Add Ultrasonic (HC-SR04) code

Ultrasonic/Ultrasonic.arduino.avr.uno.hex

@@ -0,0 +1,187 @@
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+:00000001FF

Ultrasonic/Ultrasonic.ino

@@ -0,0 +1,47 @@
+// Ultrasonic sensor
+#include <SR04.h>
+
+#define red 3
+#define yellow 4
+#define green 5
+#define echo 9
+#define trig 8
+SR04 sr04 = SR04(echo, trig);
+long length;
+
+void turnOff() {
+  digitalWrite(red, LOW);
+  digitalWrite(yellow, LOW);
+  digitalWrite(green, LOW);
+}
+
+void turnOn(int LED) {
+  turnOff();
+  digitalWrite(LED, LOW);
+}
+
+void setup(){
+  Serial.begin(9600);
+  pinMode(red, OUTPUT);
+  pinMode(yellow, OUTPUT);
+  pinMode(green, OUTPUT);
+  pinMode(echo, INPUT);
+  pinMode(trig, OUTPUT);
+}
+
+void loop() {
+  length = sr04.Distance();
+  Serial.println("Distancia: ");
+  Serial.println(length);
+  Serial.println("cm");
+
+  if(length < 8){
+    turnOn(red);
+  } else if (length < 15){
+    turnOn(yellow);
+  } else {
+    turnOn(green);
+  }
+
+  delay(100);
+}