Temperature based fan speed control

1#define triacPulse 10
2#define SW 7
3#define ZVC 2  //we can declare  onlly pin 2 or 3 here because these both have interrupt read ability
4int tempmax=50;
5int  tempmin=30;
6
7int x = 0;
8void setup()
9{  Serial.begin(115200);
10   pinMode(ZVC,  INPUT_PULLUP);
11   pinMode(A0, INPUT);
12   pinMode(triacPulse, OUTPUT);
13   pinMode(11,INPUT);
14   pinMode(12,INPUT);
15   pinMode(13,INPUT);
16}
17float  temp()
18  {  int val = analogRead(A0);
19     float temp1 = ( val/1023.0)*500;
20     return temp1;
21   }
22void pulse()
23{ delayMicroseconds(x); // read AD0
24  digitalWrite(triacPulse, HIGH);
25  delayMicroseconds(50);  //delay 50 uSec on  output pulse to turn on triac
26  digitalWrite(triacPulse, LOW);
27}
28void pulse_for_min()
29{  delayMicroseconds(7200); // read AD0
30  digitalWrite(triacPulse, HIGH);
31  delayMicroseconds(50);  //delay 50 uSec on output pulse to turn on triac
32  digitalWrite(triacPulse,  LOW);
33}
34void pulse_for_full()
35{ delayMicroseconds(200); // read AD0
36  digitalWrite(triacPulse, HIGH);
37  delayMicroseconds(50);  //delay 50 uSec on  output pulse to turn on triac
38  digitalWrite(triacPulse, LOW);
39}
40void loop()  {
41  float temperature=temp(); 
42  bool full_on = digitalRead(11);
43  bool  full_off = digitalRead(13);
44  bool automatic = digitalRead(12);
45    if(automatic==HIGH  && full_on==LOW && full_off==LOW)
46       {    if((temp >= tempmin) && (temp <=  tempmax)) 
47               {  // if temperature is higher than minimum temp &  less than maximum temperature
48                 int x = map(temp(), tempmin, tempmax,7200  ,200 );
49                 Serial.println(digitalRead(ZVC));
50                 attachInterrupt(0,  pulse, FALLING); // attach Interrupt at PIN2
51               }
52           if(temp>=tempmax)
53             pulse_for_full();
54           if(temp<=tempmax)
55              pulse_for_min();  
56       }      
57   if(automatic==LOW && full_on==HIGH && full_off==LOW)
58        pulse_for_full();
59   if(automatic==LOW && full_on==LOW && full_off==HIGH)
60         pulse_for_min();
61
62}
63