1 files changed, 54 insertions, 0 deletions
diff --git a/monophon/monophon.ino b/monophon/monophon.ino
new file mode 100644
index 0000000..1643bd4
--- /dev/null
+++ b/monophon/monophon.ino
@@ -0,0 +1,54 @@
+// play monophon sounds on the tesla coil
+//
+// receives uint16s from serial which specify the tone length in microseconds (1000000/440 is an "a" etc)
+
+
+int pin1 = 4;
+int pin2 = 5;
+unsigned int tonelength = 0;
+float high_factor = .2;
+
+void setup () {
+  pinMode(pin1, OUTPUT);
+  pinMode(pin2, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  while ( true ) {
+  if ( Serial.available() > 1 ) {
+    tonelength = Serial.read() << 8;
+    tonelength |= Serial.read();
+    Serial.print("New tonelength: ");
+    Serial.println(tonelength);
+  }
+  if ( tonelength == 0 )
+    delayMicroseconds(10);
+  else
+    beep(tonelength);
+  }
+}
+
+void beep(long usecs) {
+  high();
+  delayMicroseconds(usecs*high_factor);
+//  delayMicroseconds(usecs*on_percentage/100);
+  low();
+  delayMicroseconds(usecs*(1-high_factor));
+//  delayMicroseconds(usecs*(100-on_percentage)/100);
+}
+
+void high() {
+  digitalWrite(pin1, HIGH);
+  digitalWrite(pin2, HIGH);
+}
+
+void low() {
+  digitalWrite(pin1, LOW);
+  digitalWrite(pin2, LOW);
+}
+
+long freq (double f) {
+  // convert frequency to tonelength
+  return 1000000/f;
+}