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

Technical Specifications

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)

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 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);
}

Advanced Features

// 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

// 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;
}

// 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");
}

// 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;
}

Troubleshooting