Blog

XKC-Y25-V Non-Contact Water Liquid Level Sensor

Posted by

Ekostra Electronics

On April 7, 2025

Comments Off

XKC-Y25-V Non-Contact Water Liquid Level Sensor

Capacitive Detection Without Physical Contact

Introduction

The XKC-Y25-V is a non-contact liquid level sensor that detects water presence through capacitive sensing without direct contact with the liquid. This makes it ideal for applications requiring hygienic measurement or where sensor corrosion is a concern.

Key Features

🚫💧 Non-Contact

Detects through container walls without liquid contact

🔘 Digital Output

Simple HIGH/LOW signal for water detection

⚡ Low Power

Operates at 3.3V-5V with minimal current draw

📏 Adjustable

Sensitivity control via potentiometer

Technical Specifications

Operating Voltage	3.3V – 5V DC
Output Type	Digital (TTL)
Detection Method	Capacitive (non-contact)
Max Container Thickness	5mm (plastic/glass)
Current Consumption	<15mA
Response Time	<100ms
Operating Temperature	-10°C to +50°C
Protection Rating	IP65 (sensor only)

Pin Configuration

Pin	Label	Description	Arduino Connection
1	VCC	Power (3.3V-5V)	5V
2	GND	Ground	GND
3	OUT	Digital output	D2
4	EN	Enable pin (optional)	D3 (or leave unconnected)

Note: The sensor must be mounted flush against the container’s outer surface for proper operation

Wiring with Arduino

// Basic Connections:
// VCC → 5V
// GND → GND
// OUT → D2 (digital input)

// Optional:
// EN → D3 (digital output for enable/disable)

// Mount sensor against container wall
// Adjust sensitivity potentiometer as needed

// Basic Connections:

// VCC → 5V

// GND → GND

// OUT → D2 (digital input)

// Optional:

// EN → D3 (digital output for enable/disable)

// Mount sensor against container wall

// Adjust sensitivity potentiometer as needed

Important: Container material must be non-metallic (plastic/glass) for proper detection

Basic Water Detection Example

// XKC-Y25-V Water Level Sensor Basic Example
const int sensorPin = 2;

void setup() {
  Serial.begin(9600);
  pinMode(sensorPin, INPUT);
}

void loop() {
  int waterDetected = digitalRead(sensorPin);
  
  if (waterDetected == HIGH) {
    Serial.println("Water detected!");
  } else {
    Serial.println("No water detected");
  }
  
  delay(500);
}

// XKC-Y25-V Water Level Sensor Basic Example

const int sensorPin = 2;

void setup() {

Serial.begin(9600);

pinMode(sensorPin, INPUT);

}

void loop() {

int waterDetected = digitalRead(sensorPin);

if (waterDetected == HIGH) {

Serial.println("Water detected!");

} else {

Serial.println("No water detected");

}

delay(500);

}

Advanced Features

Sensitivity Adjustment

// Physical adjustment via potentiometer:
// 1. Apply water to desired detection level
// 2. Slowly rotate potentiometer until LED changes state
// 3. Test with varying water levels

// Physical adjustment via potentiometer:

// 1. Apply water to desired detection level

// 2. Slowly rotate potentiometer until LED changes state

// 3. Test with varying water levels

Enable Control

// Power saving with enable pin
void setup() {
  pinMode(EN_PIN, OUTPUT);
}

void takeMeasurement() {
  digitalWrite(EN_PIN, HIGH);
  delay(50); // Allow stabilization
  bool waterPresent = digitalRead(SENSOR_PIN);
  digitalWrite(EN_PIN, LOW);
  return waterPresent;
}

// Power saving with enable pin

void setup() {

pinMode(EN_PIN, OUTPUT);

}

void takeMeasurement() {

digitalWrite(EN_PIN, HIGH);

delay(50); // Allow stabilization

bool waterPresent = digitalRead(SENSOR_PIN);

digitalWrite(EN_PIN, LOW);

return waterPresent;

}

Multiple Sensors

// Monitor multiple levels
void checkLevels() {
  bool lowLevel = readSensor(LOW_SENSOR);
  bool highLevel = readSensor(HIGH_SENSOR);
  
  if (highLevel) Serial.println("Tank full");
  else if (lowLevel) Serial.println("Tank half full");
  else Serial.println("Tank empty");
}

// Monitor multiple levels

void checkLevels() {

bool lowLevel = readSensor(LOW_SENSOR);

bool highLevel = readSensor(HIGH_SENSOR);

if (highLevel) Serial.println("Tank full");

else if (lowLevel) Serial.println("Tank half full");

else Serial.println("Tank empty");

}

Debounce Logic

// Prevent rapid state changes
bool stableRead(int pin) {
  int count = 0;
  for (int i = 0; i < 5; i++) { if (digitalRead(pin)) count++; delay(10); } return count >= 3;
}

// Prevent rapid state changes

bool stableRead(int pin) {

int count = 0;