Arduino Pedestrian Crossing Traffic Lights

Arduino based traffic lights using car lights delay to enable safe pedestrian crossing.

Nov 9, 2017

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Devices & Components

Arduino Uno Rev3

Breadboard (generic)

SparkFun 7-Segment Serial Display - Red

Pushbutton switch 12mm

LED (generic)

Software & Tools

Arduino IDE

Project description

Code

Arduino Pedestrian Traffic Lights Code

arduino

1//leds for both traffic lights
2int sinal_pedestre[2] = {A1, A0};
3int  sinal_carros[3] = {A2, A3, A4};
4//pushbuttonpin
5byte botao = 12;
6//auxiliar  time variables
7unsigned long t_0;
8unsigned long t_1;
9unsigned long t_aux;
10unsigned  int safe_time;
11//Waiting time for a request just after the traffic lights of  the cars open
12unsigned int t = 4000;
13
14//matrix of the display of 7 segments
15int  disp[10][8] = { { 0, 1, 1, 1, 1, 1, 1, 0 }, // = Digit 0
16  { 0, 1, 0, 0, 1, 0,  0, 0 }, // = Digit 1
17  { 0, 0, 1, 1, 1, 1, 0, 1 }, // = Digit 2
18  { 0, 1,  1, 0, 1, 1, 0, 1 }, // = Digit 3
19  { 0, 1, 0, 0, 1, 0, 1, 1 }, // = Digit 4
20  { 0, 1, 1, 0, 0, 1, 1, 1 }, // = Digit 5
21  { 0, 1, 1, 1, 0, 1, 1, 1 }, // =  Digit 6
22  { 0, 1, 0, 0, 1, 1, 0, 0 }, // = Digit 7
23  { 0, 1, 1, 1, 1, 1, 1,  1 }, // = Digit 8
24  { 0, 1, 1, 0, 1, 1, 1, 1 }  // = Digit 9
25};
26
27void  setup() {
28
29  //PinMode of display pins
30  for (int i = 2; i < 9; i++)
31  {
32    pinMode(i, OUTPUT);
33  }
34  //PinMode of leds pins
35  for (int  i = A0; i < A5; i++)
36  {
37    pinMode(i, OUTPUT);
38  }
39  ////PinMode of  pusbutton pin
40  pinMode(botao, INPUT);
41  t_0 = millis();
42}
43
44void  loop() {
45
46  //Show the S of stop at the beginning
47  number_display(5);
48
49  //conting the minimum time that the traffic light will be green for the cars
50  t_1 = millis();
51  if (t_1 - t_0 < t) {
52    safe_time = t_1 - t_0;
53  }
54
55  //green sign for cars and red for pedestrians
56  digitalWrite(sinal_carros[2],  HIGH);
57  digitalWrite(sinal_pedestre[0], HIGH);
58  //while no one makes a request,  the signal will not change.
59  if (digitalRead(botao) == HIGH)
60  {
61
62    delay(8000 - safe_time);
63
64    //red light for cars goes out and yellow  turns on for 2.5 seconds
65    digitalWrite(sinal_carros[2], LOW);
66    digitalWrite(sinal_carros[1],  HIGH);
67
68    delay(2500);
69
70    //Pedestrians sign opens
71    digitalWrite(sinal_carros[1],  LOW);
72    digitalWrite(sinal_carros[0], HIGH);
73    digitalWrite(sinal_pedestre[0],  LOW);
74    digitalWrite(sinal_pedestre[1], HIGH);
75
76    //Countdown to the  pedestrian signal close
77    t_0 = millis();
78    t_aux = 0;
79    while (t_aux  < 5000) {
80      idle_display();
81      t_aux = millis() - t_0;
82    }
83
84    for (int k = 9; k > 0; k--) {
85      number_display(k);
86
87      delay(1000);
88    }
89    //the signals are turned off for the cycle to start again
90    digitalWrite(sinal_carros[0],  LOW);
91    digitalWrite(sinal_pedestre[1], LOW);
92
93    t_0 = millis();
94  }
95
96}
97//function that shows a number in the 7 segment display
98
99void  number_display(int m) {
100
101  for (int j = 2; j < 9; j++) {
102    digitalWrite(j,  disp[m][j - 1]);
103  }
104
105}
106
107void idle_display() {
108  turnOf_display();
109  digitalWrite(3, 1);
110  delay(150);
111  digitalWrite(3, 0);
112  digitalWrite(8,  1);
113  delay(150);
114  digitalWrite(8, 0);
115  digitalWrite(6, 1);
116  delay(150);
117  digitalWrite(6, 0);
118  delay(150);
119
120}
121
122void turnOf_display() {
123  for (int i = 2; i < 9; i++) {
124    digitalWrite(i, 0);
125  }
126}
127

