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void setup() {
  //serial connection setup
  //opens serial port, sets data rate to 9600 bps
  Serial.begin(9600);
  //clear all data that’s been place in already
  Serial.println("CLEARDATA");
  //define the column headings  (PLX-DAQ command)
  Serial.println("LABEL,t,voltage,current,power,light_intensity");
}

void loop() {
  //measuring voltage using "B25 0 to 25V" Voltage Sensor
  //measuring current using "INA169" Current Sensor
  //reading of the current and voltage from sensors
  float voltage = analogRead(A0) * 5.0 * 5.0 / 1023;     //PV panel voltage
  float current = analogRead(A1) * 5.0 / 1023;           //PV panel current
  float power = voltage * current;                       //PV panel power
  
  //measuring light intensity using TEMT6000 on analog pin A2
  int lightIntensityRaw = analogRead(A2);                // Read raw value
  float lightIntensity = lightIntensityRaw * (5.0 / 1023);  // Convert to voltage

  //allows the serial port to send data to Excel in real-time
  Serial.print("DATA,TIME,"); // PLX-DAQ command
  Serial.print(voltage);       // send the voltage to serial port
  Serial.print(",");
  Serial.print(current);       // send the current to serial port
  Serial.print(",");
  Serial.print(power);         // send the power to serial port
  Serial.print(",");
  Serial.println(lightIntensity); // send light intensity to serial port

  delay(1000); //wait 1s before repeating
}