Linear Signal Generator Working

Theremin/Theremin.ino

@@ -8,6 +8,10 @@ void setup() {
     pinMode(0, INPUT_PULLUP);
     pinMode (13, OUTPUT);
   pinMode(8, OUTPUT);
+    Serial.begin (9600);        //set up a serial connection with the computer
+
+  pinMode(11, OUTPUT);   //the trigger pin 
+  pinMode(12, INPUT);    //echo pin
   if (digitalRead(0) ==HIGH){
     mode = 0;
   }
@@ -19,6 +23,25 @@ void setup() {
 void loop() {
   if (mode == 0){
     digitalWrite(13, HIGH);
-    tone(8, 440);cd 
+    tone(8, getNote()); 
   }
 }
+float getNote()
+{
+  float echoTime;
+  float calculatedDistance;
+  digitalWrite(11, HIGH);
+  delayMicroseconds(20); 
+  digitalWrite(11, LOW);
+
+  echoTime = pulseIn(12, HIGH);                                       
+  calculatedDistance = echoTime / 8; 
+  calculatedDistance += 110;
+  if (calculatedDistance > 1720){
+
+    calculatedDistance = 880;
+  }
+   Serial.print(calculatedDistance);      //print units after the distance
+    Serial.println(" hz");      //print units after the distance
+  return calculatedDistance;
+}

Theremin/Theremin/Theremin.ino

@@ -0,0 +1,45 @@
+/*
+ *@author James McKenzie
+ *@lang C89 Based
+ *@contact lunarised@outlook.com
+ */
+ int mode;
+void setup() {
+    pinMode(0, INPUT_PULLUP);
+    pinMode (13, OUTPUT);
+  pinMode(8, OUTPUT);
+    Serial.begin (9600);        //set up a serial connection with the computer
+
+  pinMode(11, OUTPUT);   //the trigger pin 
+  pinMode(12, INPUT);    //echo pin
+  if (digitalRead(0) ==HIGH){
+    mode = 0;
+    mode = 1;
+  }
+}
+
+void loop() {
+  if (mode == 0){
+    digitalWrite(13, HIGH);
+    tone(8, getNote()); 
+  }
+}
+float getNote()
+{
+  float echoTime;
+  float calculatedDistance;
+  digitalWrite(11, HIGH);
+  delayMicroseconds(20); 
+  digitalWrite(11, LOW);
+
+  echoTime = pulseIn(12, HIGH);                                       
+  calculatedDistance = echoTime / 8; 
+  calculatedDistance += 110;
+  if (calculatedDistance > 1760){ //
+
+    calculatedDistance = 1760;
+  }
+   Serial.print(calculatedDistance);      //print units after the distance
+    Serial.println(" hz");      //print units after the distance
+  return calculatedDistance;
+}