//leds for both traffic lights
int sinal_pedestre[2] = {A1, A0};
int  sinal_carros[3] = {A2, A3, A4};
//pushbuttonpin
byte botao = 12;
//auxiliar  time variables
unsigned long t_0;
unsigned long t_1;
unsigned long t_aux;
unsigned  int safe_time;
//Waiting time for a request just after the traffic lights of  the cars open
unsigned int t = 4000;

//matrix of the display of 7 segments
int  disp[10][8] = { { 0, 1, 1, 1, 1, 1, 1, 0 }, // = Digit 0
  { 0, 1, 0, 0, 1, 0,  0, 0 }, // = Digit 1
  { 0, 0, 1, 1, 1, 1, 0, 1 }, // = Digit 2
  { 0, 1,  1, 0, 1, 1, 0, 1 }, // = Digit 3
  { 0, 1, 0, 0, 1, 0, 1, 1 }, // = Digit 4
  { 0, 1, 1, 0, 0, 1, 1, 1 }, // = Digit 5
  { 0, 1, 1, 1, 0, 1, 1, 1 }, // =  Digit 6
  { 0, 1, 0, 0, 1, 1, 0, 0 }, // = Digit 7
  { 0, 1, 1, 1, 1, 1, 1,  1 }, // = Digit 8
  { 0, 1, 1, 0, 1, 1, 1, 1 }  // = Digit 9
};

void  setup() {

  //PinMode of display pins
  for (int i = 2; i < 9; i++)
  {
    pinMode(i, OUTPUT);
  }
  //PinMode of leds pins
  for (int  i = A0; i < A5; i++)
  {
    pinMode(i, OUTPUT);
  }
  ////PinMode of  pusbutton pin
  pinMode(botao, INPUT);
  t_0 = millis();
}

void  loop() {

  //Show the S of stop at the beginning
  number_display(5);

  //conting the minimum time that the traffic light will be green for the cars
  t_1 = millis();
  if (t_1 - t_0 < t) {
    safe_time = t_1 - t_0;
  }

  //green sign for cars and red for pedestrians
  digitalWrite(sinal_carros[2],  HIGH);
  digitalWrite(sinal_pedestre[0], HIGH);
  //while no one makes a request,  the signal will not change.
  if (digitalRead(botao) == HIGH)
  {

    delay(8000 - safe_time);

    //red light for cars goes out and yellow  turns on for 2.5 seconds
    digitalWrite(sinal_carros[2], LOW);
    digitalWrite(sinal_carros[1],  HIGH);

    delay(2500);

    //Pedestrians sign opens
    digitalWrite(sinal_carros[1],  LOW);
    digitalWrite(sinal_carros[0], HIGH);
    digitalWrite(sinal_pedestre[0],  LOW);
    digitalWrite(sinal_pedestre[1], HIGH);

    //Countdown to the  pedestrian signal close
    t_0 = millis();
    t_aux = 0;
    while (t_aux  < 5000) {
      idle_display();
      t_aux = millis() - t_0;
    }

    for (int k = 9; k > 0; k--) {
      number_display(k);

      delay(1000);
    }
    //the signals are turned off for the cycle to start again
    digitalWrite(sinal_carros[0],  LOW);
    digitalWrite(sinal_pedestre[1], LOW);

    t_0 = millis();
  }

}
//function that shows a number in the 7 segment display

void  number_display(int m) {

  for (int j = 2; j < 9; j++) {
    digitalWrite(j,  disp[m][j - 1]);
  }

}

void idle_display() {
  turnOf_display();
  digitalWrite(3, 1);
  delay(150);
  digitalWrite(3, 0);
  digitalWrite(8,  1);
  delay(150);
  digitalWrite(8, 0);
  digitalWrite(6, 1);
  delay(150);
  digitalWrite(6, 0);
  delay(150);

