Liquid Level Sensor Module DC 5V

Product description

This liquid level sensor module is a practical solution for detecting the presence or absence of liquid in a container, making it suitable for Arduino projects, automation systems, warning systems, dispensers, small tanks, or laboratory applications. The optical sensor mounted at the end of the cable detects contact with liquid, while the electronic board provides a signal that can be easily read by a microcontroller.

The module includes an adjustment potentiometer, useful for setting the detection threshold, as well as connection pins for quick integration into projects. Thanks to the extension cable, the sensor can be mounted separately from the control board, making installation easier in enclosures, containers, or compact systems.

It is ideal for DIY projects, educational prototypes, water level monitoring, dry-run protection, or simple alarm systems.

Technical details

• Product type: liquid level sensor module with optical probe
• Operating principle: optical detection of liquid presence
• Typical supply voltage: 3.3 – 5 V DC
• Output: digital, compatible with microcontrollers
• Sensitivity/threshold adjustment: via integrated potentiometer
• LED indicator on the module for status/signal
• Cable probe for remote mounting away from the electronic board
• Dedicated connector for the sensor
• Interface pins included
• Compatible with Arduino, ESP32, ESP8266, Raspberry Pi Pico boards, and other logic-compatible platforms
• Recommended use: water and non-corrosive liquids, in monitoring and automation projects
• Simple panel or container mounting, depending on the application

Sample schematic and code

Example connection to Arduino UNO:

• Module VCC → Arduino 5V
• Module GND → Arduino GND
• Module OUT / DO → Arduino digital pin D2

Sample code:

const int sensorPin = 2;

const int ledPin = 13;

void setup() {

pinMode(sensorPin, INPUT);

pinMode(ledPin, OUTPUT);

Serial.begin(9600);

}

void loop() {

int sensorState = digitalRead(sensorPin);

if (sensorState == HIGH) {

Serial.println("Liquid detected");

digitalWrite(ledPin, HIGH);

} else {

Serial.println("Liquid not detected");

digitalWrite(ledPin, LOW);

}

delay(500);

}

Note: depending on the potentiometer adjustment and the module type, the output logic may be reversed. If the displayed messages are opposite to the real situation, swap the HIGH condition with LOW in the code.

Package content

• 1 × liquid level sensor electronic module
• 1 × optical probe with cable
• 2 × header pin sets for connection