solutions |
| Container Compatibility | Glass, Plastic, Acrylic (Non-metal) |
| Response Time | < 1 Second |
| Interface | 3-Pin Header (VCC, GND, OUT) |
| Application | IoT Projects, Arduino, Raspberry Pi |
Anonymous
Mar 30, 2026
Rating: 5/5
Simple integration
Integrated easily into my ESP32 smart home setup. The digital output makes coding the logic trivial. Highly recommend for anyone building liquid level alerts.
Anonymous
Mar 27, 2026
Rating: 5/5
Essential for hydroponic systems
I bought four of these for my nutrient tank monitoring system. They handle the mild acidic solution without any corrosion issues since they don't touch the liquid directly.
Anonymous
Mar 14, 2026
Rating: 4/5
Reliable but sensitive to noise
Overall a great module. In a noisy electrical environment, I had to add a small capacitor to smooth out the signal, but otherwise, it performs exactly as described.
Anonymous
Mar 11, 2026
Rating: 5/5
Great for university projects
Used this for my final year embedded systems project. Documentation was clear enough to get it working quickly. The non-contact feature saved us a lot of design headaches.
Anonymous
Mar 04, 2026
Rating: 4/5
Good value but needs calibration
Works well with my Arduino Uno. You do need to spend a few minutes calibrating the sensitivity potentiometer based on your container thickness, but once set, it is very stable.
Anonymous
Mar 03, 2026
Rating: 5/5
Perfect for my aquarium project
This sensor works flawlessly through the glass of my aquarium. No need to drill holes or risk leaks. The sensitivity is adjustable and it triggers reliably every time.
Q: Is this module compatible with 3.3V microcontrollers like the ESP8266?
A: Absolutely. The module operates within a voltage range of 3.3V to 5.5V, making it fully compatible with both 3.3V and 5V logic microcontrollers.
Q: What happens if the container is made of stainless steel?
A: This sensor will not work with metal containers. The capacitive sensing principle requires a non-conductive barrier between the sensor and the liquid. Metal containers block the electric field.
Q: Does it work with oil or only water?
A: It works with various liquids including water, oil, and acidic solutions, provided the liquid has a dielectric constant different from air and the container is non-metallic.
Q: How do I adjust the sensitivity?
A: There is a small blue potentiometer on the back of the PCB. Use a small screwdriver to turn it clockwise to increase sensitivity or counter-clockwise to decrease it until the indicator LED behaves as desired.
Q: Can this sensor detect water levels through a thick plastic container?
A: Yes, it can detect through non-metallic containers like plastic or glass. However, if the wall thickness exceeds 10mm, you may need to adjust the sensitivity potentiometer carefully or test specific thickness limits.
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