nearly final version of my LM35LCD project... :)

LM35LCD/LM35LCD.ino

@@ -1,37 +1,52 @@
+// Written 2015 by Johannes Findeisen <you@hanez.org>
+
 #include <LiquidCrystal.h>
 
+// Initialize the LCD code. Take care of the pins I use. The first two pins 
+// are 12 and 11 in most examples around the web. I use pin 7 and 6 because of 
+// nicer wiring on my breadboard.
+// Read this for more information:
+// https://www.arduino.cc/en/Tutorial/LiquidCrystal
 LiquidCrystal lcd(7, 6, 5, 4, 3, 2);
 
-int   samples[30];
-float tempC;
+// Define how many samples should be collected every $collectDelay miliseconds.
+// After sample collection the temperature is beeing calculated and then
+// send to the LCD. 
+int samples = 30;
+
+// Collect delay between each sample. 
+int collectDelay = 2000;
+
+// The pin where the status LED is connected to.
+int ledPin = 13;
+
+// The analog input pin where the LM35 is connected to.
+int tempPin = 0;
+
+// Just some variable initializations
+float tempC = 0;
 float tempClast = 0;
-float tempF;
-int   tempPin = 0;
+float tempF = 0;
 
 void setup() {
-  pinMode(13, OUTPUT);
+  pinMode(ledPin, OUTPUT);
   lcd.begin(16, 2);
   lcd.print("Temperature:");
+  lcd.setCursor(0, 1);
+  tempC = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
+  tempF = (tempC * 9) / 5 + 32;
+  lcd_print();
 }
 
-void loop() {
-  int i;
-  tempC = 0;
-  for(i = 0; i <= 29; i++) {
-    samples[i] = (5.0 * analogRead(tempPin) * 100.0) / 1024.0;
-    tempC = tempC + samples[i];
-    digitalWrite(13, HIGH);
-    delay(1000);
-    digitalWrite(13, LOW);
-    delay(1000);
-  }
-  tempC = tempC / 30.0;
-  tempF = (tempC*9) / 5 + 32;
+// Prints results to the display
+void lcd_print() {
   lcd.setCursor(0, 1);
   lcd.print(tempC);
+  lcd.print((char)223);
   lcd.print("C/");
   lcd.print(tempF);
-  lcd.print("F  ");
+  lcd.print((char)223);
+  lcd.print("F");
   if(tempClast > tempC) {
     lcd.print("-");
   } else if(tempClast < tempC) {
@@ -39,5 +54,26 @@ void loop() {
   } else {
     lcd.print("*");
   }
+}
+
+void loop() {
+  int i;
+  tempC = 0;
+  for(i = 0; i <= (samples - 1); i++) {
+    // Read this to understand the temperature calculation:
+    // http://www.danielandrade.net/2008/07/05/temperature-sensor-arduino/
+    tempC = tempC + ((5.0 * analogRead(tempPin) * 100.0) / 1024.0);
+    digitalWrite(ledPin, HIGH);
+    delay((collectDelay / 2));
+    digitalWrite(ledPin, LOW);
+    delay((collectDelay / 2));
+  }
+  // Calculate temperature
+  tempC = tempC / (float)samples;
+  // Celsius to Fahrenheit cobversation
+  tempF = (tempC * 9) / 5 + 32;
+  // Print result to the display
+  lcd_print();
+  // Remember current temperature for next run
   tempClast = tempC;
 }