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#define PH_SENSOR 0     // A0 corresponds to the digital pin number 0 in some environments  
#define TDS_SENSOR 1    // A1 corresponds to the digital pin number 1 in some environments  
#define PH_OFFSET 0.00  // pH offset for calibration  
#define TDS_FACTOR 0.5  // TDS conversion factor  
void setup() {  
    Serial.begin(9600);  // Initialize serial communication at 9600 baud  
        Serial.println("pH and TDS Monitoring System Initialized...");  
        }  
        void loop() {  
            // Read raw values from sensors  
                int phRaw = analogRead(PH_SENSOR);              // Read pH sensor value  
                    int tdsRaw = analogRead(TDS_SENSOR);            // Read TDS sensor value  
                        // Convert the analog reading to voltage  
                            float voltage = phRaw * (5.0 / 1023.0);         // Convert to voltage (0-5V)  
                                float phValue = (voltage + PH_OFFSET);          // Calculate adjusted pH  
                                    phValue = phValue * 3.5;                        // Adjust value based on sensor specifications  
                                        // Calculate TDS value  
                                            float tdsValue = tdsRaw * TDS_FACTOR;           // Convert raw TDS value  
                                                // Output pH and TDS values to Serial Monitor  
                                                    Serial.print("pH: ");  
                                                        Serial.print(phValue, 2);                        // Print pH value with 2 decimals  
                                                            Serial.print(" | TDS: ");  
                                                                Serial.print(tdsValue, 2);                       // Print TDS value with 2 decimals  
                                                                    Serial.println(" ppm");                           // Print units  

Line: 1:9: Cannot find name 'PH_SENSOR'.Line: 2:9: Cannot find name 'TDS_SENSOR'.Line: 4:9: Cannot find name 'PH_OFFSET'.Line: 5:9: Cannot find name 'TDS_FACTOR'.Line: 7:6: Cannot find name 'setup'.Line: 8:5: Cannot find name 'Serial'.Line: 9:9: Cannot find name 'Serial'.Line: 12:14: Cannot find name 'loop'.Line: 14:17: Cannot find name 'int'. Did you mean 'Intl'?Line: 14:21: Cannot find name 'phRaw'.Line: 14:29: Cannot find name 'analogRead'.Line: 14:40: Cannot find name 'PH_SENSOR'.Line: 15:21: Cannot find name 'int'.Line: 15:25: Cannot find name 'tdsRaw'.Line: 15:34: Cannot find name 'analogRead'.Line: 15:45: Cannot find name 'TDS_SENSOR'.Line: 18:29: Cannot find name 'float'.Line: 18:35: Cannot find name 'voltage'.Line: 18:45: Cannot find name 'phRaw'.Line: 19:33: Cannot find name 'float'.Line: 19:39: Cannot find name 'phValue'.Line: 19:50: Cannot find name 'voltage'.Line: 19:60: Cannot find name 'PH_OFFSET'.Line: 20:37: Cannot find name 'phValue'.Line: 20:47: Cannot find name 'phValue'.Line: 23:45: Cannot find name 'float'.Line: 23:51: Cannot find name 'tdsValue'.Line: 23:62: Cannot find name 'tdsRaw'.Line: 23:71: Cannot find name 'TDS_FACTOR'.Line: 26:53: Cannot find name 'Serial'.Line: 27:57: Cannot find name 'Serial'.Line: 27:70: Cannot find name 'phValue'.Line: 28:61: Cannot find name 'Serial'.Line: 29:65: Cannot find name 'Serial'.Line: 29:78: Cannot find name 'tdsValue'.Line: 30:69: Cannot find name 'Serial'.Line: 32:73: Cannot find name 'delay'.Line: 1:9: ';' expected.Line: 2:9: ';' expected.Line: 4:9: ';' expected.Line: 5:9: ';' expected.Line: 7:14: ';' expected.Line: 12:21: ';' expected.Line: 14:17: Unexpected keyword or identifier.Line: 15:21: Unexpected keyword or identifier.Line: 18:29: Unexpected keyword or identifier.Line: 19:33: Unexpected keyword or identifier.Line: 23:45: Unexpected keyword or identifier.

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