Multitasking And Real-Time Arduino System

1//Pin definition
2static int trigger = 9; // Pin HC-SR04
3static int  echo = 8; // Pin HC-SR04
4static int led_HC = 10; // Pin HC-SR04
5static int  led_pulsed = 13; // Timed pulsed led
6static int led_temperature = 12; // Led  to temperature overflow
7static int LM35_analogPin = 0; // analog pin for temperature  sensor
8
9
10// Variables for calculating the distance with sensor HC-SR04
11long  duration; // Flight time of signal
12long distance;  // Calculated distance 
13float  temp_C; // temperature variable (Celsius degrees)
14
15void setup() {
16  //Serial  communication
17  Serial.begin(9600);
18
19  //Pin setup
20  pinMode(trigger,  OUTPUT);
21  pinMode(echo, INPUT);
22  pinMode(led_HC, OUTPUT);
23  pinMode(led_pulsed,  OUTPUT);
24  pinMode(led_temperature, OUTPUT);
25
26  digitalWrite(echo, LOW);
27  digitalWrite(trigger, LOW);
28  digitalWrite(led_HC, LOW);
29  digitalWrite(led_pulsed,  LOW);
30  digitalWrite(led_temperature, LOW);
31
32  //Analog input
33  analogReference(INTERNAL);  // prendo la misura analogica di riferimento di Arduino a 1.1V
34
35  //Variable  initialization of the distance
36  duration = 0;
37  distance = 0;
38}
39
40void  loop() {
41}
42
43void loop1(3000) {
44  //Send a HIGH pulse to the trigger  pin
45  digitalWrite(trigger, HIGH);
46  //I leave it to the HIGH value for 10  microseconds
47  delayMicroseconds(10);
48  //I carry it back to the LOW state
49  digitalWrite(trigger, LOW);
50
51  //I get the number of microseconds for which  the echo PIN is left in HIGH state
52  duration = pulseIn(echo, HIGH);
53
54  /*Sound velocity is 340 meters per second, or 29 microseconds per cent.
55    Our  impulse travels back and forth, so to calculate the distance
56   Between the sensor  and our obstacle we need to do:*/
57  distance = duration / 29 / 2;
58
59  //  Turn on the led if there is an obstacle at a distance of less than 10 cm
60  if  (distance < 10) {
61    digitalWrite(led_HC, HIGH);
62  }
63  else {
64    digitalWrite(led_HC,  LOW);
65  }
66  // Print on the serial buffer
67  Serial.print("duration : ");
68  Serial.print(duration);
69  Serial.print(" - distance : ");
70  Serial.println(distance);
71}
72
73void  loop2(7000) {
74  int i;
75  Serial.println("Pulsed LED");
76  // Code for  the flashing of the led
77  for (i = 0; i < 5; i++)
78  {
79    digitalWrite(led_pulsed,  HIGH);
80    delay(500);
81    digitalWrite(led_pulsed, LOW);
82    delay(500);
83  }
84}
85
86void loop3(11000) {
87  float sum_temp = 0;
88  float average_temp  = 0;
89  /* Acquire 3 values from the sensor every 500 milliseconds.
