initial commit

2 files changed, 141 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;
+}
diff --git a/rtttl.py b/rtttl.py
new file mode 100644
index 0000000..b0dcc05
--- /dev/null
+++ b/rtttl.py
@@ -0,0 +1,87 @@
+#!/usr/bin/python
+"""
+play a rtttl file by sending the tone lengths to the arduino
+"""
+from __future__ import division
+import re
+import serial
+import struct
+import sys
+import time
+
+BAUDRATE = 9600
+PAUSE = .001
+
+_rtttl_re = re.compile('([0-9]+)?([a-hp]#?)(\.?)([0-9]?)(?:(?:,[ \n]*|$))')
+_rtttl_prefix_re = re.compile('d=([0-9]+),o=([1-5]),b=([0-9]+)')
+
+freqs = {
+    'a':  440.000,
+    'a#': 466.164,
+    'b':  493.883,
+    'h':  493.883,
+    'c':  523.251,
+    'c#': 554.365,
+    'd':  587.330,
+    'd#': 622.254,
+    'e':  659.255,
+    'f':  698.456,
+    'f#': 739.989,
+    'g':  783.991,
+    'g#': 830.609,
+    'p':  0,
+}
+
+def parse(s):
+    name, prefix, music = s.split(':')
+    pm = _rtttl_prefix_re.match(prefix)
+    d, o, b = pm.groups()
+
+    defaultlength = int(d)
+    octave = int(o)
+    timefactor = int(b)/60
+
+    for m in _rtttl_re.finditer(music):
+        l, t, ld, o = m.groups()
+
+        if l:
+            length = 1/int(l)
+        else:
+            length = 1/defaultlength
+        if ld:
+            length = length * 1.5
+        length = length*timefactor
+        tone = freqs[t.lower()]
+        if o:
+            octave = o
+        tone = tone * 2**(int(octave) - 4)
+
+
+        yield (length, tone)
+
+def send(sounds, device):
+    with serial.Serial(device, BAUDRATE) as ser:
+        for length, freq in sounds:
+            sys.stderr.write('len: %.3f, ton: %9.3f, send: %d' % (length, freq, freq2t(freq)))
+            ser.write(struct.pack('>H', freq2t(freq)))
+            time.sleep(length)
+            sys.stderr.write('\n')
+            ser.write('\0\0')
+            time.sleep(PAUSE)
+        ser.write('\0\0')
+
+
+def freq2t(freq):
+    if freq == 0:
+        return 0
+    return 2000000/freq
+
+if __name__ == '__main__':
+    if len(sys.argv) > 1:
+        if sys.argv[1] == '-d':
+            for length, freq in parse(sys.stdin.read()):
+                print 'len: %.3f, ton: %9.3f' % (length, freq)
+        else:
+            send(parse(sys.stdin.read()), sys.argv[1])
+    else:
+        print >>sys.stderr, "Usage: %s -d|/dev/ttyUSBx" % sys.argv[0]