This project is enhancements to the traditional Traffic lights and Pedestrian crossings such as the replacement of the pushbuttons to using a PIR motion sensor, a buzzer to signal the start of the Pedestrian crossing for pedestrians and a 7 segment display to display the count down of the pedestrian crossing.

Step 1: Component

1 Arduino Uno R3
3 Red LED
3 Green LED
2 Yellow LED
9 400 Ω Resistor
1 Piezo
1 PIR Sensor
1 Cathode 7 Segment Display
6 300 Ω Resistor
1 Breadboard Small

Step 2: Instruction

Step 3: Demonstration

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Step 4: Code

int LED_RED1 = 2; //Traffic Light 1
int LED_YELLOW1 = 3; 
int LED_GREEN1 = 4;

int LED_RED2 = 5; //Traffic Light 2
int LED_YELLOW2 = 6; 
int LED_GREEN2 = 7;

int LED_RED3 = 8; //Pedestrian Crossing Light
int LED_GREEN3 = 9; //Pedestrian Crossing Light

int sensor = 10; // The pin that the sensor is attached 
int state = LOW; // By default, no motion detected
int val = LOW; // Variable to store the sensor status

int timer = 10000;

unsigned const int a = 14;
unsigned const int b = 15; 
unsigned const int c = 16; 
unsigned const int d = 17; 
unsigned const int e = 11; 
unsigned const int f = 12; 
unsigned const int g = 13;
int COUNT;

int DELAY_GREEN = 5000;
int DELAY_RED = 5000;
int DELAY_YELLOW = 2500;

void setup()
{
  pinMode(2, OUTPUT); // Traffic Light 1 (RED)
  pinMode(3, OUTPUT); // Traffic Light 1 (YELLOW)
  pinMode(4, OUTPUT); // Traffic Light 1 (GREEN)
  pinMode(5, OUTPUT); // Traffic Light 1 (RED)
  pinMode(6, OUTPUT); // Traffic Light 1 (YELLOW)
  pinMode(7, OUTPUT); // Traffic Light 1 (GREEN)
  pinMode(8, OUTPUT); // Pedestrian Crossing Light(RED)
  pinMode(9, OUTPUT); // Pedestrian Crossing Light(GREEN)
  pinMode(LED_GREEN3, OUTPUT); 
  Serial.begin(9600);
  pinMode(timer,OUTPUT);
  
  pinMode(a, OUTPUT); 
  pinMode(b, OUTPUT); 
  pinMode(c, OUTPUT); 
  pinMode(d, OUTPUT); 
  pinMode(e, OUTPUT); 
  pinMode(f, OUTPUT); 
  pinMode(g, OUTPUT);
  
  analogReference (DEFAULT);
  
  pinMode(sensor, OUTPUT);
  digitalWrite(sensor, LOW);
  delayMicroseconds(2);
  digitalWrite(sensor, HIGH);
  delayMicroseconds(5);
  digitalWrite(sensor, LOW);
  pinMode(sensor, INPUT); 
  
}

void loop()
{
  if(digitalRead(sensor) == HIGH){
    delay(15); 
    if (digitalRead(sensor) == HIGH){
      state == HIGH; //Motion Detected
      
      changeLights();// function calling
      delay(1000); // wait 10 seconds before changing 
    }
  }
  
  if (digitalRead(sensor) == LOW){
    delay(15); 
    if (digitalRead(sensor) == LOW){
      state == LOW; // no motion detected 
     
      // FUNCTION CALLING
      green_light();
      delay(DELAY_GREEN);
      yellow_light();
      delay(DELAY_YELLOW);
      red_light();
      delay(DELAY_RED);
      }
  } 
}      
      
void display()
{
  delay(500);
  digitalWrite(LED_GREEN3, HIGH);
  //9
  digitalWrite(14, HIGH); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, LOW); //d
  digitalWrite(11, LOW); //e
  digitalWrite(12, HIGH); //f
  digitalWrite(13, HIGH); //g
  delay(500);
  
   //8
  digitalWrite(14, HIGH); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, HIGH); //d
  digitalWrite(11, HIGH); //e
  digitalWrite(12, HIGH); //f
  digitalWrite(13, HIGH); //g
  delay(500);
  
   //7
  digitalWrite(14, HIGH); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, LOW); //d
  digitalWrite(11, LOW); //e
  digitalWrite(12, LOW); //f
  digitalWrite(13, LOW); //g
  delay(500);
   
   //6
  digitalWrite(14, HIGH); //a
  digitalWrite(15, LOW); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, HIGH); //d
  digitalWrite(11, HIGH); //e
  digitalWrite(12, HIGH); //f
  digitalWrite(13, HIGH); //g
  delay(500);
  