90     Through  an appropriate conversion I get the measure in degrees Celsius.
91     Calculate  the average of subsequent measurements.*/
92  for (int i = 0; i < 3; i++){  
93    delay(500);
94    temp_C = (1.1 * analogRead(LM35_analogPin) * 100.0) / 1024;
95    sum_temp += temp_C;
96  }
97  average_temp = sum_temp / 3;
98  // If the  temperature is greater than 23 degrees, turn on the led
99  if (average_temp >  23) {
100    digitalWrite(led_temperature, HIGH);
101  }
102  else {
103    digitalWrite(led_temperature,  LOW);
104  }
105  Serial.print("Temperature : ");
106  Serial.println(average_temp);
107}
108
109
110
111

1//Pin definition
2static int trigger = 9; // Pin HC-SR04
3static int
4  echo = 8; // Pin HC-SR04
5static int led_HC = 10; // Pin HC-SR04
6static int
7  led_pulsed = 13; // Timed pulsed led
8static int led_temperature = 12; // Led
9  to temperature overflow
10static int LM35_analogPin = 0; // analog pin for temperature
11  sensor
12
13
14// Variables for calculating the distance with sensor HC-SR04
15long
16  duration; // Flight time of signal
17long distance;  // Calculated distance 
18float
19  temp_C; // temperature variable (Celsius degrees)
20
21void setup() {
22  //Serial
23  communication
24  Serial.begin(9600);
25
26  //Pin setup
27  pinMode(trigger,
28  OUTPUT);
29  pinMode(echo, INPUT);
30  pinMode(led_HC, OUTPUT);
31  pinMode(led_pulsed,
32  OUTPUT);
33  pinMode(led_temperature, OUTPUT);
34
35  digitalWrite(echo, LOW);
36
37  digitalWrite(trigger, LOW);
38  digitalWrite(led_HC, LOW);
39  digitalWrite(led_pulsed,
40  LOW);
41  digitalWrite(led_temperature, LOW);
42
43  //Analog input
44  analogReference(INTERNAL);
45  // prendo la misura analogica di riferimento di Arduino a 1.1V
46
47  //Variable
48  initialization of the distance
49  duration = 0;
50  distance = 0;
51}
52
53void
54  loop() {
55}
56
57void loop1(3000) {
58  //Send a HIGH pulse to the trigger
59  pin
60  digitalWrite(trigger, HIGH);
61  //I leave it to the HIGH value for 10
62  microseconds
63  delayMicroseconds(10);
64  //I carry it back to the LOW state
65
66  digitalWrite(trigger, LOW);
67
68  //I get the number of microseconds for which
69  the echo PIN is left in HIGH state
70  duration = pulseIn(echo, HIGH);
71
72
73  /*Sound velocity is 340 meters per second, or 29 microseconds per cent.
74    Our
75  impulse travels back and forth, so to calculate the distance
76   Between the sensor
77  and our obstacle we need to do:*/
78  distance = duration / 29 / 2;
79
80  //
81  Turn on the led if there is an obstacle at a distance of less than 10 cm
82  if
83  (distance < 10) {
84    digitalWrite(led_HC, HIGH);
85  }
86  else {
87    digitalWrite(led_HC,
88  LOW);
89  }
90  // Print on the serial buffer
91  Serial.print("duration : ");
92
93  Serial.print(duration);
94  Serial.print(" - distance : ");
95  Serial.println(distance);
96}
97
98void
99  loop2(7000) {
100  int i;
101  Serial.println("Pulsed LED");
102  // Code for
103  the flashing of the led
104  for (i = 0; i < 5; i++)
105  {
106    digitalWrite(led_pulsed,
107  HIGH);
108    delay(500);
109    digitalWrite(led_pulsed, LOW);
110    delay(500);
111
112  }
113}
114
115void loop3(11000) {
116  float sum_temp = 0;
117  float average_temp
118  = 0;
119  /* Acquire 3 values from the sensor every 500 milliseconds.
120     Through
121  an appropriate conversion I get the measure in degrees Celsius.
122     Calculate
123  the average of subsequent measurements.*/
124  for (int i = 0; i < 3; i++){  
125
126    delay(500);
127    temp_C = (1.1 * analogRead(LM35_analogPin) * 100.0) / 1024;
128
129    sum_temp += temp_C;
130  }
131  average_temp = sum_temp / 3;
132  // If the
133  temperature is greater than 23 degrees, turn on the led
134  if (average_temp >
135  23) {
136    digitalWrite(led_temperature, HIGH);
137  }
138  else {
139    digitalWrite(led_temperature,
140  LOW);
141  }
142  Serial.print("Temperature : ");
143  Serial.println(average_temp);
144}
145
146
147
148