Attributes

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

6 reviews

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.

5 FAQ

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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