    //5
  digitalWrite(14, HIGH); //a
  digitalWrite(15, LOW); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, HIGH); //d
  digitalWrite(11, LOW); //e
  digitalWrite(12, HIGH); //f
  digitalWrite(13, HIGH); //g
  delay(500);
  
    //4
  digitalWrite(14, LOW); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, LOW); //d
  digitalWrite(11, LOW); //e
  digitalWrite(12, HIGH); //f
  digitalWrite(13, HIGH); //g
  delay(500);
  
    //3
  digitalWrite(14, HIGH); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, HIGH); //d
  digitalWrite(11, LOW); //e
  digitalWrite(12, LOW); //f
  digitalWrite(13, HIGH); //g
  delay(500);
  
    //2
  digitalWrite(14, HIGH); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, LOW); //c
  digitalWrite(17, HIGH); //d
  digitalWrite(11, HIGH); //e
  digitalWrite(12, LOW); //f
  digitalWrite(13, HIGH); //g
  delay(500);
  
    //1
  digitalWrite(14, LOW); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, LOW); //d
  digitalWrite(11, LOW); //e
  digitalWrite(12, LOW); //f
  digitalWrite(13, LOW); //g
  delay(500);
  
    //0
  digitalWrite(14, HIGH); //a
  digitalWrite(15, HIGH); //b
  digitalWrite(16, HIGH); //c
  digitalWrite(17, HIGH); //d
  digitalWrite(11, HIGH); //e
  digitalWrite(12, HIGH); //f
  digitalWrite(13, LOW); //g
  delay(500);
  
    //off
  digitalWrite(14, LOW); //a
  digitalWrite(15, LOW); //b
  digitalWrite(16, LOW); //c
  digitalWrite(17, LOW); //d
  digitalWrite(11, LOW); //e
  digitalWrite(12, LOW); //f
  digitalWrite(13, LOW); //g
  digitalWrite(LED_GREEN3, LOW);
  delay(500);
  
}
          
void changeLights()
{
  //turn off TL 1&2 yellow, then turn on PL red for 5 seconds 
  //TL 1&2 Green + PL Green is off based off previous part
  digitalWrite(LED_YELLOW1, LOW); // TL 1 yellow off
  digitalWrite(LED_YELLOW2, LOW); // TL 2 yellow off
  digitalWrite(LED_RED1, HIGH); // TL1 red on
  digitalWrite(LED_RED2, HIGH); // TL2 red on
  digitalWrite(LED_RED3, HIGH); // PL red on
  digitalWrite(LED_GREEN3, HIGH); // PL  Green on
  digitalWrite(LED_GREEN2, LOW); // TL 2 Green off
  digitalWrite(LED_GREEN1, LOW); // TL1  Green off
  delay(1000);
 
  digitalWrite(LED_YELLOW1, LOW); // TL 1 yellow 
  digitalWrite(LED_YELLOW2, LOW); // TL 2 yellow 
  digitalWrite(LED_RED1, HIGH); // TL1 red 
  digitalWrite(LED_RED2, HIGH); // TL2 red 
  digitalWrite(LED_RED3, LOW); // PL red 
  digitalWrite(LED_GREEN3, LOW); // PL  Green 
  digitalWrite(LED_GREEN2, LOW); // TL 2 Green 
  digitalWrite(LED_GREEN1, LOW); // TL1  Green 
  delay(1000);
  display(); // 7 segment count down from 9 to 0
  delay(100);
  
}
          
void green_light()
{

 //
  digitalWrite(LED_GREEN1,HIGH); 
  digitalWrite(LED_RED1,LOW);
  digitalWrite(LED_YELLOW1, LOW); 
  
  digitalWrite(LED_GREEN2, HIGH);
  digitalWrite(LED_RED2, LOW); 
  digitalWrite(LED_YELLOW2, LOW); 
  
  digitalWrite(LED_GREEN3, LOW); 
  digitalWrite(LED_RED3, HIGH); 
}

void yellow_light()
{

 // 
  digitalWrite(LED_GREEN1,LOW); 
  digitalWrite(LED_RED1,LOW);
  digitalWrite(LED_YELLOW1, HIGH); 
  
  digitalWrite(LED_GREEN2, LOW);
  digitalWrite(LED_RED2, LOW); 
  digitalWrite(LED_YELLOW2, HIGH); 
  
  digitalWrite(LED_GREEN3, LOW); 
  digitalWrite(LED_RED3, HIGH); 
}
  
  
void red_light()
{

  digitalWrite(LED_GREEN1,LOW); 
  digitalWrite(LED_RED1,HIGH);
  digitalWrite(LED_YELLOW1, LOW); 
  
  digitalWrite(LED_GREEN2, LOW);
  digitalWrite(LED_RED2, HIGH); 
  digitalWrite(LED_YELLOW2, LOW); 
  
  digitalWrite(LED_GREEN3, LOW); 
  digitalWrite(LED_RED3, HIGH); 
}