}

void turnOf_display() {
  for (int i = 2; i < 9; i++) {
    digitalWrite(i, 0);
  }
}

Arduino Pedestrian Traffic Lights Code

arduino

1//leds for both traffic lights
2int sinal_pedestre[2] = {A1, A0};
3int
4  sinal_carros[3] = {A2, A3, A4};
5//pushbuttonpin
6byte botao = 12;
7//auxiliar
8  time variables
9unsigned long t_0;
10unsigned long t_1;
11unsigned long t_aux;
12unsigned
13  int safe_time;
14//Waiting time for a request just after the traffic lights of
15  the cars open
16unsigned int t = 4000;
17
18//matrix of the display of 7 segments
19int
20  disp[10][8] = { { 0, 1, 1, 1, 1, 1, 1, 0 }, // = Digit 0
21  { 0, 1, 0, 0, 1, 0,
22  0, 0 }, // = Digit 1
23  { 0, 0, 1, 1, 1, 1, 0, 1 }, // = Digit 2
24  { 0, 1,
25  1, 0, 1, 1, 0, 1 }, // = Digit 3
26  { 0, 1, 0, 0, 1, 0, 1, 1 }, // = Digit 4
27
28  { 0, 1, 1, 0, 0, 1, 1, 1 }, // = Digit 5
29  { 0, 1, 1, 1, 0, 1, 1, 1 }, // =
30  Digit 6
31  { 0, 1, 0, 0, 1, 1, 0, 0 }, // = Digit 7
32  { 0, 1, 1, 1, 1, 1, 1,
33  1 }, // = Digit 8
34  { 0, 1, 1, 0, 1, 1, 1, 1 }  // = Digit 9
35};
36
37void
38  setup() {
39
40  //PinMode of display pins
41  for (int i = 2; i < 9; i++)
42
43  {
44    pinMode(i, OUTPUT);
45  }
46  //PinMode of leds pins
47  for (int
48  i = A0; i < A5; i++)
49  {
50    pinMode(i, OUTPUT);
51  }
52  ////PinMode of
53  pusbutton pin
54  pinMode(botao, INPUT);
55  t_0 = millis();
56}
57
58void
59  loop() {
60
61  //Show the S of stop at the beginning
62  number_display(5);
63
64
65  //conting the minimum time that the traffic light will be green for the cars
66
67  t_1 = millis();
68  if (t_1 - t_0 < t) {
69    safe_time = t_1 - t_0;
70  }
71
72
73  //green sign for cars and red for pedestrians
74  digitalWrite(sinal_carros[2],
75  HIGH);
76  digitalWrite(sinal_pedestre[0], HIGH);
77  //while no one makes a request,
78  the signal will not change.
79  if (digitalRead(botao) == HIGH)
80  {
81
82
83    delay(8000 - safe_time);
84
85    //red light for cars goes out and yellow
86  turns on for 2.5 seconds
87    digitalWrite(sinal_carros[2], LOW);
88    digitalWrite(sinal_carros[1],
89  HIGH);
90
91    delay(2500);
92
93    //Pedestrians sign opens
94    digitalWrite(sinal_carros[1],
95  LOW);
96    digitalWrite(sinal_carros[0], HIGH);
97    digitalWrite(sinal_pedestre[0],
98  LOW);
99    digitalWrite(sinal_pedestre[1], HIGH);
100
101    //Countdown to the
102  pedestrian signal close
103    t_0 = millis();
104    t_aux = 0;
105    while (t_aux
106  < 5000) {
107      idle_display();
108      t_aux = millis() - t_0;
109    }
110
111
112    for (int k = 9; k > 0; k--) {
113      number_display(k);
114
115      delay(1000);
116
117    }
118    //the signals are turned off for the cycle to start again
119    digitalWrite(sinal_carros[0],
120  LOW);
121    digitalWrite(sinal_pedestre[1], LOW);
122
123    t_0 = millis();
124
125  }
126
127}
128//function that shows a number in the 7 segment display
129
130void
131  number_display(int m) {
132
133  for (int j = 2; j < 9; j++) {
134    digitalWrite(j,
135  disp[m][j - 1]);
136  }
137
138}
139
140void idle_display() {
141  turnOf_display();
142
143  digitalWrite(3, 1);
144  delay(150);
145  digitalWrite(3, 0);
146  digitalWrite(8,
147  1);
148  delay(150);
149  digitalWrite(8, 0);
150  digitalWrite(6, 1);
151  delay(150);
152
153  digitalWrite(6, 0);
154  delay(150);
155
156}
157
158void turnOf_display() {
159
160  for (int i = 2; i < 9; i++) {
161    digitalWrite(i, 0);
162  }
163}
164

