Science station code. Credit to Ahmed Awadallah

Arduino Code/Humidity_Code_V2.ino

+
+const int humPin = A0;
+int readingNumber = 0;
+double readingSum = 0;
+boolean calibrated = true;
+double calibratedValue = 640.0;
+void setup() {
+  // initialize serial communications:
+  Serial.begin(9600);
+}
+
+void loop() {
+  // read the value from the pin
+  double humReading = 0;
+  humReading = analogRead(humPin); 
+  readingSum+=humReading;
+  // calculate the sensor humidity
+  if(calibrated){
+    double sensorRH = humReading/calibratedValue*100.0;
+    Serial.print(sensorRH);
+    Serial.println("%");
+    // wait a second
+    delay(1000);
+  }
+  //Water Calibration
+  if(readingNumber==10 && calibrated){
+    double readingAvg=readingSum/10.0;
+    Serial.println(readingAvg);
+    Serial.println(humReading);
+    readingNumber = 0;
+    readingSum = 0; 
+  }
+  delay(100);
+  readingNumber++;
+}

Arduino Code/SensorCodepH.ino

+int TimeBetweenReadings = 500;
+void setup() {
+  // initialize serial communication at 9600 bits per second:
+  Serial.begin(9600);
+  Serial.println("Time (s)    Voltage Readings from A0 (N)");
+}
+void loop() {
+float Count;
+float Voltage;
+float SensorReading;
+int ReadingNumber=0;
+float Time;//the print below does the division first to avoid overflows
+  //Serial.print(ReadingNumber/1000.0*TimeBetweenReadings); 
+  Count = analogRead(A0);
+  Voltage = Count / 1023 * 5.0;// convert from count to raw voltage
+  //Serial.print("            ");
+  Serial.print("Voltage: ");
+  Serial.println(Voltage);
+  Serial.print("pH: ");
+  Serial.println(Voltage/0.36);
+  delay(TimeBetweenReadings);// delay in between reads for stability
+  ReadingNumber++;
+}