SparkFun - Traffic Light with Crossing

This is a circuit that simulates a traffic light with a crosswalk button

May 1, 2022

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Devices & Components

SparkFun RedBoard

Resistor 330 ohm

5 mm LED: Red

Push Button

5 mm LED: Green

Jumper wires (generic)

Solderless Breadboard Half Size

5 mm LED: Yellow

Software & Tools

Arduino IDE

Project description

Code

arduino

The code

1int button = 7;
2int buttonState = 0;
3int red = 3;
4int yellow   = 4;
5int green = 5;
6
7void setup() {
8
9    pinMode(red, OUTPUT); //   red led
10    pinMode(yellow, OUTPUT); // yellow led
11    pinMode(green, OUTPUT);   // green led
12    pinMode(button, INPUT); // button
13    
14}
15
16
17
18//   Main/Loop Function
19void loop(){
20 if (digitalRead(button) == HIGH){
21        if   (digitalRead(button) == HIGH) {
22            // if the button pressed, stop traffic
23             lightCycle();
24        }
25 }
26    else { // If the button is off,   traffic goes on
27      digitalWrite(green, HIGH);
28      digitalWrite(yellow,   LOW);
29      digitalWrite(red, LOW);
30    }
31 }
32 
33
34void lightCycle(){
35   
36  // Turns green off, Yellow on 
37  delay(2000);
38  digitalWrite(green,   LOW);
39  digitalWrite(yellow, HIGH);
40  digitalWrite(red, LOW);
41  delay(3000);
42
43
44   // Turns yellow off, Red on
45  digitalWrite(green, LOW);
46  digitalWrite(yellow,   LOW);
47  digitalWrite(red, HIGH);
48  delay(8000);
49}

int button = 7;
int buttonState = 0;
int red = 3;
int yellow   = 4;
int green = 5;

void setup() {

    pinMode(red, OUTPUT); //   red led
    pinMode(yellow, OUTPUT); // yellow led
    pinMode(green, OUTPUT);   // green led
    pinMode(button, INPUT); // button
    
}



//   Main/Loop Function
void loop(){
 if (digitalRead(button) == HIGH){
        if   (digitalRead(button) == HIGH) {
            // if the button pressed, stop traffic
             lightCycle();
        }
 }
    else { // If the button is off,   traffic goes on
      digitalWrite(green, HIGH);
      digitalWrite(yellow,   LOW);
      digitalWrite(red, LOW);
    }
 }
 

void lightCycle(){
   
  // Turns green off, Yellow on 
  delay(2000);
  digitalWrite(green,   LOW);
  digitalWrite(yellow, HIGH);
  digitalWrite(red, LOW);
  delay(3000);


   // Turns yellow off, Red on
  digitalWrite(green, LOW);
  digitalWrite(yellow,   LOW);
  digitalWrite(red, HIGH);
  delay(8000);
}

Code

arduino

The code

1int button = 7;
2int buttonState = 0;
3int red = 3;
4int yellow  = 4;
5int green = 5;
6
7void setup() {
8
9    pinMode(red, OUTPUT); //  red led
10    pinMode(yellow, OUTPUT); // yellow led
11    pinMode(green, OUTPUT);  // green led
12    pinMode(button, INPUT); // button
13    
14}
15
16
17
18//  Main/Loop Function
19void loop(){
20 if (digitalRead(button) == HIGH){
21        if  (digitalRead(button) == HIGH) {
22            // if the button pressed, stop traffic
23            lightCycle();
24        }
25 }
26    else { // If the button is off,  traffic goes on
27      digitalWrite(green, HIGH);
28      digitalWrite(yellow,  LOW);
29      digitalWrite(red, LOW);
30    }
31 }
32 
33
34void lightCycle(){
35  
36  // Turns green off, Yellow on 
37  delay(2000);
38  digitalWrite(green,  LOW);
39  digitalWrite(yellow, HIGH);
40  digitalWrite(red, LOW);
41  delay(3000);
42
43
44  // Turns yellow off, Red on
45  digitalWrite(green, LOW);
46  digitalWrite(yellow,  LOW);
47  digitalWrite(red, HIGH);
48  delay(8000);
49}

int button = 7;
int buttonState = 0;
int red = 3;
int yellow  = 4;
int green = 5;

void setup() {

    pinMode(red, OUTPUT); //  red led
    pinMode(yellow, OUTPUT); // yellow led
    pinMode(green, OUTPUT);  // green led
    pinMode(button, INPUT); // button
    
}



//  Main/Loop Function
void loop(){
 if (digitalRead(button) == HIGH){
        if  (digitalRead(button) == HIGH) {
            // if the button pressed, stop traffic
            lightCycle();
        }
 }
    else { // If the button is off,  traffic goes on
      digitalWrite(green, HIGH);
      digitalWrite(yellow,  LOW);
      digitalWrite(red, LOW);
    }
 }
 

void lightCycle(){
  
  // Turns green off, Yellow on 
  delay(2000);
  digitalWrite(green,  LOW);
  digitalWrite(yellow, HIGH);
  digitalWrite(red, LOW);
  delay(3000);


  // Turns yellow off, Red on
  digitalWrite(green, LOW);
  digitalWrite(yellow,  LOW);
  digitalWrite(red, HIGH);
  delay(8000);
}

Downloadable files

Traffic Light Schematic

The Schematic View by using Fritzing

Traffic Light Schematic

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tnguy146

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