//leds for both traffic lights
int sinal_pedestre[2] = {A1, A0};
int
  sinal_carros[3] = {A2, A3, A4};
//pushbuttonpin
byte botao = 12;
//auxiliar
  time variables
unsigned long t_0;
unsigned long t_1;
unsigned long t_aux;
unsigned
  int safe_time;
//Waiting time for a request just after the traffic lights of
  the cars open
unsigned int t = 4000;

//matrix of the display of 7 segments
int
  disp[10][8] = { { 0, 1, 1, 1, 1, 1, 1, 0 }, // = Digit 0
  { 0, 1, 0, 0, 1, 0,
  0, 0 }, // = Digit 1
  { 0, 0, 1, 1, 1, 1, 0, 1 }, // = Digit 2
  { 0, 1,
  1, 0, 1, 1, 0, 1 }, // = Digit 3
  { 0, 1, 0, 0, 1, 0, 1, 1 }, // = Digit 4

  { 0, 1, 1, 0, 0, 1, 1, 1 }, // = Digit 5
  { 0, 1, 1, 1, 0, 1, 1, 1 }, // =
  Digit 6
  { 0, 1, 0, 0, 1, 1, 0, 0 }, // = Digit 7
  { 0, 1, 1, 1, 1, 1, 1,
  1 }, // = Digit 8
  { 0, 1, 1, 0, 1, 1, 1, 1 }  // = Digit 9
};

void
  setup() {

  //PinMode of display pins
  for (int i = 2; i < 9; i++)

  {
    pinMode(i, OUTPUT);
  }
  //PinMode of leds pins
  for (int
  i = A0; i < A5; i++)
  {
    pinMode(i, OUTPUT);
  }
  ////PinMode of
  pusbutton pin
  pinMode(botao, INPUT);
  t_0 = millis();
}

void
  loop() {

  //Show the S of stop at the beginning
  number_display(5);


  //conting the minimum time that the traffic light will be green for the cars

  t_1 = millis();
  if (t_1 - t_0 < t) {
    safe_time = t_1 - t_0;
  }


  //green sign for cars and red for pedestrians
  digitalWrite(sinal_carros[2],
  HIGH);
  digitalWrite(sinal_pedestre[0], HIGH);
  //while no one makes a request,
  the signal will not change.
  if (digitalRead(botao) == HIGH)
  {


    delay(8000 - safe_time);

    //red light for cars goes out and yellow
  turns on for 2.5 seconds
    digitalWrite(sinal_carros[2], LOW);
    digitalWrite(sinal_carros[1],
  HIGH);

    delay(2500);

    //Pedestrians sign opens
    digitalWrite(sinal_carros[1],
  LOW);
    digitalWrite(sinal_carros[0], HIGH);
    digitalWrite(sinal_pedestre[0],
  LOW);
    digitalWrite(sinal_pedestre[1], HIGH);

    //Countdown to the
  pedestrian signal close
    t_0 = millis();
    t_aux = 0;
    while (t_aux
  < 5000) {
      idle_display();
      t_aux = millis() - t_0;
    }


    for (int k = 9; k > 0; k--) {
      number_display(k);

      delay(1000);

    }
    //the signals are turned off for the cycle to start again
    digitalWrite(sinal_carros[0],
  LOW);
    digitalWrite(sinal_pedestre[1], LOW);

    t_0 = millis();

  }

}
//function that shows a number in the 7 segment display

void
  number_display(int m) {

  for (int j = 2; j < 9; j++) {
    digitalWrite(j,
  disp[m][j - 1]);
  }

}

void idle_display() {
  turnOf_display();

  digitalWrite(3, 1);
  delay(150);
  digitalWrite(3, 0);
  digitalWrite(8,
  1);
  delay(150);
  digitalWrite(8, 0);
  digitalWrite(6, 1);
  delay(150);

  digitalWrite(6, 0);
  delay(150);

}

void turnOf_display() {

  for (int i = 2; i < 9; i++) {
    digitalWrite(i, 0);
  }
}

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