Smoke detector using MQ-2 Gas sensor

1#include <MaxMatrix.h>
2int buzzer = 10;
3int smokeA0 = A5;
4int
5  sensorThres = 400;
6int DIN = 7;
7int CLK = 6;
8int CS = 5;
9int maxInUse
10  = 1;
11byte buffer[20];
12char text[] = "a";
13MaxMatrix m(DIN, CS, CLK, maxInUse);
14
15void
16  setup() {
17  pinMode(buzzer, OUTPUT);
18  pinMode(smokeA0, INPUT);
19  Serial.begin(9600);
20
21  {
22 m.init();
23 m.setIntensity(8);
24}
25}
26
27void loop() {
28  int
29  analogSensor = analogRead(smokeA0);
30
31  Serial.print("Pin A0: ");
32  Serial.println(analogSensor);
33
34  // Checks if it has reached the threshold value
35  if (analogSensor > sensorThres)
36
37  {
38
39    tone(buzzer, 1000, 200);
40  }
41  else
42  {
43    
44    noTone(buzzer);
45
46  }
47  delay(100);
48{
49  m.setDot(7, 7, true);
50  delay(300);
51  m.setDot(6,
52  6, true);
53  delay(300);
54m.setDot(5, 5, true);
55  delay(300);
56  m.setDot(4,
57  4, true);
58  delay (300);
59  m.setDot(3, 3, true);
60  delay(300);
61  m.setDot(2,
62  2, true);
63  delay(300);
64  m.setDot(1, 1, true);
65  delay(300);
66  m.setDot(0,
67  0, true);
68  delay(300);
69  m.setDot(0, 7, true);
70  delay(300);
71  m.setDot(1,
72  6, true);
73  delay(300);
74  m.setDot(2, 5, true);
75  delay(300);
76  m.setDot(3,
77  4, true);
78  delay(300);
79  m.setDot(4, 3, true);
80  delay(300);
81  m.setDot(5,
82  2, true);
83  delay(300);
84  m.setDot(6, 1, true);
85  delay(300);
86  m.setDot(7,
87  0, true);
88  delay(300);
89  
90 
91  m.clear();
92  delay(1000);}
93} 
94

1#include <MaxMatrix.h>
2int buzzer = 10;
3int smokeA0 = A5;
4int  sensorThres = 400;
5int DIN = 7;
6int CLK = 6;
7int CS = 5;
8int maxInUse  = 1;
9byte buffer[20];
10char text[] = "a";
11MaxMatrix m(DIN, CS, CLK, maxInUse);
12
13void  setup() {
14  pinMode(buzzer, OUTPUT);
15  pinMode(smokeA0, INPUT);
16  Serial.begin(9600);
17  {
18 m.init();
19 m.setIntensity(8);
20}
21}
22
23void loop() {
24  int  analogSensor = analogRead(smokeA0);
25
26  Serial.print("Pin A0: ");
27  Serial.println(analogSensor);
28  // Checks if it has reached the threshold value
29  if (analogSensor > sensorThres)
30  {
31
32    tone(buzzer, 1000, 200);
33  }
34  else
35  {
36    
37    noTone(buzzer);
38  }
39  delay(100);
40{
41  m.setDot(7, 7, true);
42  delay(300);
43  m.setDot(6,  6, true);
44  delay(300);
45m.setDot(5, 5, true);
46  delay(300);
47  m.setDot(4,  4, true);
48  delay (300);
49  m.setDot(3, 3, true);
50  delay(300);
51  m.setDot(2,  2, true);
52  delay(300);
53  m.setDot(1, 1, true);
54  delay(300);
55  m.setDot(0,  0, true);
56  delay(300);
57  m.setDot(0, 7, true);
58  delay(300);
59  m.setDot(1,  6, true);
60  delay(300);
61  m.setDot(2, 5, true);
62  delay(300);
63  m.setDot(3,  4, true);
64  delay(300);
65  m.setDot(4, 3, true);
66  delay(300);
67  m.setDot(5,  2, true);
68  delay(300);
69  m.setDot(6, 1, true);
70  delay(300);
71  m.setDot(7,  0, true);
72  delay(300);
73  
74 
75  m.clear();
76  delay(1000);}
77} 
78