Water temperature sensor for water heater boilers

1const int sensor=A5; // Assigning analog pin A5 to variable 'sensor'
2int tempc=0; //variable to store temperature in degree Celsius
3int delayread=100; //delay of 0.1 secs between readings
4float vout=0; //temporary variable initialise
5float voutread=0; //temporary variable to hold sensor reading
6float voutmax; //temporary variable to hold max sensor reading
7float voutmin; //temporary variable to hold min sensor reading
8
9void setup() {
10pinMode(sensor,INPUT); // Configuring sensor pin as input
11Serial.begin(9600);
12}
13
14// LM35 is very sensitive so an "electric inertia" is applied before its output.
15// For this, 100 readings are taking at the "delay time" interval and
16// then the average between max and min is used as output
17
18void loop() {
19startcycle:
20voutmax=0;
21voutmin=1024;
22for (int i=1; i<=100;i++) // 100 readings in total
23{
24  voutread=analogRead(sensor); //Reading the value from sensor
25  if (voutread>voutmax) voutmax=voutread; // Checking max value
26  if (voutread<voutmin) voutmin=voutread;  // Checking min value
27  delay(delayread); // Delay time before taking the next reading
28}
29
30vout=(voutmax+voutmin)/2;
31vout=(vout*5/1023); // transpose to voltage (V)
32vout=(vout*1000/10); // transpose to temperature since 1oC = 10mV (for LM35)
33tempc=round(vout); // Storing value in Degree Celsius
34Serial.print("Temp=");
35Serial.print("\t");
36Serial.print(tempc); // Print out the value
37Serial.print("\t");
38Serial.print("oC");
39Serial.println();
40
41// The procedure starts over again
42goto startcycle;
43}