// Pin Definitions
#define TDS_PIN 34          // TDS sensor connected to GPIO34 (ADC1)
#define BUZZER_PIN 13      // Buzzer connected to GPIO13
// Calibration Values
#define Tds_Limit 500   // TDS limit for clean water (adjust for lake water)
#define TDS_FACTOR 0.5       // Default TDS factor (calibrate this value)
#define REF_VOLTAGE 3.3        // ESP32 Reference Voltage (5V)
#define ADC_RESOLUTION 4095  // 12-bit ADC resolution for ESP32

void setup() {
  Serial.begin(115200);
  pinMode(TDS_PIN, INPUT);
  pinMode(BUZZER_PIN, OUTPUT);
}
void loop() {
  // Read TDS Sensor Data
  float TdsSensor = analogRead(TDS_PIN);
  float voltage = (TdsSensor * REF_VOLTAGE) / ADC_RESOLUTION;
  float tdsValue = (voltage / TDS_FACTOR) * 100;
  // Display alerts on Serial Monitor
  Serial.print("TDS Value: ");
  Serial.print(tdsValue);
  Serial.println(" ppm");
  if (tdsValue > Tds_Limit) {
    digitalWrite(BUZZER_PIN, HIGH);
    } 
  else {
    digitalWrite(BUZZER_PIN, LOW);
    delay(1000);}
}