Initial commit

README.md

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+# traffic-crossing

Traffic_Light_Crossing.ino

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+int btnPin = 9;
+int redRelayPin = 2;
+int grnRelayPin = 3;
+int spkPin = 8;
+int tones[] = {
+  3465, 2850, 2333, 1956, 1638, 1380, 1161, 992, 814, 704, 500
+}; 
+
+void redLightOn() {
+  digitalWrite(redRelayPin, LOW);  // turn relay ON
+}
+void redLightOff() {
+  digitalWrite(redRelayPin, HIGH);  // turn relay OFF
+}
+void greenLightOn() {
+  digitalWrite(grnRelayPin, LOW);  // turn relay ON
+}
+void greenLightOff() {
+  digitalWrite(grnRelayPin, HIGH);  // turn relay OFF
+}
+bool hasButtonBeenPushed() {
+  if (digitalRead(btnPin) == LOW) {
+    // debounce
+    delay(50);
+    if (digitalRead(btnPin) == LOW) {
+      return true;
+    }
+  }
+  return false;
+}
+
+void playIdle() {
+  tone(spkPin, 973, 25);
+  delay(25);
+  noTone(spkPin);
+}
+void playChirp() {
+  // Iterate through all tones
+  for (int i = 0; i < 11; i++) {
+    // Play the next tone
+    tone(spkPin, tones[i], 11);
+    delay(11);
+  }
+}
+void playWoodpecker() {
+  // 17x = 2secs; 85x = 10 seconds
+  for (int i = 0; i <= 85; i++) {
+    tone(spkPin, 500, 30);
+    delay(30);
+    noTone(spkPin);
+    delay(117); // wait
+  }
+}
+
+// Start Flashing Red Light w/ Idle sound for 5 cycles
+void doEndFlashing() {
+
+  // Lights off
+  greenLightOff();
+  redLightOff();
+
+  // Cycle Red w/ Idle sound x 5
+  for (int i = 0; i < 5; i++) {
+    redLightOn();
+    playIdle();
+    delay(600);
+    redLightOff();
+    delay(600);
+  }
+}
+
+void doTrafficLightCrossing() {
+
+  // Red Light On
+  greenLightOff();
+  redLightOn();
+
+  // Idle Tone x 4
+  playIdle();
+  delay(1800);
+  playIdle();
+  delay(1800);
+  playIdle();
+  delay(1800);
+  playIdle();
+  delay(1800);
+
+  // GO!
+  redLightOff();
+  greenLightOn();
+  playChirp();
+
+  // Woodpecker for 10 seconds
+  playWoodpecker();
+
+  doEndFlashing();
+
+  // Red light goes back on
+  redLightOn();
+
+  // Idle sound x 3
+  playIdle();
+  delay(1800);
+  playIdle();
+  delay(1800);
+  playIdle();
+}
+
+void setup() {
+  // Setup pins
+  pinMode(redRelayPin, OUTPUT);
+  pinMode(grnRelayPin, OUTPUT);
+  pinMode(spkPin, OUTPUT);
+  pinMode(btnPin, INPUT);
+}
+
+void loop() {
+
+  // Wait for button...
+  if (hasButtonBeenPushed() == true) {
+
+    // Run main program
+    doTrafficLightCrossing();
+  }
+
+  // Pause for 5ms
+  delay(5); 
+}