diff --git a/Helen_Single_HC-SR04/Helen_Single_HC-SR04.ino b/Helen_Single_HC-SR04/Helen_Single_HC-SR04.ino
new file mode 100644
index 0000000..b80b24f
--- /dev/null
+++ b/Helen_Single_HC-SR04/Helen_Single_HC-SR04.ino
@@ -0,0 +1,148 @@
+/*   -*- Helen Souce code -*-
+ *
+ * The project type is "Single HC-SR04", the
+ * we recomend you read the tutorial in official
+ * repository after upload the code.
+ *
+ * This is the source code of Helen project
+ * you are free to edit anything in this code.
+ *
+ * Warning: If you want to change something in
+ * the code, please read the comments to avoid
+ * errors.
+ *
+ * Repository:    https://github.com/Samuel-de-Oliveira/Helen
+ * License:       MIT
+ * Created by:    Samuel de Oliveira (Github: Samuel-de-Oliveira)
+ * Contribuitors: Nobody
+ * Version:       1.0
+ *
+ */
+
+
+// ----- *X* ----- //
+
+
+/*   -*- Includes -*-
+/* * ------------------ * */
+#include <Ultrasonic.h>
+#include "buzzerSound.h"
+#include "tools.h"
+/* * ------------------ * */
+
+/*   -*- Pins -*-
+/* * -------------------- * */
+const char triggerPin   {6};
+const char echoPin      {5};
+const char vibrationPin {10};
+const char buzzerPin    {9};
+/* * -------------------- * */
+
+/*   -*- Constants -*-
+ *    
+ * This is all the constants you can change.
+ * Change based in your needs.
+ * 
+ * For more info about these constants:
+ * https://github.com/Samuel-de-Oliveira/Helen.
+ *  
+/* * --------------------------------- * */
+const byte Measure      {CM};
+const byte farDistance  {60};
+const byte Distance     {45};
+const byte nearDistance {20};
+/* * --------------------------------- * */
+
+
+// ----- *X* ----- //
+
+
+/*   -*- Start the sensor -*-
+/* * -------------------------------- * */
+Ultrasonic Sensor(triggerPin, echoPin);
+/* * -------------------------------- * */
+
+void setup() {
+  
+  /*
+     Here is the buzzer and vibraton set.
+     To check or change all sounds and
+     vibration control, check the buzzerSound.h
+
+     NOTE: Some beeps should be annoying, so if
+     don't like the sound you can change in
+     buzzerSound file.
+  */
+  pinMode(vibrationPin, OUTPUT);
+  pinMode(buzzerPin, OUTPUT);
+
+
+  /*   -*- Begin Serial monitor and show a message -*-
+   * 
+   * Here will Only show the start message and
+   * nothing special than this.
+   *
+  /* * ------------------------------------------------------------------------------------- * */
+  Serial.begin(9600);
+  Serial.println("The monitor serial is only to see if the components is working correctly");
+  Serial.println("else this don't have anything more to see here.");
+  delay(1000);
+  /* * ------------------------------------------------------------------------------------- * */
+  
+}
+
+void loop() {
+
+  /*
+   *  The code is very simple. The "Sentor.read" check the
+   *  distance based in the measure you've seted before.
+   *  
+   *  And will comparate the distance of Sensor.read with
+   *  "farDistance", "Distance" and "nearDistance".
+   */
+
+  if ( Sensor.read(Measure) == 0 ) {
+
+    /*   -*- Show the error messase -*-
+     *    
+     * If the sensor is not working or is
+     * disconnected this message will be showed.   
+     *
+    /* * ---------------------------------------------------------------------------- * */
+    Serial.println("Oh no, something went wrong!");
+    Serial.println("Please check this link: https://github.com/Samuel-de-Oliveira/Helen");
+    Serial.println("For more info about this error.");
+    
+    warningBeep(buzzerPin, vibrationPin);
+    /* * ---------------------------------------------------------------------------- * */
+    
+  } else if ( Sensor.read(Measure) <= nearDistance ) {
+
+    /*   -*- Fast beep -*-
+    /* * ------------------------------------------- * */
+    showDistance(Sensor);
+    Serial.println("I've found something near me!");
+    fastBeep(buzzerPin, vibrationPin);
+    /* * ------------------------------------------- * */
+    
+  } else if ( Sensor.read(Measure) <= Distance ) {
+
+    /*   -*- Slow beep -*-
+    /* * ------------------------------------------- * */
+    showDistance(Sensor);
+    Serial.println("I've found something distant me!");
+    slowBeep(buzzerPin, vibrationPin);
+    /* * ------------------------------------------- * */
+    
+  } else if ( Sensor.read(Measure) <= farDistance ) {
+
+    /*   -*- Very slow beep -*-
+    /* * ------------------------------------------- * */
+    showDistance(Sensor);
+    Serial.println("I've found something very distant me!");
+    verySlowBeep(buzzerPin, vibrationPin);
+    /* * ------------------------------------------- * */
+    
+  }
+
+}