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Author: nefelimet

Diff for: TrafficLight.ino

@@ -0,0 +1,44 @@
+//This uses a RGB Common Cathode LED, and an HC_SR04 ultrasonic sensor
+//The LED lights up in different colours, according to the distance of an object from the sensor
+
+#include <NewPing.h>
+NewPing sonar(12, 13, 200);
+
+void setup(){
+  Serial.begin(9600);
+  pinMode(11, OUTPUT);      //red
+  pinMode(10, OUTPUT);      //green
+  pinMode(9, OUTPUT);       //blue
+}
+
+void loop(){
+  int distance = sonar.ping_cm();
+  Serial.println(distance);
+
+  //if distance is up to 5 cm, the LED becomes red
+  if(distance <=5 && distance >0){
+    digitalWrite(11, HIGH);
+    digitalWrite(10, LOW);
+    digitalWrite(9, LOW);
+  }
+
+  //if distance is between 5 and 10 cm, the LED becomes blue
+  else if (distance > 5 && distance <= 10){
+    digitalWrite(11, LOW);
+    digitalWrite(10, LOW);
+    digitalWrite(9, HIGH);
+  }
+
+  //if distance if bigger than 10 cm, the LED becomes green
+  else if (distance >10){
+    digitalWrite(11, LOW);
+    digitalWrite(10, HIGH);
+    digitalWrite(9, LOW);
+  }
+  else{
+    digitalWrite(11, LOW);
+    digitalWrite(10, LOW);
+    digitalWrite(9, LOW);
+  }
+  delay(1000);
+}