Comments
Login to post a comment...
Traffic Light
In this project, both the car and pedestrian traffic lights go through their normal cycle until the button is pressed by a pedestrian, which then causes the lights to change in favor of the pedestrian.
|
Connect one leg of the pushbutton to 5 volts and the other to digital pin 2 and a 10kΩ pull-down resistor. Use 220 Ohm resistors to connect the LEDs to pins 8-12. |
Images
FilesLinks |
kennyz # July 20, 2010, 8:09 a.m.
// code for traffic light const int BTN_PIN = 2; const int TRAFFIC_RED_PIN = 12; const int TRAFFIC_YELLOW_PIN = 11; const int TRAFFIC_GREEN_PIN = 10; const int PEDESTRIAN_RED_PIN = 9; const int PEDESTRIAN_GREEN_PIN = 8; int ledPin[]={ TRAFFIC_RED_PIN, TRAFFIC_YELLOW_PIN, TRAFFIC_GREEN_PIN, PEDESTRIAN_RED_PIN, PEDESTRIAN_GREEN_PIN, }; int length = sizeof ledPin/sizeof *ledPin; void setup() { for(int i=0;i<length;i++) pinMode(ledPin[i], OUTPUT); pinMode(BTN_PIN,INPUT); } void loop() { //int switchValue = digitalRead(2); haltTraffic(); delay(10000); changeGreen(); for(int i=0;i<50;i++){ if(digitalRead(BTN_PIN)==HIGH) break; delay(400); } } void haltTraffic(){ changeRed(); digitalWrite(TRAFFIC_RED_PIN, HIGH); delay(1000); digitalWrite(PEDESTRIAN_RED_PIN, LOW); digitalWrite(PEDESTRIAN_GREEN_PIN, HIGH); } void changeRed(){ // private digitalWrite(TRAFFIC_GREEN_PIN, LOW); digitalWrite(TRAFFIC_YELLOW_PIN, HIGH); delay(5000); digitalWrite(TRAFFIC_YELLOW_PIN, LOW); } void changeGreen(){ digitalWrite(PEDESTRIAN_GREEN_PIN, LOW); for(int i=0;i<10;i++){ digitalWrite(PEDESTRIAN_RED_PIN, LOW); delay(500); digitalWrite(PEDESTRIAN_RED_PIN, HIGH); delay(500); } delay(1500); digitalWrite(TRAFFIC_RED_PIN, LOW); digitalWrite(TRAFFIC_GREEN_PIN, HIGH); }